On the last day of school, 4 out of every 5 students wore their Christmas shirt. Based on this information, if 200 students attended the last day of school, write a proportion to determine how many students wore a Christmas shirt?

4:5

Step-by-step explanation:

Because 4 to 5 students.

i found two solutions,   n = 2 • ± √3 = ± 3.4641

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).