This question has two parts. First, answer Part A. Then, answer Part B.
Part A

FENCING The figure shows Derek’s house and his backyard on a coordinate grid. Derek is planning to fence in the play area in his backyard. Part of the play area is enclosed by the house and does not need to be fenced. Each unit on the coordinate grid represents 5 feet. The cost for the fencing materials and installation is $10 per foot.
How much will it cost Derek to install the fence?

$
Part B

Explain your reasoning.

The side of the play area that is adjacent to the house , 1 of 7. need fencing. The remaining , 2 of 7.sides of the play area on the grid have lengths of 4, 5, and , 3 of 7. units. The perimeter of the play area to be fenced on the grid is , 4 of 7. units. Each unit on the grid represents , 5 of 7. feet, so Derek will need , 6 of 7. feet of fencing. The cost of the fencing is $10 per foot, so the total cost will be , 7 of 7..