Answer:
Step-by-step explanation:
Begin with the fact that the area of a rectangle is A = L * W. We know that the area is 42 and the length is 7, therefore, we can sub those values into the area formula to solve for the width.
42 = 7 * W so
w = 6 mm.
The perimeter formula is P = 2L + 2W, and now we know L and W. So
P = 2(7) + 2(6)
P = 14 + 12
P = 26
