Dave have 15dollar to spend on an 8 dollar book and two birthday cards (c )for his friends. how much can he be spend on each card if he buy the same card for his friend

$3.50 could be spent on each card

Step-by-step explanation:

$15.00 -$8.00 = $7 / 2 = $3.50

36

step-by-step explanation:

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