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2 years ago

Add (-3-7) + (4x + 7)

Mathematics

2 answers:

Naya [18.7K]2 years ago

7 0

Answer:

4x-3

Step-by-step explanation:

First, you Subtract the numbers

(-3-7)+(4x+7)

(-10)+(4x+7)

Then you add the numbers

-10+4x+7

-3+4x

Finally, you rearrange the numbers

-3+4x

4x-3

alexira [117]2 years ago

3 0

Answer:

Step-by-step explanation:

(-3x - 7) + (4x + 7)

Combine like terms

4x + 7

-3x - 7

(-3x - 7) + (4x + 7) = x

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In a metal fabrication process, metal rods are produced to a specified target length of 15 feet. Suppose that the lengths are n

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Answer:

95% Confidence interval: (14.4537 ,15.1463)

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 15 feet

Sample mean, $\bar{x}$ = 14.8 feet

Sample size, n = 16

Alpha, α = 0.05

Sample standard deviation, σ = 0.65 feet

Degree of freedom = n - 1 = 15

95% Confidence interval:

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 15 and}~\alpha_{0.05} = \pm 2.1314$

$14.8 \pm 2.1314(\dfrac{0.65}{\sqrt{16}} ) \\\\= 14.8 \pm 0.3463 = (14.4537 ,15.1463)$

is the required confidence interval for the true mean length of rods.

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