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3 years ago

Sara says, "If you subtract 15 from my number and multiply the difference by -7, the result is -133. What is sara's number

Mathematics

1 answer:

Delvig [45]3 years ago

7 0

Answer:

Step-by-step explanation:

-133/-7=19+15=39

check:39-15=19

19x(-7)=-133

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3 years ago

The price of a cup coffee was 2.40 yesterday. Today, the price fell to 2.15 find the percentage decrease. Round the answer to th

irakobra [83]

ANSWER

The percentage decrease is 10.4%.

EXPLANATION

To calculate percentage decrease, use the formula,

Percentage decrease

$= \frac{new \: price - old \: price}{old \: price} \times 100\%$

Yesterday the price of coffee was 2.40. This is the old price.

Today the price is 2.15. This is the new price.

$= \frac{2.15 - 2.40}{2.40} \times 100\%$

$= \frac{ - 0.25}{2.40} \times 100\%$

$= - 0. 10416667 \times 100\%$

$= - 10.416667\%$

To the nearest tenth, we have:

$- 10.4\%$

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3 years ago