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Maru [420]
3 years ago
7

If 17 men can complete a work

Mathematics
1 answer:
Vedmedyk [2.9K]3 years ago
4 0
13 people are required to do so
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The perimeter of a rectangle is 36m. If its length is increased by 1m and the width is increased by 2m, its area will increase b
maw [93]

Answer:

  80 m^2

Step-by-step explanation:

The given information lets you write two equations involving length (x) and width (y).

  • 2(x +y) = 36 . . . . the perimeter is 36 m
  • (x+1)(y+2) -xy = 30 . . . . increasing the length and width increases area

The second of these equations simplifies to another linear equation, giving a system of linear equations easily solved.

  xy +y +2x + 2 -xy = 30

  2x +y = 28 . . . . . . . subtract 2

Dividing the first equation by 2 gives

  x +y = 18

and subtracting this from the above equation gives ...

  (2x +y) -(x +y) = 28 -18

  x = 10

Then

  y = 18 -10 = 8

The area of the original rectangle is xy = 10·8 = 80 m^2.

4 0
3 years ago
Select all of the following points that lie on the graph of f(x) = 7 - 3x.
Mila [183]

Answer:

All of the points lie on the graph except for the coordinates (-2,1) and (1,5)

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Maria has the following numbers of books in her collection.
Ket [755]

Answer:

The average goes up by 0.6.

Step-by-step explanation:

The average of the original data set, 6,6,7,8,9 is 7.2. The average of the new data set with 3 more cookbooks 6,7,8,9,9 is 7.8. Therefore it increases by 0.6, hope that makes sense :)

7 0
2 years ago
Kit gathered 5 eggs when she visited her cousin's farm. Altogether, the eggs weighed 225.0 grams. She wrote down the weight of e
AfilCa [17]
Easy, all you have to do is add the eggs which she got the grams for (178.7)

Then, subtract 178.7g. from 225.0g. (46.3)

Then just put the eggs according from least to greatest:
 
1st egg:43.98

2nd egg:45.02

3rd egg:45.07

4th egg:45.72

5th egg:46.3

Hope this helps!

8 0
3 years ago
Read 2 more answers
What is equal to 6,530,000,000?
dsp73
Gee wiz man I don't know. that is a really big number. have you tried google? :/
5 0
3 years ago
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