The ratio of girls to boys in a certain grade is 9;8. If there are 72 girls in the grade, how many boys are there?

Step-by-step explanation:

Given

Required

Find the number of boys

Substitute 72 for girls in

Convert ratio to fraction

Multiply both sides by 72

step-by-step explanation:

to determine whether a given function is even, we simply substitute x with -x in the expression. if the result after simplification is identical to the original equation, then the function is said to be even other wise odd.

f(-x) = (-x)^2 - (-x) + 8

      = x^2 + x +8

the resulting function is not identical to the original one;

f(-x) ≠ f(x)

therefore, f(x) is not an even function