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katrin [286]
3 years ago
6

Please help! Please explain the steps and don't link files of the answers please!

Mathematics
1 answer:
ELEN [110]3 years ago
5 0

Answer:

A. 143% B. 70%

Step-by-step explanation:

A. 100/70= 1.4286

1.4286 * 100 = about 143%

B. 70/100 = 0.7

0.7 * 100 = 70 %

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If y varies directly as x and y = 21 when x = 5, find x when y = 42.
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varies directly means: \frac{y}{x} = k

Step 1: solve for k   ⇒  \frac{21}{5} = k

Step 2: plug in the given value and k to solve for the missing value: \frac{42}{x} = \frac{21}{5}

42(5) = 21(x)

\frac{42(5)}{21} = \frac{21(x)}{21}

2(5) = x

10  = x


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