If the side lengths of a square are doubled, then how much area will be increased?

If the sides of a triangle are doubled, then its area

The percentage increase in the surface area of a cube when each side is doubled is

If each side of a cube is decreased by 10%, by how much will its volume decrease?

A triangle has side lengths x cm, x + 13 cm and x + 26 cm. If its area is 126 square cm, then what is the value of x ?

If the length of a rectangle is increased by 1/3rd and the width is decreased by 1/3rd, then the area of the rectangle is decreased by the fraction