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3 years ago

Simplify the expression 2x - 4 + 3

Mathematics

2 answers:

Viktor [21]3 years ago

6 0

Combine like terms:
2x-4+3 --> 2x-1
answer:2x-1

Aleks04 [339]3 years ago

5 0

Ok......
2x - 4 + 3

Move the "-4" across the "+" adding it to the 3
That would give you a -1
So your answer would be
2x - 1

H0P3 It H3LPS :)

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What are the solutions to the equation x^2-8x=24

Oduvanchick [21]

$x^{2} - 8x = 24$

Transposing the equation to give zero on the RHS:
$x^{2} - 8x - 24 = 0$

Since we can't factorise it directly, we must complete the square to yield any solutions:
$x^{2} - 8x + ( \frac{8}{2})^2 - (\frac{8}{2})^2 - 24 = 0$
$(x^{2} - 8x + 16) - 16 - 24 = 0$
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$(x-4)^2 = 40$
$x-4 = +/- \sqrt{40}$ ––> because square rooting yields a positive and negative solution.
x = 4 +/- $\sqrt{40}$
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Step-by-step explanation:

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3 years ago

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Alinara [238K]

Answer:

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In a sample of 50 households, the mean number of hours spent on social networking sites during the month of January was 45 hours

WITCHER [35]

Answer:

D. The 95% confidence interval ranges from 42.78 to 47.22 hours.

Step-by-step explanation:

In a sample of 50 households, the mean number of hours spent on social networking sites during the month of January was 45 hours. In a much larger study, the standard deviation was determined to be 8 hours.

Here,

n = sample size = 50,

μ = mean = 45,

σ = standard deviation = 8,

We know that, confidence interval will be,

$=\mu\ \pm\ z\dfrac{\sigma }{\sqrt{n}}$