Answer:
X= 3.7
Step-by-step explanation:
Perimeter of rectangle= 2(L+B)
37= 2(4X+X)
37= 2(5X)
37= 10X
37/10=X
3.7= X
please forgive me I have no clue
13x - 12 =
17x + (-4x) = 13x
(-5) + (-7) = -12