I need to find the surface area of these triangles, someone please help!

What is the missing step in this proof ?

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

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