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3 years ago

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Cynthia beach wants to buy a rug for a room that is 18 ft wide and 32 long. She wants to leave a uniform strip of floor around t

he rug. She can afford to buy 176 square feet of carpeting. What dimensions should the rug have

1 answer:

igomit [66]3 years ago

3 0

Answer:

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Step-by-step explanation:

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I'LL GIVE BRAINLIEST IF YOU EXPLAIN THE ANSWER:

USPshnik [31]

Answer:

C) 16 cm^2

Step-by-step explanation:

scale is 1:8 so 2 cm^2x8=16

6 0

2 years ago

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Researchers conducted a study to determine whether magnets are effective in treating back pain. Pain was measured using the visu

Kay [80]

Answer:

10 step

Step-by-step explanation:

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2 years ago

A recipe requires 3 cups of flour to make 27 dinner rolls. How much flour is needed to make 9 rolls.

amid [387]

9 rolls* (3 cups of flour/ 27 dinner rolls)= 1 cup of flour.

1 cup of flour is needed to make 9 rolls~

5 0

3 years ago

2. A chemist has a 25% and a 50% acid solution. How

AnnZ [28]

Answer:

x is mL of 25% acid and y is mL of 50% acid

We set up 2 equations:

A) x + y = 250

B) .25 x + .50y = .35 * 250 which equals

B) .25x + .50y = 87.50 Multiplying A) by -.5

A) -.5x -.5y = -125 adding the equations we get

-.25x = -37.50

x = 150 mL

y = 100 mL

Source: http://www.1728.org/mixture.htm

Step-by-step explanation:

7 0

2 years ago

Use the standard norml distribution or the t-distribution to construct a 99% confidence interval for the population mean. Justif

dalvyx [7]

Answer:

E) we will use t- distribution because is un-known,n<30

the confidence interval is (0.0338,0.0392)

Step-by-step explanation:

<u>Step:-1</u>

Given sample size is n = 23<30 mortgage institutions

The mean interest rate 'x' = 0.0365

The standard deviation 'S' = 0.0046

the degree of freedom = n-1 = 23-1=22

99% of confidence intervals $t_{0.01} =2.82$ (from tabulated value).

$The mean value = 0.0365$

$x±t_{0.01} \frac{S}{\sqrt{n-1} }$

$0.0365±2.82 \frac{0.0046}{\sqrt{23-1} }$

$0.0365±2.82 \frac{0.0046}{\sqrt{22} }$

$0.0365±2.82 \frac{0.0046}{4.690 }$

using calculator

$0.0365±0.00276$

Confidence interval is

$(0.0365-0.00276,0.0365+0.00276)$

$(0.0338,0.0392)$

the mean value is lies between in this confidence interval

(0.0338,0.0392).

<u>Answer:-</u>

<u>using t- distribution because is unknown,n<30,and the interest rates are not normally distributed.</u>

4 0

2 years ago