https://photomath.net/s/6O312e
^ that link will show you step by step and explain it, rather than writing a whole paragraph, Hope that helps:)
The multiplicative inverse of something is a fancy way to say reciprocal.
A reciprocal is a fancy way to describe the action of flipping the fraction.
So flip 35/9 to get 9/35.
That's the multiplicative inverse.
18 liters of 14% bleach contains 0.14×18 = 2.52 liters of bleach.
Adding 
liters of pure water to the solution increases the total volume to 
liters without changing the total amount of bleach.
To end up with a 10% bleach solution, we must add
liters of water.
The circumference formula for a circle is 'c=2πr'.
C = circumference
π = 3.24
r = radius (1/2 the diameter)
All you need to do is plug in the numbers you are given. So the circumference = (2)(3.14)r
