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uchechukwueigwe
07.07.2019 •
Mathematics
Arock is thrown in the air from the edge of a seaside cliff. its height in feet is represented by f(x) = –16(x2 – 3x – 18), where x is the number of seconds since the rock was thrown. the height of the rock is 0 feet when it hits the water.how long does it take the rock to hit the water? how many seconds?
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Ответ:
0 = -16(x^2 - 3x - 18) (Note: Please write x^2 to denote "square of x.")
Solving this equation for x, we get:
0 = -16(x-6)(x+3), and x=-3 or x=6. Since x represents time, discard the negative value x=-3.
The rock hits the water after 6 seconds.
Ответ:
stupid
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rat