Write an expression to represent the perimeter of a rectangle with the length of x -4 and width of 2x +8

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective