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3 years ago

-3.6≥-0.3a+12 help please i will mark brainliest

Mathematics

1 answer:

Kamila [148]3 years ago

8 0

Answer:

Solving the inequality for a, you get:

<u>Inequality form</u>: a≥52

<u>Interval notation</u>: [52,∞)

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Peggy had three times as many quarters as nickels. She had $1.60 in all. How many nickels and how many quarters did she have? Wh

dybincka [34]

Answer:

she has 6 quarters and 2 nickels

Step-by-step explanation:

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3 years ago

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All 6 members of a family work. Their hourly wages (in dollars) are the following.37, 38, 39, 40, 39, 11Assuming that these wage

tiny-mole [99]

We have a sample that in fact represents the population.

We have to calculate the standard deviation of this population.

The difference between the standard deviation of a population comparing it to the calculation of the standard deviation of a sample is that we divide by the population side n instead of (n-1).

We have to start by calculating the mean of the population first:

$\begin{gathered} \mu=\dfrac{1}{n}\sum ^n_{i=1}\, x_i \\ \mu=\dfrac{1}{6}(37+38+39+40+39+11) \\ \mu=\dfrac{204}{6} \\ \mu=34 \end{gathered}$

Now, we can calculate the standard deviation as:

$\sigma=\sqrt[]{\dfrac{1}{n}\sum^n_{i=1}\, (x_i-\mu)^2}$ $\begin{gathered} \sigma=\sqrt[]{\dfrac{1}{6}((37-34)^2+(38-34)^2+(39-34)^2+(40-34)^2+(39-34)^2+(11-34)^2)} \\ \sigma=\sqrt[]{\frac{1}{6}(3^2+4^2+5^2+6^2+5^2+(-23)^2)} \\ \sigma=\sqrt[]{\frac{1}{6}(9+16+25+36+25+529)} \\ \sigma=\sqrt[]{\frac{1}{6}(640)} \\ \sigma\approx\sqrt[]{106.67} \\ \sigma\approx10.33 \end{gathered}$

Answer: the standard deviation of this population is approximately 10.33

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2 years ago

How do you draw 68 degrees on a protractor but without a protractor?

postnew [5]

If you are talking about a paper protractor you would put a line on 0 degrees and a line on 68 degrees. Same as a real one.

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3 years ago

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BRAINLIEST + 20 POINTS!!! plz help

Citrus2011 [14]

Answer:

Step-by-step explanation:

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3 years ago

In a class of 777, there are 333 students who have done their homework.

Genrish500 [490]

Answer:

57%

Step-by-step explanation:

333/777

= .43

1.0 - .43

= .57

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3 years ago