HELP When does expanding and simplifying a(b + c) result in a positive value for ac?

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 you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left

Simplify the following expression 48^1/2