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3 years ago

Which expression is equivalent to 3(x – 6) + 5(x – 4)? A. 8x – 10 B. 15x2 – 38x C. 8x – 38 D. 9x – 22

Mathematics

2 answers:

Paul [167]3 years ago

7 0

Answer:

C. 8x – 38

Step-by-step explanation:

he equation.

All the options have the parenthesis solves, with all the numbers distribute, so first, you need to do that.

$3(x – 6) + 5(x – 4)=$

$(3*x) - (3*6) + (5*x) -(4*5)=$

now, solve what you can

$3*x=3x\\3*6=18\\5*x=5x\\4*5=20$

And put it all together

$3x - 18 + 5x - 20$

You can link the X therms and the no X terms

$(3x + 5x) =8x\\(-18 - 20) =-38$

And the final equation is: 8x - 38

sesenic [268]3 years ago

3 0

The answer is C.

3(x-6)+5(x-4) = 3•x+3•-6 = 3x-18 and 5•x+5•-4 = 5x-20

3x-18+5x-20

3x+5x = 8x and -18+-20 = -38

Which gives you...

8x-38

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Step-by-step explanation:

For this case we have the following data:

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$s^2 = \frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}$

But we need to calculate the mean with the following formula:

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And thi is the best estimator for the population variance since is an unbiased estimator od the population variance $\sigma^2$

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