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omeli [17]
2 years ago
6

5. On the fifth day of my winter break, I got five golden rings. BUT—— the golden rings were five separate water rings around my

hot tub caused by too high a concentration of iron in the water. The radius of my cylindrical hot tub is 3 feet. How many feet of “golden ring” did I have to scrub off the hot tub? Round to nearest foot.
Mathematics
1 answer:
kvv77 [185]2 years ago
4 0

Answer:

Step-by-step explanation:

1 ring has a radius of 3 feet

1 ring has a circumfrence of 2*pi*r = 2 * 3.14 * 5 = 10*Pi

5 rings would have a length of 50 * pi length = 50*3.14 = 157 feet

That's a lot of Brillo pads.

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Natali5045456 [20]
She gets a talk time of 160/40 = 4
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2 years ago
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Pat paid $85.50 for renting a scooter for 6 hours. What was the rate per hour for renting the scooter?
enyata [817]

Answer:

14.25

Step-by-step explanation:

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5 0
2 years ago
Suppose that scores on an aptitude test are normally distributed with a mean of 100 and a standard deviation of 4.6. Scores on a
DerKrebs [107]

Answer:

<u>The correct answer is C. Felix's z-score on the aptitude test was 1.30. His z-score on the knowledge test was 2.08. Felix performed better on the knowledge test, comparatively.</u>

Step-by-step explanation:

1. Let's check all the information given to us to answer the question correctly:

Mean of the scores on the aptitude test = 100

Standard deviation of the aptitude test = 4.6

Felix's score on the aptitude test = 106

Mean of the scores on the knowledge test = 70

Standard deviation of the knowledge test = 2.4

Felix's score on the knowledge test = 75

2. Which statement best describes Felix's scores on the two tests comparatively?

Let's recall that z-score in a normal distribution, positive or negative, is the number of times of the standard deviation a certain element is from the mean. If the element is below the mean, then the z-score is negative and if it's above the mean, then the z-score is positive.

Therefore, a score of 106 on the aptitude test, will have the following z-score:

106 - 100 = 6 and it's above the mean.

Now, we calculate the z-score, using the value of the standard deviation this way:

6/4.6 = 1.30

A score of 75 on the knowledge test, will have the following z-score:

75 - 70 = 5 and it's above the mean.

Now, we calculate the z-score, using the value of the standard deviation this way:

5/2.4 = 2.08

The z-scores of Felix were 1.30 on the aptitude test and 2.08 on the knowledge test. He performed better on the aptitude test because 2.08 > 1.30, so the correct statement that best describes Felix's scores on the two tests comparatively is<u> C. Felix's z-score on the aptitude test was 1.30. His z-score on the knowledge test was 2.08. Felix performed better on the knowledge test, comparatively.</u>

6 0
3 years ago
Do the rational numbers form a finite set?
zysi [14]
Yea because the rationl numbers are diffrent form as a finite set 

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Andre45 [30]

Answer:

x=6; y=-3 (6;-3)

Step-by-step explanation:

9x=54

x=6

If you substitute...y= -3

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