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3 years ago

How do i do thisss? #7 plzzzzz

Mathematics

1 answer:

maria [59]3 years ago

6 0

Answer:

A = 143.1 in^2

Step-by-step explanation:

The area of a circle is given by

A = pi r^2

But we are given the diameter

r = d/2 = 13.5 /2 = 6.75

A = pi (6.75)^2

We can use 3.14 for pi

A = (3.14) (6.75)^2

A =143.06625 in^2

To the nearest tenth

A = 143.1 in^2

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The height of a toy rocket that is shot in the air with an upward velocity of 48 feet per second can be modeled by the function

Irina18 [472]

Answer:

B) 36 ft

Step-by-step explanation:

Given:

The height as a function of time is given as:

$f(t)=-16t^2+48t$

At maximum height, the instantaneous velocity becomes 0. The instantaneous velocity is the first derivative of the height function.

So, the derivative of the the given function is 0 at the maximum height.

Differentiating the above function with time, we get

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Therefore, time taken to reach maximum height is 1.5 s.

Now, maximum height is obtained by plugging in $t=1.5$ in the height equation.

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$h_{max}=-16(1.5)^2+48(1.5)\\h_{max}=-16\times 2.25+72\\h_{max}=-36+72\\h_{max}=36\ ft$

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How do i do thisss? #7 plzzzzz​

How do i do thisss? #7 plzzzzz