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ad-work [718]
4 years ago
10

28 is what percent to 31

Mathematics
1 answer:
cupoosta [38]4 years ago
4 0

if we take 31 to be the 100%, what is 28 off of it in percentage?

\bf \begin{array}{ccll} amount&\%\\ \cline{1-2} 31&100\\ 28&x \end{array}\implies \cfrac{31}{28}=\cfrac{100}{x}\implies 31x=2800\implies x=\cfrac{2800}{31} \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill x\approx 90.32~\hfill

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Which two ratios represent quantities that are proportional?
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A is correct (33/18 and 66/26)

Step-by-step explanation:

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4 years ago
Which are the solutions of x2 = –7x – 8?
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You can start by rewriting the equation so that the right side equals zero. Add -7x and 8 to both sides.

x^2+7x+8=0

You can now use the quadratic equation (below), where a=1, b=7, and c=8, to find solutions. Plug in these values for a, b, and c into the equation and simplify.

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The final answer is the combination of both solutions.
x=\frac{-7}{2} \pm \frac{\sqrt{17}} {2} \approx -3.5 \pm 2.06.

Or approximately...
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3 years ago
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