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OpenStudy (anonymous):
rocket is projected upward from ground level height equation h=-16t^2+160t. after how many seconds is the height 336 feet?
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OpenStudy (anonymous):
1.92 seconds? i dont have a graphing calculator so im not 100% on that
OpenStudy (anonymous):
what is the formula used?
OpenStudy (campbell_st):
substitute h = 336 so 336 = -16t^2 + 160t rewriting the equation 16t^2 - 160t + 336 = 0 just solve the quadratic...you may be able to take out a common factor of 8 to simplify the quadratic.
OpenStudy (anonymous):
thank you
OpenStudy (campbell_st):
Looking at the question you'll need the general quadratic formula... but I think 16 divides into every term to simplify the problem
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