3 years ago

The sales tax for an item was $19.50 and it cost $390 before tax.

Mathematics

1 answer:

AnnZ [28]3 years ago

7 0

Answer:

I don't know.........................

You might be interested in

Using the expression 4y + 18, identify the following:

rusak2 [61]

Answer:

The variable is y

The coefficient is 4

The constant is 18

4 0

3 years ago

Read 2 more answers

I need help !!!!!!!!!!!

Anna71 [15]

I cant see the picture

4 0

3 years ago

Read 2 more answers

Write an absolute value equation that has the solutions x=−6 and x=10

Dimas [21]

$x^{2} +6x-60=0$

3 0

3 years ago

I can't solve number 12. If you solve the others, much appreciated.

saul85 [17]

Answer is 18 due to the theory cause

5 0

2 years ago

We wish to construct a 90% confidence interval on the mean of a population known to be normally distributed based on a sample of

sergiy2304 [10]

Answer:

Margin of error = 0.773

Step-by-step explanation:

We are given the following information in the question.

Sample size, n = 20

Sample mean = 8

Sample standard deviation = 2

90% Confidence interval

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 19 and}~\alpha_{0.10} = \pm 1.729$

Margin of error:

$t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$1.729(\frac{2}{\sqrt{20}} ) = 0.773$

7 0

4 years ago