What fraction of the student finished in less than 20 minutes?

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left

Find the maximum value of p= 4x + 5y subject to the following constraints :