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Arlecino [84]
3 years ago
9

Alexandra read a total of 22 books from the public library this summer. She read three books each week, and at the end of the su

mmer, She read three books each week, and at the end of the summer, there were 4 books she hadn't read. create an equation that would help you determine the number of weeks Alexandria read for this summer and solve.
Mathematics
2 answers:
Solnce55 [7]3 years ago
8 0

Answer:

6 Weeks

Step-by-step explanation:

Total number of books read 22

3 books each week

4 books she hasn't read

22-4=18  18/3= 6 weeks

Nimfa-mama [501]3 years ago
3 0

Answer:

Equation is 3x + 4 = 22

x = 6

Number of weeks she read is 6.

Step-by-step explanation:

Let x be the number of weeks she read.

Total number of books = 22

Each week she reads 3 books.

After x weeks the number of books left unread = 4

Number of books read in x weeks = 3x

Total number of books = number of books read in x weeks + number of books left unread after x weeks.

22 = 3x + 4

3x = 18

x = 6

Hence number of weeks she read is 6.

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The following table shows the estimated populations and annual growth rates for four countries in the year 2000. Find the expect
Softa [21]

Answer:

For Australia: 22,044,350

For China: 1,545,744,200

For Mexico: 145,507,500

For Zaire: 92,237,875

Step-by-step explanation:

For Australia: Population in 2000 is 19,169,000 and it is increasing steadily at a rate of 0.6% per year.

Therefore, the population in the year 2025 will be  

19169000[1+\frac{0.6 \times 25}{100} ]= 22,044,350 (Answer)

For China: Population in 2000 is 1,261,832,000 and it is increasing steadily at a rate of 0.9% per year.

Therefore, the population in the year 2025 will be  

1261832000[1+\frac{0.9 \times 25}{100} ]= 1,545,744,200 (Answer)

For Mexico: Population in 2000 is 100,350,000 and it is increasing steadily at a rate of 1.8% per year.

Therefore, the population in the year 2025 will be

100350000[1+\frac{1.8 \times 25}{100} ]= 145,507,500 (Answer)

For Zaire: Population in 2000 is 51,965,000 and it is increasing steadily at a rate of 3.1% per year.

Therefore, the population in the year 2025 will be

51965000[1+\frac{3.1 \times 25}{100} ]= 92,237,875 (Answer)

5 0
3 years ago
Find the equation of the line.<br> Use exact numbers.
expeople1 [14]

Answer:

y=2/3x+4

Step-by-step explanation:

rise 2

run 3

y-intercept 4

7 0
2 years ago
Read 2 more answers
PLZ HELP ASAP ILL MARK BRAINLIEST!
icang [17]

Polynomial degree : 2

Leading coefficient : 11

7 0
3 years ago
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The area of a circle is 77.28m2.<br> Find the length of the diameter rounded to 1 DP.
allochka39001 [22]

Answer:diameter=9.92m

Step-by-step explanation:

Area=77.28

π=3.14

Area=π x (d/2)^2

77.28=3.14 x (d/2)^2

Divide both sides by 3.14

77.28/3.14=(3.14x(d/2)^2)/3.14

24.6=(d/2)^2

Take them square root of both sides we get

d/2=√(24.6)

d/2=4.96

d=4.96 x 2

d=9.92

4 0
3 years ago
A pharmacist has an 18% alcohol solution and a 40% alcohol solution. How much of each should he mix together to make 10 liters o
TiliK225 [7]
Lets call x the amount of 18% solution and y the amount of 40% solution, and write as equations the info of the problem:
18x + 40y = 10(20)
x + y = 10
lets multiply the second equation by -18 and add to the first:
 18x + 40y = 200
-18x -<span> 18y = -180
</span>----------------------
0 + 22y = 20
y = 20/22 = 10/11
and substitute in the original equation:
x <span>+ y = 10
</span>x = 10 - y
x = 10 - 10/11
x = 110/11 - 10/11
x = 100/11
so they have to use 100/11 liters of 18% solution and 10/11 liters of 40% solution
3 0
3 years ago
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