What is the square root of 144 simplified

What is the result of adding the system of equations? 2x+y=4 3x-y=6

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.