Answer:
x = 74
y = 37
z = 25
Step-by-step explanation:
x -- 180-106=74
y -- 74/2=37
z -- 4z+6=106
subtract 6 from both sides 6-6=0, 106-6=100
4z=100
divide by 4 on both sides 4z/4=1z, 100/4=25
they travel 115 km/h long
7 units
=7
a)60, b)14580, c)20*3^n
