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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?

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

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