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Vikki [24]
3 years ago
5

Leslie and her family went out to dinner last night. The total bill was $78.44 after the 6% tax. How much was the bill before ta

x?
Mathematics
1 answer:
sleet_krkn [62]3 years ago
5 0

Answer:

$74

Step-by-step explanation:

you convert the percent to a decimal, .06, and try multiplying it with the numbers before 78, so you multiply it with 77, 76, 75, then 74, and when you multiply it with 74 you get 78.44.

Or you figure out the total amount money wise that the tax would count as and subtract that from 78.44.

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An unconfined compression test was performed to determine the average strength of concrete cylinders (in psi). It is believed th
Ronch [10]

Answer:

Explained below.

Step-by-step explanation:

(1)

The confidence level is, 91%.

Compute the value of α as follows:

\text{Confidence level}\% =(100-\alpha \%)\\\\91% = 100-\alpha \%\\\\\alpha \%=100-91\%\\\\\alpha \%=9\%\\\\\alpha =0.09

(2)

As the population standard deviation is provided, i.e. <em>σ</em> = 256 psi, the <em>z</em> value would be appropriate.

The <em>z</em> value for α = 0.09 is,

<em>z</em> = 1.69

(3)

Compute the 91% confidence interval as follows:

CI=\bar x\pm z_{\alpha/2}\cdot\frac{\sigma}{\sqrt{n}}

     =3000\pm 1.69\cdot\frac{256}{\sqrt{70}}\\\\=3000\pm 51.71\\\\=(2942.29, 3057.71)

(4)

The 91% confidence interval for population mean implies that there is a 0.91 probability that the true value of the mean is included in the interval, (2942.29, 3057.71) psi.

8 0
2 years ago
I start with 8 grapes in my yard. The grapes triple every week. In how many weeks will there be 320 grapes in my yard (rounded t
REY [17]
U think it’s 40 cuz 8 x40 equal 320 ;-; if it’s wrong my name will come to use
4 0
3 years ago
The cost of health insurance is $1,200 per year. The cost of an operation for a dramatic injury is $500,000. The chances of some
SIZIF [17.4K]

Answer:

yes. The cost of the insurance is less than the probability cost of the operation

Step-by-step explanation:

yes. The cost of the insurance is less than the probability cost of the operation

The cost of health insurance = $1200

Cost of dramatic injury operation= $500,000

chances of need of operation= 47.3% over a 20 years period

the amount of pay insurance after 20 years= 20\times 1200= 240,00

probable  of cost operation= 0.473*500,00= $236,500

clearly the cost of insurance is less than the probable  cost of operation.

5 0
3 years ago
If a pound of bread is worth 1.75 and a orange is worth 0.50 per pound. How many pounds of oranges have an equivalent cost to 3
Alexus [3.1K]

Answer:

  C.  10.5 pounds

Step-by-step explanation:

The worth of 3 loaves of bread is 3 times that of one loaf:

  3 × 1.75 = 5.25

You want the number of pounds of oranges (p) at 0.50 per pound that has this same worth:

  0.50p = 5.25

  p = 5.25/0.50 = 10.50

10.5 pounds of oranges have an equivalent cost to 3 loaves of bread.

5 0
3 years ago
Name the theorem or postulate that can be used to prove that these triangles are similar
Musya8 [376]

Answer:SAS

Step-by-step explanation:Similar triangles are easy to identify because you can apply three theorems specific to triangles. These three theorems, known as Angle - Angle (AA), Side - Angle - Side (SAS), and Side - Side - Side (SSS), are foolproof methods for determining similarity in triangles.

5 0
3 years ago
Read 2 more answers
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