Calculate the Rate of change

You have a square piece of cardboard that measures 14 inches on each side. to build a box, you cut congruent squares out of each corner of the cardboard. use the picture to find the area of the cardboard you were used to build the box

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.