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olganol [36]
3 years ago
15

Solve each system of equations by adding.

Mathematics
1 answer:
Archy [21]3 years ago
8 0

Answer:

3.  x+y = -1

    x-y = 7

(x+x+y-y) 2x=6

x=3

4. 2x+2y = -2

   3x-2y = 12

(2x+3x+2y-2y) 5x=-2+12

5x=10

x= 2

5. 6x+5y = 4

  -6x+7y = 20

(6x-6x+5y+7y)= 4+20

12y=24

y=2

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Of the 725 students at Franklin Middle School, 12/25 play a sport. How many students play a sport at Franklin Middle School?
Paladinen [302]

Answer:

348 out of 725

Step-by-step explanation:

This is a ratio question, giving us a sample that we can use to extend the number to all students.

12/25 students play a sport so we want the value of x in x/725

So:

12/25 = x/725

Cross-Multiply:

25x = 8700

Divide by 25 to get x:

348

You can also check by dividing these ratios to see if you get the same number. In this case, you do (.48).

8 0
3 years ago
Find the perimeter of the shaded region
Bond [772]

Answer:

13 u²

Step-by-step explanation:

8 0
2 years ago
Subtract these sets of matrix
IrinaK [193]
The procedure is to make the difference of the terms that occupy the same position (column and row):

| - 6    - 4 |      | - 5    5 |              | - 6 + 5      - 4 - 5 |          | -1      - 9 |
| 6        0 |  -   | - 4   -1 |     =       |   6 + 4       0 + 1 |    =    | 10        1 |
| 6        4 |      | 6    - 4 |              |   6 - 6        4 + 4 |          |  0         8 |

Answer: option B.

8 0
3 years ago
I need help with Geometry
olga_2 [115]

Answer:

because this is a right triangle, we have''

\frac{1}{x^{2} }=\frac{1}{36.100}+\frac{1}{64.100}=\frac{1}{2304}\\\\=>x^{2}=2304\\\\ =>x=48

Step-by-step explanatio

8 0
2 years ago
Can someone pls help me . ASAPPP
STALIN [3.7K]

Volume without holes = 3 x 6 x 11 = 198 cubic inches.

Calculate volume of one hole:

3.14 x 0.5^2 x 3 = 2.355 cubic inches

There are 3 holes: 3 x 2.355 = 7.065

Subtract volume of the holes from the brick:

198 - 7.065 = 190.935 cubic inches.

Rounded to the nearest tenth: 190.9 cubic inches.

8 0
2 years ago
Read 2 more answers
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