Two boys who live 14 miles apart start at noon to walk toward each other at rates of 3 mph and 4 mph respectively. in how many hours will they meet?

In a certain pentagon, the interior angles are a, b,c, d,e where a, b,c, d,e are integers strictly less than 180. ("strictly less than 180" means they are "less than and not equal to" 180.) if the median of the interior angles is 61 and there is only one mode, then what are the degree measures of all five angles?

At which value in the domain does f(x) =0?

Solve the system of equations. y= 2x y= x^2 - 15