Cornerstone Protection IconCornerstone Protection

836 Euclid Avenue Suite 16, Lexington

5.0 37 reviews

  • Avatar Larry Barton ★★★★★ a month ago
    Amazing assistance provided by Shannon today on my security system. I’m so grateful for your prompt, efficient, professional, and courteous service. Put me down as a customer for life!
  • Avatar Megan Haller ★★★★★ 2 months ago
    One of the most painless experiences I've had. They came on time and was over the moon professional with still keeping a level of personability to it. The gentleman also went out of his way to say that my husband and Mines business … More was appreciated. Which is actually rare to be appreciated by such a great company. So thank you and we look forward to continuing services with this company.
  • Avatar Megan Magsam ★★★★★ 3 months ago
    I am so happy we decided to go with cornerstone. They were quick and efficient. Shannon and the installer we very friendly. We got a lot of equipment and it was still within our budget. 10/10 would definitely recommend! Thank you
  • Avatar Collins Youngblood ★★★★★ 2 weeks ago
    Love the customer service and Shanon and his team go above and beyond for my restaurant. Couldn't of asked for a better security system and level of service that his team provides.
  • Avatar kanu patel ★★★★★ 2 months ago
    I have been using Cornerstone Protection service for over 5 years and I'm really happy with the service and state-of-the-art equipments and it's futures are so much in advance and friendly, I highly recommend Cornerstone Protection … More Service any and all business that need a security protection days and nights specially after business hours(Cornerstone Protection is perfect solution for your business). Owner of Cornerstone Protection is proactive with their customers and their equipments. Good experienced with Cornerstone Protection!!!
    Kanu Patel
  • Avatar Liz Jones ★★★★ 8 months ago
    We had a very positive experience with Alissa as a tutor for our pod of 5th grade boys from January - June 2020. She cared a lot about the boys and worked hard to create meaningful activities for them. The pod experience was invaluable … More for all of our families during a difficult year and we were so grateful to have found this partnership! We also want to appreciate Craig for helping to match us with a tutor on very short notice after we had cycled through a few folks who were not able to see the commitment through. Thanks for sticking with us!
  • Avatar S CL ★★★★★ 11 months ago
    Dusty was the exact person we needed to help our child finish out the school year. So grateful to him for the way he steadily encouraged her and helped her stay on track and organized. He is flexible, responsive to our needs/schedule as … More a family, and a delight to be with. We are also thankful that Craig at Themba Tutors really "gets it" and partnered us with such a wonderful tutor who was a great fit for our girl.
  • Avatar Nicole May ★★★★★ 11 months ago
    My child worked with Gillian D virtually for math enrichment. She is an excellent teacher. She took time to understand my child's specific learning style and provided tools that would be engaging. She was kind and empathetic- really … More made it her goal to connect with my child and build trust and rapport. My child started the school year with confidence and without the typically "brain-drain" that occurs over the summer, thanks to Gillian.
  • Avatar Gillian Davidoff ★★★★★ 11 months ago
    I am going into my second year as a Themba tutor. I have met so many great individuals while working for this company. Craig and the rest of the Themba team do such an excellent job picking and choosing Themba tutors that suit each client's … More individual needs! I look forward to meeting new tutors and clients in the 2021-2022 school year!
  • Avatar carolina luttmann ★★★★★ 11 months ago
    Our son started in a new high school, 100% remote, and was really struggling with Latin and Physics. I found Themba Tudors online and had an initial call with Craig, who was very knowledgeable, responsive, and found 2 amazing tutors for … More us. Both the Latin and the physics tutors were fantastic, connected with my son really well and helped him go from 'failing' grade to 'honors'! I will for sure continue using (and recommending!) Themba Tutors. Thank you, C, K, and W!
  • Avatar Eric Fingerman ★★★★★ 10 months ago
    Brian is a fantastic executive functioning coach. Super helpful, flexible with hours, and tailored the experience to our needs.
  • Avatar Susan Wong ★★★★★ a year ago
    Giulia Mercuri is a great Italian tutor! She was very responsive and accessible. Giulia put a ton of effort into preparing for each session and really helped our son with test preparation and projects. We are grateful that she was able … More to help, especially since our son did not receive any live teaching during COVID. We are happy that she was referred to us!
  • Avatar Christine Gennetti ★★★★★ a year ago
    As an adult student diagnosed with a learning disability during grad school, I knew I needed help dealing with my Master's program's demanding workload. I was seriously considering dropping out when I was referred to Themba Tutors. … More I was paired up with a wonderful tutor, Julie, who was a total lifesaver. I learned many techniques that I can utilize in the future as I embark on the next phase of my career.
    I can wholeheartedly say after working with Themba for two years that I would not have finished my program without this organization. And I am so thankful I selected them.
  • Avatar Fabiola FITZPATRICK ★★★★★ 2 years ago
    We were introduced to a wonderful tutor: Mcedwyn. He and our son, a freshman in college, worked well together. As a result, our son’s grades significantly improved. The tutor taught our son subject content and various methods to effectively … More study for quizzes and exams. Our son was also taught time management and organization. My son’s experience with the tutor made the first year of college a less intimidating experience.
  • Avatar Jude Eugene ★★★★★ a year ago
    We have been with our tutor, Cailin Schiller, for two years, from 5th - 7th grade. She started as an executive functioning tutor with my daughter. From the start, she demonstrated a depth of expertise and a selective use of techniques skillfully … More adapted to my daughter’s ADHD and Math disability. Cailin made Math accessible and understandable to her in a way that even her teachers had not been able to do. She differentiated reading, writing and math tasks and assignments to tailor them to my daughter’s unique learning differences. Not only did it have an effect on her grades and her work efficiency, but she finally could do her work with less anxiety. Even my daughter’s teachers used Cailin’s guidance to modify their work with her. But most importantly, she became my daughter’s favorite resource. I can’t say how invaluable Cailin has been to my daughter’s progress and well-being. I’d recommend her a million times over. She is a gem.
  • Avatar Janice Eidus ★★★★★ a year ago
    Victoria is a superb tutor. She helped my high school age daughter with her writing. Victoria's skills as a tutor, as well as her sense of humor and her engaging personality went a long way with my daughter.
  • A Google User ★★★★★ 3 years ago
    I'm so glad we were referred to Themba Tutors. After a great initial conversation to learn our needs, we were connected with an excellent tutor, Felicia, who is helping our high school daughter learn better organizational and executive … More skills. Highly recommended.
  • Avatar Fara Jones ★★★★★ 3 years ago
    Themba Tutors provided a leaning specialist that was a perfect fit for my daughter. I told them what we were looking for and they delivered. Our tutor is responsive and flexible and makes it easy for my daughter to reach out to her own … More her own, which gives her an added sense of responsibility over her learning. As a therapist myself, I now regularly recommend Themba to my patients. A much needed and well provided service to the community!!
  • Avatar Frances Simpson ★★★★★ 3 years ago
    The tutors at Themba are fantastic! Caitlyn McNeill helped our son academically, but also with getting organized in every subject, which he so desperately needed. She offered great advice and useful strategies that helped our son become … More a more successful student. We are using Themba tutors again this year for our daughter. We're so happy to have been referred to them!
  • Avatar Mary Jean Babic ★★★★★ 3 years ago
    I'm so glad we were referred to Themba Tutors. After a great initial conversation to learn our needs, we were connected with an excellent tutor, Felicia, who is helping our high school daughter learn better organizational and executive … More skills. Highly recommended.
  • Avatar Nina Herman ★★★★★ 3 years ago
    We had a wonderful experience with our tutor Micaela. She helped our son not only academically but at every level. We will be forever grateful to have her in our lives.
  • Avatar Frances ★★★★★ 3 years ago
    The tutors at Themba are fantastic! Caitlyn McNeill helped our son academically, but also with getting organized in every subject, which he so desperately needed. She offered great advice and useful strategies that helped our son become … More a more successful student. We are using Themba tutors again this year for our daughter. We're so happy to have been referred to them!
  • Avatar Michael Birnbaum ★★★★★ 3 years ago
    Paul Smith at Themba has been an exceptional tutor for my son, both in terms of teaching the subject matter and teaching how best to approach the process of learning math and executing assignments. We feel very fortunate to be working with … More Paul.
  • Avatar Monica Alzate ★★★★★ 3 years ago
    We were very lucky to have found Edwouine Swift, my son's therapist through Themba Tutors. Thomas is 12 years old, and it is extremely difficult to get him to write. Edwouine just works her magic with him, he adores her and is so … More eager to follow her guidance. I have no doubt she will be a positive driving force in his academic future.

Top Math Tutor in New York City

Pre-Calculus Math Tutors


New York City (NYC) Manhattan Brooklyn Queens Staten Island Bronx Long Island (including the Hamptons) Westchester New Jersey (NJ) Connecticut (CT)
New York Pre-Calculus (1)
New York Pre-Calculus (1)



Undergraduate Degree in Secondary Education with a Concentration in Mathematics, Graduate Degree in Special Education


High School Mathematics Teacher Completing Master’s Thesis and transitioning into his Doctoral Research at Teachers College, Columbia University


Master of Philosophy and Doctor of Philosophy, Master of Educational Leadership


Master’s degree in Actuarial Science


Master’s Degree in Statistical Science


Master’s in Education, Bachelor’s in Secondary Math Education


Certified in Secondary Education Mathematics Grade 7-12


Masters in Math Education


Certified Math and Special Education Teacher, MS Math Education

**Guarantee: It’s critical that whoever receives our tutoring services connects with the specialist, the specialist has expertise in the area of need, and is available to travel to you. If you are not 100% satisfied with our services, such as precalculus tutors near me and trigonometry tutors near me; we are 100% committed to finding you the right professional.

What Is Pre-calculus?

What Is Pre-Calculus?


As its name suggests, pre-calculus is the math course taken by students in high school or college to prepare them for calculus. Instead of involving actual calculus concepts, pre-calculus focuses on algebra, trigonometry, math analysis, and analytical geometry. Delving deeper into these subjects is meant to prepare students for calculus and equips them with the foundational skills that the course requires. Learn how you would know if your child needs a math tutor.


Pre-Calculus and Trigonometry

Trigonometry is defined as the study of angles and triangles, including their dimensions and relationships. It is one of the main math courses that students take in high school and college. Because pre-calculus involves solving and graphing problems using standard trigonometry functions, such as sine and cosine, trigonometry is a pre-requisite for students who are about to take a pre-calculus course. During the course, students will also encounter additional topics like vector operations, sequences, and series.


Pre-Calculus and Algebra

Just like trigonometry, mastering algebraic concepts and skills is necessary when taking pre-calculus. In fact, many math teachers and experts would say that a firm grasp of algebra is the key to a student’s success in calculus. In pre-calculus, students will work on quadratic, exponential, polynomial, and logarithmic functions. Learning to graph functions is particularly important since graphs figure prominently throughout calculus. Likewise, pre-calculus also covers the domain and range of functions, together with finding the intervals over which a function increases or decreases and performing transformations on a function.

Here are some helpful lecture videos with hands-on, interactive problem solving for all areas of math for ages 10 and up to master essential skills.

Math _ Precalculus

Is Pre-Calculus Difficult to Learn?

A pre-calculus course in high school is not difficult. It is a more tedious version of algebra, where you deal with complex fractions and decimals and do more advanced factoring. You will learn new topics such as the long division of polynomials and the remainder theorem and limits. Here are 9 useful study techniques for excelling in Calculus.


But because pre-calculus studies concepts from algebra, trigonometry, and geometry, it can be overwhelming for students to master and memorize all the materials. It is even more challenging for students who do not have a strong understanding of the pre-requisite subjects. In fact, even though they are familiar with the concepts introduced in pre-calculus, they may still find it difficult to navigate, especially if they are not adequately prepared to tackle more complex content. Learn how to teach a child with math learning disabilities.


What Are the Prerequisites for Pre-Calculus? 

To take a pre-calculus class, students need to have studied the following concepts and skills that are divided into six categories.


Renaming Expressions

Base ten number system; arithmetic with decimals, fractions, signed numbers; set notation (interval, set-builder, union, intersection); basic vocabulary (e.g., the phrases “at least” and “at most,” nonnegative, integers, consecutive); percentages; unit conversion; scientific notation; factoring; radicals; exponent laws; polynomials; matrices; complex numbers; completing the square technique; long division of polynomials; and logarithms. 


 Solving equations and inequalities in one variable

Linear; quadratic; absolute value; exponential; logarithmic; radical; systems; rational; compound inequalities; and the zero factor law. Understand extraneous solutions and when they can arise. Be sure that you can distinguish between exact and approximate solutions. You should understand the relationship between the algebraic and graphical solutions of sentences. 


Graphing sentences in two variables

Familiarity with these “basic models”: y = x , y = x 2 , y = x 3 , y = |x| , y = √ x , y = 1 x , y = k , y = ln x (and other bases) , y = ex (and other bases). Be able to graph circles and lines. Be able to graph transformations of the “basic models” involving: horizontal and vertical translations, vertical scaling; reflection about the x-axis; absolute value transformation. Be able to handle compound sentences that use the mathematical words ‘and’ and ‘or.’


Basic Geometry Formulas

Perimeters of common figures, including the circumference of a circle. Also, know the following formulas: AREA: rectangle, triangle, circle, trapezoid VOLUME: right cylinder (with familiar base)



Function notation; domain and range; composition; piecewise-defined functions; quadratic (y = ax2 +bx+c and y = a(x−h) 2 +k forms); higher-order polynomial (relationship between the zeros and factors); exponential and logarithmic (allowable bases, shapes of graphs); rational (asymptotes, end behavior, puncture points); and periodic (sine and cosine). 


Calculator Skills

Key expressions using correct knowledge of the order of operations; store and recall named variables; use stored values in calculations. Graph functions: set the window; trace along a curve; find maxima/minima of graphs; find x-intercepts using the built-in calculator feature; use the table feature; use the Zoom In, Zoom Out, and Z-Box features; and find intersection points of graphs.


Can You Use Trigonometry/Geometry To Calculate The Unknown Angle?? #Math #Science #College #Highschool #NicholasGKK

♬ original sound - Nicholas_GKK

How Can Themba Tutors Help?

Mathematics is one of the subjects that we often hear students complain about. It is often a source of frustration and confusion for many, whether they are in high school or college. Pre-calculus can be particularly challenging because it requires mastery of previous math courses such as geometry, trigonometry, and algebra. When students don’t have the necessary foundational skills needed for pre-calculus, it is easy for them to fall behind when encountering new material that build on skills and knowledge they should have learned in previous math courses.


Fortunately, this does not mean students cannot get the help and support they need to succeed in pre-calculus. With the help of a pre-calculus tutor, your child can strengthen their underlying math skills and learn new pre-calculus concepts in a fun and engaging way and at their own pace. With private pre-calculus tutoring, your child will have enough time to explore new material, ask questions, and receive feedback and positive reinforcement. Having a private pre-calculus tutor will not only enable your child to gain mastery of the subject but also build their confidence once they see the results of their hard work. Here are the top 10 things to know when hiring your Calculus tutor.


At Themba Tutors, we tutor all math content (ages 10 and up). Our pre-calculus tutors hone  in on two important areas. We cannot stress the importance of having a strong mathematics foundation enough, so our private pre-calculus tutor will make sure to fill any gaps in your child’s skills and understanding of math concepts. Second, our pre-calculus tutors will ensure that your child is able to learn and master new material introduced by the school curriculum. This is to ensure that he or she is equipped and prepared to tackle tests, quizzes, and homework. Themba Tutors aims to maximize your child’s learning potential from a collaborative approach working with parents, teachers, and other professionals.

Tutoring, Coaching, Learning Specialists, Academic Tutors Services

We have expertise in:

Students of all ages receive one-on-one tutoring in all instructional materials, test preparation, and executive function coaching as required. At Themba Tutors, we take the time to help students/clients understand their strengths and progress in areas where they need to improve. We offer personalized tools for each of our clients to help them become more aware of their individual needs as they work towards short-term goals. Improving these skills will benefit our students’/clients’ long-term plans.


Is Pre-Calculus hard?

Precalculus, which is a combination of trigonometry and math analysis, bridges the gap to calculus, but it can feel like a potpourri of concepts at times. Students are suddenly required to memorize a lot of material as well as recall various concepts from their previous math courses.

Contact Themba Tutors!

Our Pre-Calculus Tutors work with all skill levels, travel to you, and offer remote tutoring services!

Free Consultation!!!

Call: (917) 382-8641, Text: (833) 565-2370 

Email: [email protected]

(we respond to email right away!).

Themba Tutors was recommended to us by a therapist I used to evaluate my daughter, a 7th grader in a public school in Manhattan, for possible learning disabilities related to math. She needed help with strategies for completing homework and keeping skills up to date, and also some remedial work to get her where she should be especially with the challenging Common Core curriculum. My daughter had used a few tutors in the past, but none of them were as effective as Matt. Matt has a very kind way about him and his genuine concern for my daughter s progress was apparent. He was able to focus her attention on the full sessions without her feeling stressed or overwhelmed. He adjusted the agenda to accommodate problem areas that arose and to address extra last-minute material that needed to be reviewed for upcoming tests. Her final report card reflected a 90 for the school year we couldn’t have been more thrilled! Matt has a real gift for teaching that significantly contributed to her getting on track. Thank you for recommending Matt!


-Mary Rose       

Jordan tutored our son in 7th grade math. We had a wonderful experience with Jordan. He was knowledgeable, always on time, and came up with some good strategies for our son to tackle difficult math concepts. Our son has a nonverbal learning disability so working with him can be somewhat challenging at times. But Jordan was always up to the task!


-Anne S.   

My son has been working with Jeffrey for math tutoring with brilliant results. Jeffrey helped reinforce the lessons from class, helping him build confidence and perseverance. Jeffrey worked diligently to prepare for each session by making sure he was aware of what material my son was covering each week. Jeffrey would arrive for sessions with problem sheets they could work from to strengthen his skills. He was always very patient, reassuring, and encouraging. While at the same time, he pushed Oliver toward mastery of the material. In six months, my son began to see himself as a capable, successful math student.


-Sara Baysinger