Which value is equivalent to x-7/7-x A) -7 B) -1 C) 1 D) 7

Mathematics

2 answers:

I am Lyosha [343]3 years ago

5 0

(x-7)/(7-x) if you factor out -1 from the numerator you get:

-(7-x)/(7-x) which is equal to:

-1

gtnhenbr [62]3 years ago

5 0

The answer is B, because x-7/7-x will equal the negative version of the number on each end, which divided to -1.

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$\displaystyle \iint_R\frac{\mathrm dx\,\mathrm dy}{\sqrt{x^2+y^2}} = \int_0^{\pi/2}\int_2^3 \frac{r\,\mathrm dr\,\mathrm d\theta}{\sqrt{r^2}} \\\\ = \int_0^{\pi/2}\int_2^3 \mathrm dr\,\mathrm d\theta \\\\ = \frac\pi2\int_2^3 \mathrm dr \\\\ = \frac\pi2r\bigg|_2^3 = \frac\pi2 (3-2) = \boxed{\frac\pi2}$