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3 years ago

11

By switching service providers , a family's telephone bill decreased from about $ 50 a month to about 44 . What was the percent

decrease ?

1 answer:

anyanavicka [17]3 years ago

6 0

Answer:

12% decrease

Step-by-step explanation:

50 - 44 = 6

6/50 = 0.12 or 12% decrease

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Dafna1 [17]

$\sin {}^{2} (x) + {cos}^{2} (x) = 1$

${sin}^{2} (x) = 1 - {cos}^{2} (x)$

${sin}^{2} (x) = 1 - ({ \frac{ - 7}{9} })^{2} \\$

${sin}^{2} (x) = 1 - \frac{49}{81} \\$

${sin}^{2} (x) = \frac{81}{81} - \frac{49}{81} \\$

${sin}^{2} (x) = \frac{32}{81} \\$

$\sin(x) = ± \sqrt{ \frac{32}{81} } \\$

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$\tan(x) < 0 \: \: \: and \: \cos(x) < 0$

Thus :

$\sin(x) > 0$

So we have :

$\sin(x) = + \sqrt{ \frac{32}{81} } \\$

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