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3 years ago

The prime factorization of N is 3^3 * 7^r. If N has exactly 16 positive integer factors, what is the value of R?

Mathematics

2 answers:

lord [1]3 years ago

8 0

Answer:

3^3 * 7^r has (3 + 1)*(r + 1) = 16 factors.

So r must be 3.

LenaWriter [7]3 years ago

3 0

Answer:

Step-by-step explanation:

N = 3^3 * 7^r

N has 16 integer factors

3^3 is 3 factors

That means 7^r must be 16-3 or 13 factor

7^r must be 13 terms

so 7^r must be 7*7*7..... *7 so that there are 13 term which means

r must be 13

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