A12-ft by -15-ft rectangular swimming pool has a 3-ft-wide no-slip surface around it. what is the outer perimeter of the no-slip surface?
78 ft
78ft 2
198 ft
198 ft 2

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

Find the area of an equilateral triangle with a side of 6 inches

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?