The variables x and y vary directly. Use the values to find the constant of proportionality and write an equation that relates x
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When multiplying terms that have the same base (in this case, ) but different exponents, you can add their exponents to make them one term.
In this case, we can add the exponents of :
A simplified version is .
Check the picture below.
thus is at 0 = -16t² + 96t +640,
well, clearly it can't be a negative value for the elapsed seconds, so it can't be -4.
thus is at 0 = -16t² + 96t +640,
well, clearly it can't be a negative value for the elapsed seconds, so it can't be -4.