Colin invests £4000 into his bank account. He receives 5% per year simple interest.
How much will Colin have after 3 years?

4,600

Step-by-step explanation:

A = P(1 + rt)

P = 4000

r = 0.05 (rate in percent form)

t = 3 years

A = 4000(1 + (0.05)(3))

A = 4000(1+0.15)

A = 4000(1.15)

A = 4,600

mr. graef told us it is 13 pints

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).