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3 years ago

Please help me will give brainliest

Mathematics

1 answer:

oksian1 [2.3K]3 years ago

7 0

Answer:

m = $\frac{13}{3}$

Step-by-step explanation:

Given

$\frac{1}{12}$ = $\frac{m-4}{4}$ ( cross- multiply )

12(m - 4) = 4 ( divide both sides by 12 )

m - 4 = $\frac{4}{12}$ = $\frac{1}{3}$ ( add 4 to both sides )

m = 4 $\frac{1}{3}$ = $\frac{13}{3}$

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Which sets of numbers are closed under subtraction?

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How did the temperature change if: at first it decreased by 60% and then increased by 80%. PLEASE NEED HELP!

Sergio039 [100]

The temperature decreased by 28%

Step-by-step explanation:

How did the temperature change if :

At first it decreased by 60%
Then increased by 80%

Assume that the temperature before decreasing is 100%

∵ The temperature before decreasing = 100%

∵ It decreased by 60%

→ Before decreasing : decreasing : after decreasing

→ 100% : 60% : 100% - 60% = 40%

∴ The temperature after decreasing = 40%

Assume that the temperature after decreasing is 100%

∵ The temperature after decreasing = 100%

∵ It increased by 80%

By using the ratio method

→ After decreasing : increasing : after increasing

→ 100% : 80% : 100% + 80% = 180%

→ 40% : : x%

By using cross multiplication

∴ 100% × x% = 40% × 180%

- Divide both sides by 100%

∴ x% = $\frac{(40)(180)}{100}$

∴ x% = 72%

∵ At first the temperature = 100%

∵ At last the temperature = 72%

∵ The first the temperature > the last the temperature

∴ The decreasing in temperature = 100% - 72% = 28%

The temperature decreased by 28%

Learn more:

You can learn more about ratio in brainly.com/question/2707032

#LearnwithBrainly

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