How much is 31.6333 in feet and inches?

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

Me find the value of x each figure.

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?