Which of the ten basic functions in our toolkit are decreasing on the

interval (-[infinity], 0)?

a) x2, , x

b) ex, x2, In(x)

c) x3, Ixl,

1

x

d) VX, x3, x2

8+10

step-by-step explanation:

you multiply 4 by 2 and 5 by 2

answer: group b.

step-by-step explanation:

f(x)=4

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).