X = 10 * 3^n
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The ratio is 4/3 because you add AC which is 12 and then divided 9 (BC) by 12
If the apple is on the ground, then the height y is 0. To find t, just plug in 0 for y:




So the answer is 2.74 seconds.
Note that taking the square root of 7.5, mathematically, gives you both 2.74 and -2.74. But because we know that time did not go backwards, only the positive value for t was considered.