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4 years ago

2. A varies directly as b. If A = 3 when b = 24, find b when A = 10.

Mathematics

1 answer:

Debora [2.8K]4 years ago

7 0

Should be 55 because they are inversely with x

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A class survey in a large class for first-year college students asked, “About how many minutes do you study on a typical weeknig

Anika [276]

Answer: (110.22, 125.78)

Step-by-step explanation:

The confidence interval for the population mean is given by :-

$\mu\ \pm z_{\alpha/2}\times\dfrac{\sigma}{\sqrt{n}}$

Given : Sample size = 463

$\mu=118\text{ minutes}$

$\sigma=65\text{ minutes}$

Significance level : $\alpha=1-0.99=0.01$

Critical value : $z_{\alpha/2}=z_{0.005}=\pm2.576$

We assume that the population is normally distributed.

Now, the 90% confidence interval for the population mean will be :-

$118\ \pm\ 2.576\times\dfrac{65}{\sqrt{463}} \\\\\approx118\pm7.78=(118-7.78\ ,\ 118+7.78)=(110.22,\ 125.78)$

Hence, 99% confidence interval for the mean study time of all first-year students = (110.22, 125.78)

3 0

4 years ago

Denise Robb's account statement shows a $210.94 unpaid balance. With a periodic rate of 1.85%, what is the finance charge? She h

Blizzard [7]

Answer:

A) 3.9 dollars

B) 126.38 dollars

Step-by-step explanation:

Given that Denise Robb's account statement shows a $210.94 unpaid balance. With a periodic rate of 1.85%

The finance charge = 1.85/100 × 210.94 = 3.9 dollars

If She had new purchases of $341.22. The new balance will be

341.22 - ( 210.94 + 3.9 )

126.38 dollars

8 0

4 years ago

Rob is a high school student taking both algebra and geometry. Last night he had 27 homework problems combined from the two clas

azamat

Answer:

Step-by-step explanation:

Let x represent the number of algebra problems. Then the number of geometry problems was 27-x and the total working time was ...

2x +5(27 -x) = 90

-3x = 90 -135 . . . . subtract 135

x = -45/-3 = 15 . . . divide by -3

Rob had 15 algebra problems for homework.

8 0

3 years ago

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John saves N$ 4225 the first month and every month later decreases it by N$ 65. How much will much John save in the 13th month?

castortr0y [4]

Answer:

nadaa

Step-by-step explanation:

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3 years ago

Only answer if you know this if i see a link its a report<br> ∞√5±x+5√15x+∞=

fenix001 [56]

Answer:

the exact form is 2/5. the decimal form is 0.4 ig

Step-by-step explanation:

8 0

3 years ago

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