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guapka [62]
3 years ago
9

Fred has a bag of coin with only nickels and quarters. He got $20 by

Mathematics
1 answer:
Sedbober [7]3 years ago
5 0

Answer:

75 quarters 25 nickels

Step-by-step explanation:

q=quarters n=nickels

q+n=100   n=100-q

0.25q +0.05(100-q)=20

From now I will multiply  by 100 to avoid decimals

25q + 5(100-q)=2000

20q=1500

q=75       n=25

75*0.25= 18.75

25*0.05=1.25

18.75+1.25=20

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A random sample of 17 hotels in Boston had an average nightly room rate of $165.40 with a sample standard deviation of $21.70. T
tensa zangetsu [6.8K]

Answer:

153.158 ; 177.642

Step-by-step explanation:

Given the following:

Sample mean (m) = 165.40

Sample standard deviation (s) = 21.70

Sample size (n) = 17

α = 98%

Confidence interval = m ± z(SE)

z at 98% = 2.326

SE = s/√n

SE = 21.70/√17 = 5.2630230

Hence,

Confidence interval = 165.40 ± 2.326(5.2630230)

165.40 - 12.241791498 OR 165.40 + 12.241791498

153.158 ; 177.642

3 0
3 years ago
Which of the following are equivalent to 140%?<br><br> 0.14<br> 5/7<br> 1 2/5<br> 1.4
Alika [10]
1.4

To make a percent a decimal, divide it by 100.

140 ÷ 100

= 1.4


♧
5 0
3 years ago
Can someone please help me please ?
SashulF [63]

Step-by-step explanation:

If you were to give them all the same denominator which is 32 that would be the greatest common denominator Then you would multiply the numerator by however many times it took you to get to the denominator and then you would put them in order from least to greatest while they all have the same denominator different numerators same denominator and then you would put him in order in the original way answer

5 0
3 years ago
Bo and Erica are yoga instructors. Between the two of them, they teach 33 yoga classes each week. If Erica teaches 15 fewer than
abruzzese [7]
9 i think is the answer
6 0
3 years ago
Read 2 more answers
The store bought a pair of shoes for $50, and sold it for $80. What percentage was the markup? PLZ HELPPP!!!
drek231 [11]

Answer:

37.5%

Step-by-step explanation:

The markup would be 37.5%. 80-50 = 30. If you set up the  

proportion, is/of = %/100, it would be 30/80 = %/100. Multiply  

30*100. = 3,000. Divide this by 80 and you get 37.5.

5 0
3 years ago
Read 2 more answers
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