3 years ago

What's the answer witch ones r composite 14 15 16 17 18 19 20 21

2 answers:

6 0

A composite number is a number with more than 2 factors and 16, 18, 20, and 21 are composite.

4 0

14 and 15 are also composite:

14 - 1×14, 2×7
15 - 1×15, 3×5

the first person probably didn't see the first row of numbers

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Ad libitum [116K]

Answer:

12.9

Step-by-step explanation:

AB = $\sqrt{2^{2}+3^{2} }$ = $\sqrt{13}$

BC = $\sqrt{2^{2}+2^{2} }$ = $2\sqrt{2}$

CD = $\sqrt{1^{2}+2^{2} }$ = $\sqrt{5}$

DE = 3

EA = $\sqrt{1^{2} + 2^{2} }$ = $\sqrt{5}$

The sum of all of these (in decimal form) is (approx.) 12.9

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2 years ago