Will mark brainliest if correct angle must be complementary to angle 3?

a. ∠2
b. ∠4
c. ∠5
d. ∠6

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?

What percent of 18 is 24? and plz explain thx.