Answer:
35%
Step-by-step explanation:
total cost = membership +cost per class* number of classes
y = 275+5*x
Choice C
First we will evaluate: ( substitution: u = x² - y², du = - 2 y dy )

=

( than plug in x and 0 )
=

=
= 1/3 x³ ( then another integration )

= 1/3 * 1/4 =
1/12