A) 5 . 2^x+5 =160
2^x+5 = 32
2^x+5 = 2⁵
X+5= 5
X= 5-5
X=0

B) 7. 2^x-5 = 56
2^x-5 = 8
2^x-5 = 2³
X-5 =3
X= 3+5
X=8