Enable contrast version

# Tutor profile: Jon S.

Jon S.
Ph.D., teacher at university and high school for 20+ years

## Questions

### Subject:Trigonometry

TutorMe
Question:

Given sin x = 0.4, solve for x.

Jon S.

As is often the case for trig problems, the only way to get the "x" out of the expression "sin x" is to take the "inverse operation" on both sides. Since the function is sine, we use the inverse sine function. Therefore: sin x = 0.4 sin⁻¹ (sin x) = sin⁻¹ 0.4 x = sin⁻¹ 0.4 (which is a value that can be determined by a calculator). This pattern works for a wide variety of problems in Trig (and Precalculus).

### Subject:Earth Science

TutorMe
Question:

Oceanic crust is generally much younger than the crust that makes up the continents. Explain why.

Jon S.

Along mid-ocean ridges, new oceanic crust is continually forming. Meanwhile, the oldest oceanic crust sinks (or "subducts") deep into the Earth along oceanic trenches. These ongoing processes mean that all oceanic crust is much younger than continental crust, which does not experience these processes.

### Subject:Algebra

TutorMe
Question:

Find the zeros of f(x)= x³+3x²-x-3 graphically.

Jon S.

Using an online graphing utility such as Desmos.com, the given function is plotted and the x-intercepts of the function are found. These are the values of x such that f(x)=0 -- that is, the "zeros" of the function. In this case, the x-intercepts are at (-1,0), (1,0), and (-3,0). This also ends up telling us that this function can be factored as (x+1)(x-1)(x+3).

## FAQs

What is a lesson?
A lesson is virtual lesson space on our platform where you and a tutor can communicate. You'll have the option to communicate using video/audio as well as text chat. You can also upload documents, edit papers in real time and use our cutting-edge virtual whiteboard.
How do I begin a lesson?
If the tutor is currently online, you can click the "Start Lesson" button above. If they are offline, you can always send them a message to schedule a lesson.
Who are TutorMe tutors?
Many of our tutors are current college students or recent graduates of top-tier universities like MIT, Harvard and USC. TutorMe has thousands of top-quality tutors available to work with you.
BEST IN CLASS SINCE 2015
TutorMe homepage