For a sale, a store decreases its prices on all items 20%. an item that cost $120 before the sale now costs $120 - 0.2($120). what is another expression for the sale price?

An equation of the line tangent to y=x^3+3x^2+2 at its point of inflection is

What is the total surface area of this square pyramid?

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?