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skad [1K]
3 years ago
9

Help!! ...................................................................................

Mathematics
1 answer:
My name is Ann [436]3 years ago
4 0
I think you just need to multiply 100 and 2 then 30 times 1/2
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Solve the system of linear equations by elimination.<br> 9x+2y=39<br> 6x+13y=−9
vodomira [7]

y = -3

x = 5

Explanation:

9x + 2y = 39  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  (2)\\ 6x + 13y =  - 9 \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: ( - 3) \\  \\ 18x + 4y = 78 \\  - 18x - 39y = 27 \\  \\  - 35y = 105 \\ y =  \frac{105}{ - 35}  \\ y =  - 3 \\  \\  \\ 9x + 2y = 39 \\ 9x + 2( - 3) = 39 \\ 9x - 6 = 39 \\ 9x = 39 + 6 \\ 9x = 45 \\ x =  \frac{45}{9}  \\ x = 5

3 0
2 years ago
Find the surface area of the cube
Sergio039 [100]

Answer:

24 cm²

easy way to find surface area of a cube.

use the formula: 6a²

\hookrightarrow 6(2)^2

\hookrightarrow 6(4)

\hookrightarrow24

8 0
3 years ago
Read 2 more answers
SAVINGS ACCOUNT Demetrius deposits $120 into his account. One week later, he withdraws $36. Write an addition expression to repr
LenKa [72]

Answer:

+$120 - $36

Higher by $84

Step-by-step explanation:

Addition expression is an equation without the equals to sign

$120 - $36

When the first expression was made, the account was higher by $120

After the second transaction, the account would be higher by $120 - $36 = $84

6 0
4 years ago
1) (3+2i)-(1-6i) <br> 2) 4i+3-6+i-1<br> 3) 5i(3-2i)<br> 4) (5+3i)(2-3i) <br> 5) (2+i)(2-i)
lutik1710 [3]

Answer:


Step-by-step explanation:

1) (3 + 2i) - (1 - 6i)

  3 + 2i - 1 + 6i

  2 + 8i

2) 4i + 3 - 6 + i - 1

   5i - 3 - 1

   5i - 4

3) 5i ( 3 - 2i )

   15i - 10i^2

   15i - 10 ( -1 )

   15i + 10

4) ( 5 + 3i ) ( 2 - 3i )

   10 - 15i + 6i - 9i^2

   10 - 9i - 9i^2

   10 - 9i - 9 ( -1 )

   10 - 9i + 9

  - 9i + 19

5) ( 2 + i ) ( 2 - i )

    4  - 2i + 2i - i^2

    4 - i^2

    4 - (-1)

    5

I hope this helps!

8 0
4 years ago
Read 2 more answers
Determine which postulate or theorem can be used to prove that
EleoNora [17]

Answer:

\triangle ABC \cong \triangle DCB by <u>AAS</u>

Step-by-step explanation:

According to the following two triangles, \triangle ABC and \triangle DCB are congruent by <u>Angle-Angle-Side</u> (AAS), because there are two angles shown and share a side, which is in the middle between triangles.

7 0
4 years ago
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