Question

Please do 13th question .....both a and b.....
I will mark brainliest to the best answer....
#be brainly

Answer 1

(a) Area = l×b
3x = 8× (x-5)
3x = 8x - 40
3x - 8x =-40
-5x = -40
5x = 40
x = 40/5
x= 8

(b) Perimeter = 2 (l+b)
40 = 2 (8 + x-5)
40 = 16 + 2x - 10
40 = 6+2x
40 -6 = 2x
34 =2x
34/2 = x
17 =x


$hope \: helps$