1. Dan baked some cookies. Sam took half the cookies. Then, Sue took half of the cookies that
were left. When Dan came home, he saw only three cookies. How many cookies did Dan bake
originally? Explain your answer.

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

(1 km=1000m, 1m=100 cm)