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Colt1911 [192]
3 years ago
6

Find the surface area and volume of a sphere with a radius r = 0.8 ft. Round your answer to the nearest tenth. A. 7.8 ft2; 2.6 f

t3 B. 8.4 ft2; 1.8 ft3 C. 8.0 ft2; 2.1 ft3 D. 8.2 ft2; 2.3 ft3
Mathematics
1 answer:
fiasKO [112]3 years ago
7 0
Surface area of a sphere = 4πr² 

Surface area of the sphere = 4π(0.8)² = 8.0 ft²


Volume of a sphere = 4/3 πr³

Volume of the sphere = 4/3 π(0.8)³ = 2.1 ft³


Answer: Surface area = 8.0 ft² and volume - 2.1 ft³ (Answer C)
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attashe74 [19]

Answer:

A = 26

Step-by-step explanation:

sum of students = classA + classB + classC

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class A has five more students than class B, so A = 5 more than B so A = 5+B

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substitute 5+B for A and B-2 for C in the first equation to limit this to one variable (B)

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2 years ago
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