Can answer this for me please

There are 15 plates and each plate is either 7 or 12 inches diameter. which systems of equations do you use to find the number of 7 inch plates, x and 12 inch plates, y

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply