The function f(x) is the total amount spent at a store, when purchasing x items that are $5 each and the items are not taxable.

What is the practical domain for the function f(x)?

all whole numbers

all positive integers that are multiples of 5

all real numbers

all positive integers

Which characteristic is correct for the function f(x)=−2x^{4}+3x^{2} ?

even

neither even nor odd

odd

both even and odd

jbouyer Feb 13, 2018