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joja [24]
3 years ago
11

In January, a bookstore sells 450 books, but in February, it sells only 300 books. What is the percent of change from January to

February?
Mathematics
1 answer:
Salsk061 [2.6K]3 years ago
8 0
300*1.5 = 450
450/1.5=300

Answer 1.5% percent of change 
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Find the population standard deviation (σ not S) for the data set: {75,80,90,95,75,85,55,80,90,95}
Marianna [84]
The steps to work out standard deviation is as follows

Step 1: Find the mean of the data

\frac{75+80+90+95+75+85+55+80+90+95}{10}=82

Step 2: Subtract the mean from each data value

75-82=-7
80-82=-2
90-82=7
95-82=13
75-82=-7
85-82=3
55-82=-27
80-82=-2
90-82=8
95-82=13

Step 3: Add up the answers from step 2\sqrt{2.9}=1.7

-2+(-2)+7+13+(-7)+3+(-2)+(-2)+8+13=29

Step 4: Divide the answer is step 3 by the number of data

\frac{29}{10}=2.9

Step 5: Square root the answer in step 4

\sqrt{2.9} =1.7


5 0
4 years ago
3. At the school carnival, students sold 483 hamburgers for $4 each and 214 hot dog
Brrunno [24]

Step-by-step explanation:

I think the equation should be

483 x 4 = h

1932 = h

8 0
3 years ago
How would you explain the relationship between an exponential function and a logarithmic function to an English major you are tu
natima [27]
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A cup of Kool-Aid has a mass of 700 grams. The cup by itself has a mass of 80 grams. If the cup has a diameter and a height of 8
Nezavi [6.7K]
I think the answer is 120
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What’s the correct answer for this?
Citrus2011 [14]

Answer:

the distance of the rope between boat and dock is 30

Step-by-step explanation:

to get the distance between the rope and the dock we use tan 40 because we have the opposite as 25.17ft

tan 40 = opposite/adjacent

0.839 = 25.17/a

cross multiply

0.839a= 25.17

a = 25.17/0.839 = 30 ft

7 0
3 years ago
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