Answer is 4 books per minute. 240 (books) divided by 60 (minutes in one hour) equals 4
It is 10 (make proportions and solve for x)
The answer to the variable b is 708.4
There are many pairs that are solutions to this inequality. You can find them all by graphic this on a coordinate plane and then shading the region.
You can also plug any of the ordered pairs that they give you into the equation and see if they produce a true statement.