Which equation represents the following word problem: A car is traveling twice as fast as a truck. If their combined speed is 105 miles per hour, find the speed of the car and find the speed of the truck.
A. s + s = 105
B. s(2s) = 105
C. 3s = 105
D. s = 105

36 is the final answer! : )

0.50 , 0.75

step-by-step explanation:

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).