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tangare [24]
3 years ago
8

Equations

Mathematics
2 answers:
Flauer [41]3 years ago
8 0

Answer:

Step-by-step explanation:

-3x + 4y = -18

8x - 4y =   28

5x = 10

x = 2

4 - y = 7

-y = 3

y = -3

(2, -3)

Savatey [412]3 years ago
7 0

Answer:

C is the answer

Step-by-step explanation:

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What doexs this equal: 3ab-9ab+7ab
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Answer:

I think that it equals 1ab. Because 3ab - 9ab= -6ab + 7ab= 1ab



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Dan pays £714.73 a year in his car insurance. The insurance company reduces the price by 4.1%. How much does the insurance cost
FrozenT [24]

Answer:

£682.57

Step-by-step explanation:

Dan pays £714.73 a year in his car insurance.

The price was reduced by 4.1%

To find the new cost of the insurance, we simply need to find 4.15% of £714.73 and then subtract that from the initial price of the insurance (£714.73)

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4 0
3 years ago
A random sample of 250 students at a university finds that these students take a mean of 15.3 credit hours per quarter with a st
SpyIntel [72]

Answer:  15.3\pm0.198

OR

(15.102, 15.498)

Step-by-step explanation:

The formula to find the confidence interval(\mu) is given by :-

\overline{x}\pm z_{\alpha/2, df}\dfrac{s}{\sqrt{n}}

, where n is the sample size

s = sample standard deviation.

\overline{x}= Sample mean

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Given : Confidence level = 95% = 0.95

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thus , \sigma=1.6

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z_{\alpha/2}=z_{0.025}=1.96

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15.3\pm (1.96)\dfrac{1.6}{\sqrt{250}}\\\\ =15.3\pm 0.19833\\\\=\approx15.3\pm0.198\\\\=(15.3-0.198,\ 15.3+0.198)=(15.102,\ 15.498)

Hence, the mean credit hours taken by a student each quarter using a 95% confidence interval. =(15.102, 15.498)

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If sales tax is 7%, what is the total cost of the<br> sweater that is 12.00
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