You can put it in a calculator, or do long division on a piece of paper. I would show you how to break it down step-by-step, but doing long division on here is complicated.
All you have to do is find the decimal of a fraction is to divide the numerator and the denominator.
In this case, divide 37 by 40 to get your decimal.
37 ÷ 40 = 0.925
So, the decimal form of 37/40 is 0.925.
Let y=f(x)
y=sqrt(10-3x)
you want to make x the subject
square both sides
y²=10-3x
3x=10-y²
x=(10-y²)/3
now replace y with x
f^-1(x)=(10-x²)/3
