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3 years ago

Simplify each expressions: a) -72÷8+(-6)-2 b) -4+(-32)÷(-4×5)

1 answer:

3 0

$\bf -72\div 8+(-6)-2\implies \stackrel{\mathbb{PEMDAS}}{-72\div 8-6-2}\implies -9-6-2
\\\\\\
-15-2\implies -17\\\\
-------------------------------\\\\
-4+(-32)\div(-4\times 5)\implies \stackrel{\mathbb{PEMDAS}}{-4+(-32)\div(-20)}
\\\\\\
-4+1.6\implies -2.4$

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Answer:

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Step-by-step explanation:

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3 years ago

Use the confidence interval to find the estimated margin of error. Then find the sample mean. A biologist reports a confidence i

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Answer:

$\bar X = \frac{Lower +Upper}{2}$

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Step-by-step explanation:

Assuming that the parameter of interest is the sample mean $\mu$ . And we can estimate this parameter with a confidence interval given by this formula:

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For this case the confidence interval is given by (1.9, 3.3)

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And the margin of error with this one:

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3 years ago

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Answer:

True

Step-by-step explanation:

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3 years ago

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<h3>For how many more minutes must the pie bake?</h3>

Let the amount of time spent in the oven be x

So, we have

Total amount of time = 60 minutes

This means that

Remaining time + Amount of time spent = 60

This gives

Remaining time + x = 60

Evaluate

Remaining time = 60 - x

Hence, the pie must stay for 60 - x more minutes must the pie bake