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3 years ago

You bought items at Best Buy that rang up $143.75. You have a 30% discount and have to pay 9.5% sales tax.

Mathematics

2 answers:

Lena [83]3 years ago

5 0

Answer:

Around $110

Step-by-step explanation:

30% discount means 70% is to be paid

70/100 × 143.75

100.625

9.5% means 109.5% of 100.625 to be paid

109.5/100 × 100.625

= 110.184375

Around $110

Mandarinka [93]3 years ago

3 0

Answer:

$92.33

Step-by-step explanation:

You take 143.75 and multiply by .3 to find the amount you will discount from 145.75, to get 102.025. Then multiply that by .095 to get 9.692375. Subtract that from 102.025 to get 92.33.

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Round 251,031 to the nearest thousand

Soloha48 [4]

251,000 For this check the hundreds, tens, ones. If it's 500 of more round it up

3 0

3 years ago

Read 2 more answers

A researcher compares the effectiveness of two different instructional methods for teaching electronics. A sample of 138 student

yan [13]

Answer:

The 98% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2 is (-8.04, 0.84).

Step-by-step explanation:

The (1 - <em>α</em>)% confidence interval for the difference between population means is:

$CI=(\bar x_{1}-\bar x_{2})\pm z_{\alpha/2}\times \sqrt{\frac{\sigma^{2}_{1}}{n_{1}}+\frac{\sigma^{2}_{2}}{n_{2}}}$

The information provided is as follows:

$n_{1}= 138\\n_{2}=156\\\bar x_{1}=61\\\bar x_{2}=64.6\\\sigma_{1}=18.53\\\sigma_{2}=13.43$

The critical value of <em>z</em> for 98% confidence level is,

$z_{\alpha/2}=z_{0.02/2}=2.326$

Compute the 98% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2 as follows:

$CI=(\bar x_{1}-\bar x_{2})\pm z_{\alpha/2}\times \sqrt{\frac{\sigma^{2}_{1}}{n_{1}}+\frac{\sigma^{2}_{2}}{n_{2}}}$

$=(61-64.6)\pm 2.326\times\sqrt{\frac{(18.53)^{2}}{138}+\frac{(13.43)^{2}}{156}}\\\\=-3.6\pm 4.4404\\\\=(-8.0404, 0.8404)\\\\\approx (-8.04, 0.84)$

Thus, the 98% confidence interval for the true difference between testing averages for students using Method 1 and students using Method 2 is (-8.04, 0.84).

5 0

3 years ago

I need help creating a real world problem

marshall27 [118]

Jasmine goes to McDonalds to order food. A big mac costs $5 and large fries cost $3. If Jasmine was to buy one big mac with one batch of large fries, how much would she pay in total if a taxes of $10 was added on.

Answer: 5+3=8
8+10=18

The answer is $18 dollars.

7 0

3 years ago

Which of the following rational functions is graphed below?

solong [7]

Answer:

Option C

Step-by-step explanation:

According to the graph, there are vertical asymptotes at $x=-3$ and $x=7$ . Therefore, C is correct because -3+3=0 and 7-7=0.