F(x)=12.9−2x find f(2)

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.

Julie buys 2kg of apples and 7kg of pears ? 12.70. the pears cost ? 1.30 per kilogram what is the price per kilogram of the apples? show your working out

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab