Noah put $40 on his fare card. Every time he rides public transportation, $2.50 is subtracted from the amount available on his card.
How much money, in dollars, is available on his card after he takes
• O rides?
1 ride?
• 2 rides?
.
x rides?

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

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