Evaluate 4x - 3y when x=2 and y = -1

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

George has seven boxes of five pencils. giulio three boxes of eight pencils. one of the boys arranges all his pencils equally into two groups. was this george or giulio how many are in each group explain

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?