(−3⋅10^3 )⋅(4⋅10^6)=???

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Cal's go cart has a gas tank with the dimensions shown below. he uses a gas can that holds 11 gallon of gas, to fill the go cart tank. 11 gallon = 231 inches^3 how many full gas cans will it take to fill the go cart's gas tank?

Atown has a population of 12000 and grows at 3.5% every year. what will be the population after 7 years, to the nearest whole number?