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hjlf
3 years ago
15

!!!!Do not respond with I don't know or anything but help with the answer just for the points!!!!! The average test score A of f

ive test scores t 1​, t 2​, t 3​, t 4​, and t 5 can be computed by the formula shown below.
A=t 1​+t 2​+t 3​+t 4​+t 5/(over)5

If a student has test scores of 88​, 71​, 80​, and 72​, what score does she need on the fifth test so that her​ five-test average is 76​?
Mathematics
1 answer:
zepelin [54]3 years ago
8 0

Answer:

69

Step-by-step explanation:

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The radius of a right circular cone is increasing at a rate of 1.5 in/s while its height is decreasing at a rate of 2.1 in/s. At
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Answer:

The volume of the cone is changing at a rate of approximately 8670.796 cubic inches per second.

Step-by-step explanation:

Geometrically speaking, the volume of the right circular cone (V), in cubic inches, is defined by the following formula:

V = \frac{1}{3}\cdot \pi \cdot r^{2}\cdot h (1)

Where:

r - Radius, in inches.

h - Height, in inches.

Then, we derive an expression for the rate of change of the volume (\dot V), in cubic inches per second, by derivatives:

\dot V = \frac{1}{3}\cdot \pi \cdot (2\cdot r\cdot h \cdot \dot r + r^{2}\cdot \dot h) (2)

Where:

\dot r - Rate of change of the radius, in inches per second.

\dot h - Rate of change of the height, in inches per second.

If we know that r = 120\,in, \dot r = 1.5\,\frac{in}{s}, h = 107\,in and \dot h = -2.1\,\frac{in}{s}, then the rate of change of the volume is:

\dot V \approx 8670.796\,\frac{in^{3}}{s}

The volume of the cone is changing at a rate of approximately 8670.796 cubic inches per second.

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