Abakery sold 1/2 its bread in the morning .that afternoon it sold 21 mpre loaves and had 6 left .how many loaves did the bakery habe at the beginning of the day?

The bakery had 54 loaves of bread in the morning. You can prove this by adding the 21 loaves of bread to the seven they have left, then multiplying it times two because it sold half the bread in the morning.

27*2=54 total at the beginning of the day.

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).