Select all that apply. The standard deviation (or MAD) is a number that helps us understand...

A. measure of variability
B. measure of center
C. how far data is away from the median
D. how far data is away from the mean

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Rachel reads 1/5 of the pages of a book plus 12 pages on the first day. on the second day, she reads 1/4 of the remaining pages plus 15 pages. on the third day, she reads 1/3 of the remaining pages plus 18 pages. on the fourth day, she reads the remaining 70 pages. how many total pages are in the book?

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?