Is 4/7 a rational number

The perimeter of a rectangular lot of land is 436 ft. this includes an easement of x feet of uniform width inside the lot on which no building can be done. if the buildable area is 122 ft by 60 ft, determine the width of the easement. select one: a. 9 feet b. 18 feet c. 4.5 feet d. 7 feet

If 3 3/4 lb. of candy costs 20.25 how much would 1lb. of candy cost

What is the simplified form of square root of 400 to the 100th power ?