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gizmo_the_mogwai [7]
3 years ago
11

a scale drawing of a school bus has a scale of 2 inches to 5 feet. if the length of the school bus is 4 inches on the scale draw

ing, what is the actual length of a bus?
Mathematics
1 answer:
ddd [48]3 years ago
4 0
7 would be the answer to this question
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What is the slope of the line that passes through the points c(-2,4) and d(1,-1)
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The radius r(t)r(t)r, (, t, )of a sphere is increasing at a rate of 7.57.57, point, 5 meters per minute. At a certain instant t_
AnnZ [28]

Answer:

ds/dt=69743.35m^2/min

Step-by-step explanation:

The radius r(t)r(t)r, (, t, )of a sphere is increasing at a rate of 7.57.57, point, 5 meters per minute. At a certain instant t_0t 0 ​ t, start subscript, 0, end subscript, the radius is 555 meters. What is the rate of change of the surface area S(t)S(t)S, (, t, )of the sphere at that instant?

If i could understand the question correctly, the typos notwithstanding

r=radius, 555m

dr/dt=rate of change in radius 5m/min

ds/dt=rate of change in surface area   ?

S=area of a sphere 4\pi r^{2}

ds/dt=ds/dr*dr/dt.................................1

ds/dr=differentiation of the area of a sphere=8\pi r

ds/dt=8\pi 555*5

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The surface area of the sphere will change by 69733.35 square meters for every minute.

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