Sample Response: Scientists are creating vaccinations that prevent people from getting bird flu. If the virus mutates, a new vaccine needs to be made. The vaccine needs to be tested, which can be dangerous. It also takes a long time for scientists to know whether the vaccine works. Which ideas did you include in your answer? Check all that apply. Scientists are creating vaccines. Viruses that mutate need new vaccines. Vaccines take a long time to make. Vaccines need to be tested.

i need the options

step-by-step explanation:

b

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).

2, 2, 2 or -4, 20, 29

step-by-step explanation:

there is two ways you can do it.