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3 years ago

Solve for y a. 7 cmb. 20 cmc. 14 cmd. 10 cm

Mathematics

1 answer:

Rainbow [258]3 years ago

7 0

Answer:

20 cm

Step-by-step explanation:

We can use ratios to solve

We know x = 7 since they are of equal length

x x+7

----- = -------

10 y

7 7+7

----- = -------

10 y

Using cross products

7y = 14*10

7y = 140

Divide by 7

7y/7 = 140/7

y = 20

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The selling price of an item is $600. It is marked down by 10%, but this sale price is still marked up

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Step-by-step explanation:

Sale price

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2 years ago

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3 years ago

An automobile manufacturer has given its van a 47.2 miles/gallon (MPG) rating. An independent testing firm has been contracted t

7nadin3 [17]

Answer:

The test statistics is $t = -1.7$

The Null and Alternative hypothesis are

$H_o : \mu = 47.2$ and $H_a : \mu \ne 47.2$

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 47.2 miles/gallon(MPG)$

The sample size is $n = 250 \ van$

The sample mean is $\= x = 47.0$

The sample standard deviation is $\sigma = 1.9$

The level of significance is $\alpha = 0.02$

Given that the value which the manufacturer gave the automobile is 47.2 and it is believed that this is not correct, then

The Null Hypothesis is

$H_o : \mu = 47.2$

The alternative Hypothesis is

$H_a : \mu \ne 47.2$

The test statistics can be mathematically evaluated as

$t = \frac{\= x- \mu}{\frac{\sigma }{\sqrt{n} } }$

substituting values

$t = \frac{\= 47- 47.2}{\frac{1.9 }{\sqrt{250} } }$

$t = -1.7$

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3 years ago

find the interest earned on an account with $450 principal, and interest rate of 6% over a period of 8 years

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8
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3 years ago

7y(8y - 7) + 46y Please Simplify

Dafna1 [17]

Distribute first
a(b+c)=ab+ac
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now we have
56y^2-49y+46y
56y^2-3y
tada

6 0

3 years ago

Solve for y a. 7 cmb. 20 cmc. 14 cmd. 10 cm​

Solve for y a. 7 cmb. 20 cmc. 14 cmd. 10 cm