Which of these statements are true for joint variations? Check all that apply. There are at least two constants of proportionality.

The independent variable is related to the product of the independent variables by a constant of proportionality, k.

The equation must have at least two independent variables.

The constant of proportionality is 1.

B and C

Step-by-step explanation:

Just did it on edg

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).