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Oliga [24]
3 years ago
8

What is 1(4x+7y)+2(5y-9x)​

Mathematics
1 answer:
patriot [66]3 years ago
3 0
1(4x+7y)+2(5y-9x)
=4x+7y+10y-18x
=-14x+17y

The solution is -14x+17y.
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A random sample of 64 freshmen spent an average of 14 hours per week watching television. the sample standard deviation was 32 h
NemiM [27]

Answer:

+/- 1.9983

Step-by-step explanation:

The critical values for a confidence interval for the population mean, with population standard deviation not known, are obtained from the student's t distribution.

The sample size is given as 64. The degrees of freedom will thus be;

sample size - 1 = 64 - 1 = 63

The confidence level is given as 95%. The level of significance will thus be;

100 - 95 = 5%.

The area in the right-tail will thus be 2.5%. Therefore, we looking for a t-value such that the area to its right is 2.5% and the degrees of freedom being 63. From the t-tables we have;

+/- 1.9983

3 0
3 years ago
Simplify the ratios 15:35:40​
Arturiano [62]
3:7:8 (divide each number for five)
3 0
4 years ago
Does anyone know how to do this I’m really confused
Levart [38]
<h3>Given:</h3>
  • Pentagon
<h3>To find:</h3>

The size of the unknown angle "x"

<h3>Solution:</h3>

The given polygon is a Pentagon so the sum of interior angle will be,

\large\boxed{Formula: ( n − 2 ) × 180}

n means the number of sides

Let's substitute the values according to the formula.

(5-2)×180

=540°

Now, we can find the sum of one interior angle.

\large\boxed{\frac{sum \: of \: interior \: angles}{n}}

n means the number of sides.

Let's substitute the values according to the formula.

x=\frac{540}{5}

\large\boxed{x= 108°}

<u>Therefore</u><u>,</u><u> </u><u>the</u><u> </u><u>size</u><u> </u><u>of</u><u> </u><u>the</u><u> </u><u>unknown</u><u> </u><u>angle</u><u> </u><u>"</u><u>x"</u><u> </u><u>is</u><u> </u><u>1</u><u>0</u><u>8</u><u>°</u>

4 0
3 years ago
The base of a rectangular prism has a base of 15 square cm. The height of the prism is 5 cm. What is the volume of the rectangul
kaheart [24]

Step-by-step explanation:

eyeyeyeyeyyeyeyeyeeyeyeueueuryryru

7 0
3 years ago
Which number completes the Pythagorean Triple of 14, 48, x?
kykrilka [37]
<h3>Answer:</h3>

50

<h3>Step-by-step explanation:</h3>

These numbers are double those of the (7, 24, 25) triple. 2×25 = 50.

You can also figure it out from ...

... x = √(14² +48²) = √(196 +2304) = √2500 = 50

3 0
3 years ago
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