Write a congruence statement for the figures below

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Solve 2x+y=3 x+y=5 in substitution method

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?