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3 years ago

!!!!!I NEED HELP ASAP!!!!!

Mathematics

1 answer:

Tcecarenko [31]3 years ago

3 0

Answer:

Step-by-step explanation:

(-81)(-1) = 81

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Brooke cooked a 4/1/3-pound lasagna in 1/1/3 hours. How many hours per pound did it take to cook the lasagna?

Hitman42 [59]

Answer:

4/13 hours

Step-by-step explanation:

Total pounds of lasagna = 4 1/3 pounds

Total time taken to cook = 1 1/3 hours

How many hours per pound did it take to cook the lasagna?

Hours per pound of lasagna = Total time taken to cook / Total pounds of lasagna

= 1 1/3 hours ÷ 4 1/3 pounds

= 4/3 ÷ 13/3

= 4/3 × 3/13

= 4/13 hours

It will take 4/13 hours to cook each pound of the lasagna

3 0

4 years ago

What is the r-value of the following data, to three decimal places

Mrrafil [7]

<h2>Answer:</h2>

Option: A is the correct answer.

A. -0.903

<h2>Step-by-step explanation:</h2>

The formula to calculate correlation coefficient r is given by:

$r=\dfrac{n\sum xy-(\sum x)(\sum y)}{\sqrt{n(\sum x^2)-(\sum x)^2}\sqrt{n(\sum y^2)-(\sum y)^2}}$

x y xy x² y²

4 23 92 16 529

5 12 60 25 144

8 10 80 64 100

9 9 81 81 81

13 2 26 169 4

-------------------------------------------------------------------------

∑ 39 56 339 355 858

Also n=5 ( as there are 5 data points )

Hence, we get:

$r=\dfrac{5\times 339-39\times 56}{\sqrt{5\times 355-(39)^2}\times \sqrt{5\times 858-(56)^2}}\\\\\\r=\dfrac{-489}{\sqrt{254}\times \sqrt{1154}}\\$

$r=-\dfrac{489}{541.40188}=-0.9032$

Hence, the r-value of the following data, to three decimal places is:

A. -0.932

8 0

3 years ago

The number of calories burned at the gym is normally distributed with a mean of 425 and a standard deviation of 51. Find the Z-s

Galina-37 [17]

Answer:

(a) -3.708

(b) 1.706

(c) 0.490

Step-by-step explanation:

The z-score of normal distribution is given as:

$z=\frac{x-\mu}{\sigma}$

(a)

Given:

Score is, $x=268$

Mean value is, $\mu =425$

Standard deviation is, $\sigma = 51$

z-score is, $z=\frac{268-425}{51}=\frac{-157}{51}=-3.078$

(b)

Given:

Score is, $x=512$

Mean value is, $\mu =425$

Standard deviation is, $\sigma = 51$

z-score is, $z=\frac{512-425}{51}=\frac{87}{51}=1.706$

(c)

Given:

Score is, $x=450$

Mean value is, $\mu =425$

Standard deviation is, $\sigma = 51$

z-score is, $z=\frac{450-425}{51}=\frac{25}{51}=0.490$

6 0

3 years ago

Ty borrowed $500 from his parents.The graph shows how much he owes them each month if he pays back a certain amount each amount

Ganezh [65]

If he's paying $50 each month 500/50=10 so it'll take him 10 months

6 0

3 years ago

Mr. Grimm is trying to build a playground set in his backyard. Part of the playground set will have a slide. The ladder is 5 fee

pochemuha

Answer:

~5 feet.

Step-by-step explanation:

assuming that it is a right triangle. if a=5 and c=7 then b the other leg is equal to the square root of c squared minus a squared. which equals about 4.9

3 0

3 years ago

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