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4 years ago

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Can you help me plz .

1 answer:

Scilla [17]4 years ago

8 0

Solve for x:(2 x + 3)/3 - 1 = 10
Put each term in (2 x + 3)/3 - 1 over the common denominator 3: (2 x + 3)/3 - 1 = (2 x + 3)/3 - (3)/3:(2 x + 3)/3 - (3)/3 = 10
(2 x + 3)/3 - (3)/3 = ((2 x + 3) - 3)/3:(-3 + 3 + 2 x)/3 = 10
Add like terms. 3 - 3 = 0:(2 x)/3 = 10
Multiply both sides of (2 x)/3 = 10 by 3/2:(3×2 x)/(2×3) = (3×10)/2
(3×10)/2 = (3×10)/2:(3×2 x)/(2×3) = (3×10)/2
(3×2 x)/(2×3) = (2×3)/(2×3)×x = x:x = (3×10)/2
10/2 = (2×5)/2 = 5:x = 3×5
3×5 = 15:Answer: x = 15

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V125BC [204]

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Step-by-step explanation:

12/18=(x-1)/(x+3)

cross multiply

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3 years ago

jek_recluse [69]

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2 years ago

Suppose that a fast food restaurant decides to survey its customers to gauge interest in a breakfast menu. After surveying multi

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Answer:

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Step-by-step explanation:

For this case we want to find a confidence interval for the proportion of customers interested in a breakfast menu.

The confidence interval for this case is given by this formula:

$\hat p \pm z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}$

And the margin of error is given by:

$ME = z_{\alpha/2} \sqrt{\frac{\hat p(1-\hat p)}{n}}$

The 95% confidence for this case is given by:

$0.688 \leq p \leq 0.766$

We can find the point of estimate for the proportion using the fact that the interval is symmetrical

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And we can find the margin of error with this difference:

$ME = Upper- \hat p = 0.766-0.727 = 0.039$

Or equivalently with:

$ME = \hat p -Lower = 0.727- 0.688 =0.039$

So then the final answer for this case would be:

$\hat p = 0.727$ point of estimate for the proportion of customers interested in a breakfast menu

$ME= 0.039$ represent the margin of error.

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Step-by-step explanation:

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(x, y) → (x - 2, y + 3)

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3 years ago

What does it mean to evaluate an expression in math?

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3 years ago

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