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Expert: Sherry Wallin - 6/11/2010


Question

Problem
Hello sir, I've had a problem that has completely baffled my mind over the past few days, and I would like to have that problem answered.  I have attached the question in an image below, and I would like you to answer it, thank you in advance!

Answer
Charles, have you made an error in your image? You have x^2 x 10, did you mean x^2 + 10??

Math Prof

If I assume you meant x^2 + 10 and the other adjacent angle is x + 8 and you know that
x^2 + 10 + x + 8 = 90, then you have x^2 + x - 72 = 0 which factors as (x + 9)(x - 8) = 0
which means either x + 9 = 0 or x - 8 = 0 and then x = -9 or x = 8. Scratch x = -9 since we don't use negative angle measurement (x + 8 with x = -9 makes x + 8 = -9 + 8 = -1). The only possibility is that x = 8.

Math Prof

Sherry Wallin

Expertise

I can answer most questions up through Calculus and some in Number Theory and Abstract Algebra.

Experience

I have had my Bachelor's Degree since 1987 and have been a teacher since 1988. I earned my Masters Degree in Mathematics May 2010. I have been teaching at the same community college since 2002.

Education/Credentials
I have taught 12 years at the community college level, medical college, and technical college as well as a high school instructor and alternative education instructor and charter school instructor.

Awards and Honors
Master's GPA 3.56 Bachelor's GPA 3.34 Post grad work not degree related GPA 4.0

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