(Middle school math) please help, thank you

Mathematics

2 answers:

Korvikt [17]2 years ago

6 0

I’m pretty sure it’s 18.6 if i did my math right

KatRina [158]2 years ago

5 0

Answer:

18.68 inches

Step-by-step explanation:

slant height² = r² + h²

slant height = $\sqrt{r^{2} + h^{2} }$

sh = $\sqrt{5^{2} + 18^{2} }$

sh = $\sqrt{25 + 324}$

sh = $\sqrt{349}$

sh = 18.68154 inches

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MariettaO [177]

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I'll assume the usual definition of set difference, $X-A=\{x\in X,x\not\in A\}$ .

Let $x\in X-(A\cup B)$ . Then $x\in X$ and $x\not\in(A\cup B)$ . If $x\not\in(A\cup B)$ , then $x\not\in A$ and $x\not\in B$ . This means $x\in X,x\not\in A$ and $x\in X,x\not\in B$ , so it follows that $x\in(X-A)\cap(X-B)$ . Hence $X-(A\cup B)\subset(X-A)\cap(X-B)$ .

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The proof of this is the same as above, you just have to indicate that membership, of lack thereof, holds for all indices $i\in I$ .

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