5
Step-by-step explanation:
Length of rectangle = 3x + 4
Width of the rectangle = 2x + 6
Perimeter of rectangle = 2(l + b)
45 = 2(3x + 4 + 2x + 6)
45 = 2(5x + 10)
45 = 10x + 20
45 - 20 = 5x
25 = 5x
x = 25/5
x = 5
How so?