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3 years ago

What is 2x + 3x + 4x + 5x + 6x + 7x + 8x X 457 I really need help with this

Mathematics

2 answers:

Serggg [28]3 years ago

7 0

You just add up all of the x times by 457, since you combine like terms.

butalik [34]3 years ago

5 0

2x + 3x = 5x + 4x = 9x + 5x = 14x + 6x = 20x + 7x = 27x + 8x = 35x divide 457 =
X = 13

OR

35 x 457 = 15,995

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lakkis [162]

Answer:

1. (28-2)x

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Step-by-step explanation:

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3 years ago

Solve for x x - 20 + 2x = 35

Tanya [424]

$\sf{\red{ANSWER \: \: :}}$

x = 18 1/3

$\sf{\purple{EXPLANATION \: \: :}}$

x - 20 + 2x = 35

- 20 + 3x = 35

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1 year ago

What is 0.057×10 equal

lbvjy [14]

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3 years ago

A simple random sample of size nequals40 is drawn from a population. The sample mean is found to be 103.9, and the sample stand

yan [13]

Answer:

There is enough evidence to support the claim that the population mean is greater than 100

Step-by-step explanation:

Step 1: We state the hypothesis and identify the claim

$H_0:\mu=100$ and $H_1:\mu \:>\:100$ (claim)

Step 2: Calculate the test value.

$t=\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$

$\implies t=\frac{103.9-100}{\frac{21.9}{\sqrt{40} } }=1.1263$

Step 3: Find the P-value. The p-value obtained from a calculator is using d.f=39 and test-value 1.126 is 0.134

Step 4: We fail to reject the null hypothesis since P-value is greater that the alpha level. (0.134>0.05).

Step 5: There is enough evidence to support the claim that the population mean is greater than 100.

Alternatively: We could also calculate the critical value to obtain +1.685 for $\alpha=0.05$ and d.f=39 and compare to the test-value:

The critical value (1.685>1.126) falls in the non-rejection region. See attachment.

NB: The t- distribution must be used because the population standard deviation is not known.

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3 years ago