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MA_775_DIABLO [31]
3 years ago
10

The total cost of Anja’s trip to the dentist was $628.35. She paid a flat fee of $89.95 which included the checkup and cleaning

and then had 4 cavities filled, each of which cost the same amount. Which shows the correct equation and value of x, the cost of each cavity filling?
4 x + 89.95 = 628.35; x = 134 dollars and 60 cents
4 (89.95) + x = 628.35; x = 268 dollars and 55 cents
4 x + 89.95 = 628.35; x = 179 dollars and 58 cents
4 (89.95) + x = 628.35; x = 538 dollars and 40 cents
Mathematics
2 answers:
suter [353]3 years ago
6 0

Answer:

The first one is right

Step-by-step explanation:

Roman55 [17]3 years ago
6 0

Answer:

A

p-by-step explanation:

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14

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The carpet would have to be 120 square feet.

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When 258 college students are randomly selected and surveyed, it is found that 106 own a car. Find a 99% confidence interval for
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Answer: 0.332 < p < 0.490

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\hat{p}\pm z^*\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}

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z* = critical z-value.

As per given , we have

n= 258

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Critical z-value for 99% confidence interval is 2.576. (By z-table)

Therefore , the  99% confidence interval for the true proportion(p) of all college students who own a car will be :0.411\pm (2.576)\sqrt{\dfrac{0.411(1-0.411)}{258}}\\\\=0.411\pm (2.576)\sqrt{0.00093829}\\\\= 0.411\pm (2.576)(0.0306315197142)\\\\=0.411\pm 0.0789=(0.411-0.0789,\ 0.411+0.0789)\\\\=(0.3321,\ 0.4899)\approx(0.332,\ 0.490)

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3 years ago
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