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VLD [36.1K]
2 years ago
8

Alma pays $26.88 each week for gas and $24.95 every three months to change the oil in her car. how much does Alma pay in total f

or these every year?
Mathematics
2 answers:
Andre45 [30]2 years ago
6 0

Answer:

$1497.56

Step-by-step explanation:

<em>There are 52 weeks in a year.</em>

$26.88 * 52 = $1397.76

<em>Alma pays $24.95 every 3 months on oil so she does this 4 times a year.</em>

$24.95 * 4 = $99.8

<u>$1397.76 + $99.8 = </u><u>$1497.56</u>

boyakko [2]2 years ago
4 0

Answer:

1,497.06  

Step-by-step explanation:

1,397.26 in gas, cuz 52 weeks in a year (sorry if I multiplied wrong), and $99.80 for oil, cuz 12 months in a year. So the total is 1,497.06

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7 0
3 years ago
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An automobile manufacturer has given its van a 59.5 miles/gallon (MPG) rating. An independent testing firm has been contracted t
LekaFEV [45]

Answer:

The pvalue of the test is 0.0124 < 0.1, which means that there is sufficient evidence at the 0.1 level to support the testing firm's claim.

Step-by-step explanation:

An automobile manufacturer has given its van a 59.5 miles/gallon (MPG) rating. An independent testing firm has been contracted to test the actual MPG for this van since it is believed that the van has an incorrect manufacturer's MPG rating:

At the null hypothesis, we test if the mean is the same, that is:

H_0: \mu = 59.5

At the alternate hypothesis, we test that it is different, that is:

H_a: \mu \neq 59.5

The test statistic is:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

In which X is the sample mean, \mu is the value tested at the null hypothesis, \sigma is the standard deviation and n is the size of the sample.

59.5 is tested at the null hypothesis:

This means that \mu = 59.5

After testing 250 vans, they found a mean MPG of 59.2. Assume the population standard deviation is known to be 1.9.

This means that n = 250, X = 59.2, \sigma = 1.9

Value of the test statistic:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

z = \frac{59.2 - 59.5}{\frac{1.9}{\sqrt{250}}}

z = -2.5

Pvalue of the test and decision:

The pvalue of the test is the probability of finding a mean that differs from 59.5 by at least 0.3, which is P(|Z|>-2.5), which is 2 multiplied by the pvalue of Z = -2.5.

Looking at the z-table, Z = -2.5 has a pvalue of 0.0062

2*0.0062 = 0.0124

The pvalue of the test is 0.0124 < 0.1, which means that there is sufficient evidence at the 0.1 level to support the testing firm's claim.

5 0
2 years ago
Trying to pass 7th grade
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The answer to this is B

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3 years ago
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lyudmila [28]
In each case, you can use the second equation to create an expression for y that will substitute into the first equation. Then you can write the result in standard form and use any of several means to find the number of solutions.

System A
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System B
  -6x +5 = x² -7x +10
  x² -x +5 = 0
The discriminant is ...
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System C
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7 0
2 years ago
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