slippedsumo
03.10.2019 •
Mathematics
The data given for a football kicked from the field follows a quadratic model, h(x) = - 3x2 + 18x +7 . where h(t) is the height in feet and t is the in seconds. using this model, at what time will the ball reach its maximum height
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Ответ:
The time at which the ball will reach its maximum height is t= 3 seconds.
Step-by-step explanation:
To find the the time at which the ball will reach its maximum height, we need to solve the model given - 3x2 + 18x +7
since h(t) is the height given we can re-write the equation as:
h(t)= -3(t)² + 18t +7
Differentiating the above equation
When the ball is at maximum height
0=-6t+18
-18 = -6t
=> t= -18/-6
=> t= 3
the time at which the ball will reach its maximum height is t= 3 seconds.
We can find the maximum height by putting value of t in equation:
h(3) = -3(3)²+ 18(3) +7
h(3)= -27 + 54 + 7
h(3)= 34 ft
Ответ:
\frac{\sqrt{3} }{2} - .75
Step-by-step explanation:
cot Θ = Sqrt (3)
SinΘ = 1/2 CscΘ = 2
CosΘ = Sqrt3 / 2 SecΘ = 2Sqrt3 / 3
TanΘ = Sqrt3 / 3 CotΘ = Sqrt (3)
Cotangent is Adjacent over Opposite
Adjacent = Sqrt 3
Opposite = 1
That means the Hyp = 2 (Pythag Theorem)
Sin Θ * Cot Θ - CosΘ ² =
1/2 * Sqrt 3 - .75 = (Sqrt3 / 2) - .75
Sqrt3 / 2 - .75 is as far as I can get.