SOLUTION: Read and answer each. 1. Is 30 a perfect number? explain your answer. 2.Is 21 a prime number? Is 43 a prime number?Explain. 3.Give an example of a composite number and tell why

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Question 643008: Read and answer each.
1. Is 30 a perfect number? explain your answer.
2.Is 21 a prime number? Is 43 a prime number?Explain.
3.Give an example of a composite number and tell why it is a composite number.
4.Is 48 a multiple of 6? Is 8 a multiple of 40? Explain.
5. Is 8 a factor of 20? Is 7 a factor of 35? Explain.
Answer by jim_thompson5910(35256) (Show Source):
You can put this solution on YOUR website!
1. Is 30 a perfect number? explain your answer.

No, 30 doesn't equal the sum of its factors.

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2.Is 21 a prime number? Is 43 a prime number?Explain.

No, 21 = 7*3 which means it's not prime. The number 43 is prime since its only factors are 1 and 43.

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3.Give an example of a composite number and tell why it is a composite number.

27 is a composite number since 27 = 3*9, so it can be factored into the product of two smaller numbers (none of which are 1 or 27)

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4.Is 48 a multiple of 6? Is 8 a multiple of 40? Explain.

48 is a multiple of 6 since 48 = 6*8. The number 8 is NOT a multiple of 40 since 8 = 40x has NO integer solution.

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5. Is 8 a factor of 20? Is 7 a factor of 35? Explain.

8 is NOT a factor of 20 since 8x = 20 has no integer solution

7 is a factor of 35 since 35 = 7*5