Who has the biggest of brain

The square root of 9x plus 7 plus the square rot of 2x equall to 7

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.

Mr. lash has 42 pounds of dog food to divide among his dogs. if each dog receives 7/8 pounds of food for each feeding, how many times can mr. lash feed his animals?