-5x+12=-13

Show all of your work

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

Atown has a population of 17000 and grows at 2.5% every year. to the nearest year, how long will it be until the population will reach 19600?

The population in a city is modeled by the equation p(d)= 100,000*(1+0.3) where d is the number of decades since 1970