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lisabon 2012 [21]
3 years ago
7

help me wit these 3 questions plz. A cone has a base radius of 7 centimeters and a height of 21 centimeters.   What is the volum

e of the cone?         A. 28π cm3       B. 49π cm3       C. 147π cm3       D. 343π cm3

Mathematics
1 answer:
poizon [28]3 years ago
7 0
1. Cone

r=7cm
h=21cm

V= \frac{\pi*r^2*h}{3}=\frac{\pi*7^2*21}{3}=7^2*7*\pi=7^3\pi=343{\pi}cm^3

Answer: D

2. Cylinder

r=5ft
h=16ft

V= \pi*r^2*h=\pi*5^2*16=25*16\pi=400\pi ft^3

Answer: A

3.Pyramid

In this case it will be

V= \frac{a*b*h}{3}

a=9ft
b=4ft
h=12ft

V= \frac{4*9*12}{3}=4*3*12=144 ft^3

Answer: B
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Answer:

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The same odds are valid for only the second or only the third die being red. Therefore, the probability that exactly one die turns up red is:

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The probability that at least one die turns up red is the sum of the probabilities of exactly one (found in the previous item), two or all dice turning up red.

Following the same logic as in the previous item, the probability that exactly two dice turn up red is:

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