Which elements of Set Z are both odd and multiples of 7? Z = {−21, −14, −7, 0, 7, 14, 21}
�� {−21, 21}
�� {−21, −7, 7, 21}
�� {−14, 0, 14}
�� {−21, −14, −7}

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

answer: #1 ads up by 8 and i don't know #2

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).

the answer is 8.64

step-by-step explanation: