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Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

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?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way