15 4 Write a program that calculates a car's gas mileage. The program should ask user to enter the number of gallons of gas the car can hold, and the number of miles it can be driven on the full tank. It should then display the number of miles that may be driven per gallon of gas. 15 15 3 Write a program that calculates and displays volume of a cylindrical fuel tank. The formula for the volume of a cylinder is Volume = 'h Where = 3.14159, r is the radius of the tank, his height of the tank. Write a program that calculates a car's gas mileage. The program should ask user to enter the number of gallons of gas the car can hold, and the number of miles it can be driven on the full tank. It should then display the number of miles that may be driven per gallon of gas. 5 Write C++ expression for the following algebraic equation A. B = x +2 2 B. y=x? z? C. a = x+y+z_ (a+b)- 6 Find errors in the following programs and also provide solution to those programs. A. using namespace std; int main() 15 10 double number1, number2, sum; cout