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3 years ago

I need help on #3 please help

Mathematics

2 answers:

Anna [14]3 years ago

6 0

Divide 72 by 4which would give u 18

Dafna1 [17]3 years ago

3 0

The answer is C

do 4 times 18 and it equals 72

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3 years ago

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Solve 2x + 4y = -8 and 4x + 8y = 5 by elimination. Please show work on how to get the answer.

goldfiish [28.3K]

Answer:

No solution

Step-by-step explanation:

Given two equations are 2x+4y= -8 and 4x+8y= 5

These two lines are parallel They don't have a solution because they do not meet .

Multiply the first equation by 2 we get 4x+8y = -16

the other equation is 4x+8y= 5 clearly these two are parallel .

To prove by elimination method we have subtract those two equations we get 21≠0 which is not possible.

Therefore there is no solution to the given set of equation.

5 0

3 years ago

1.62 was multiplied by a power of ten to get 16.2. What power of ten was it multiplied by?

dexar [7]

10 in the first power
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8 0

3 years ago

The diameter of a circle is 9 centimeters. Find the area to the nearest tenth.

Umnica [9.8K]

Answer:

63.6 square cm

Step-by-step explanation:

$d = 9 \: cm \implies \: r = 4.5 \: cm \\ area \: of \: circle \\ = \pi {r}^{2} \\ = 3.14 \times ( {4.5})^{2} \\ = 3.14 \times 20.25 \\ = 63.585 \\ = 63.6 \: {cm}^{2} \\$

8 0

3 years ago

A researcher analyzed the results of her data from 30 subjects and calculated the variance of scores at 113.00. What is the stan

Alla [95]

Answer:

10.63

Step-by-step explanation:

Data provided in the question

Data = 30 subjects

The Variance of scores = 113.00

The calculation of standard deviation is shown below:-

As we know that

Variance = Standard deviation^2

Therefore,

Standard deviation = $\sqrt{variance}$

= $\sqrt{113}$

= 10.63

Therefore for computing the standard deviation we simply applied the above formula.

8 0

3 years ago