Can anyone help me with this review preview assignment?

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

Find the distance between the pair of points a(-1,8) and b(-8,4)

Can someone me with this? i’m not sure what to put for my equations.