V=ca times height
1040=40 times h
H=1040 divide by 40
Height=26
115 = 10X + 0.25(60)
115 = 10x +15 (this is the equation to use)
100=10x
x=10 hours
Irrational because it can not be written as a fraction
X+a=b
you want to isolate x so subtract a from both sides
x=b-a
