If a varies directly with b and a = -2 when b =3 what is the constant of variation

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

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?

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?