Question

The rectangle below has a length of 4x+3 and a width of 3x.

a) Find the perimeter
b) Find the are
c) Find the perimeter and are if x = 8

I am having trouble on Part c, so help would be much appreciated. Ty and have a good day.

Answer 1

Explanation:

a) perimeter is 2(4x+3+3x)= 2(7x+3) = 14x+6

b) the area is (4x+3)3x= 12x²+9x

c) as the perimeter is 14x+6 and x=8, it will equal 14*8+6= 112+6=118

as the area is 12x²+9x it will equal 12*8*8+9*8=768+72=840