Determine the unknown side of the similar triangle.
a) 8
b) 12
c) 18
d) 24

(hurry! ) which expression is equivalent to the following complex fraction?

87.5% , 100% , 83.33 , 93.33% , 100% , 82.5% are all the academic points i've gotten this quarter. what's my final grade?

Let f(x) = 1/x^2 (a) use the definition of the derivatve to find f'(x). (b) find the equation of the tangent line at x=2