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Vlad [161]
3 years ago
8

HELP ME PLS RN AAHHHHHHH

Mathematics
1 answer:
____ [38]3 years ago
6 0

Answer:

C. 9

Step-by-step explanation:

3n - 18 = 9

3n (- 18 + 18) = 9 + 18

3n = 27

3n/3 = 27/3

n = 9

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X+3y-2z=10, -x-2y+z=-7, 3x+9y-5z=28
NISA [10]
Hmm
what you do is try to eliminate 1 variable in 2 equaions first
we can elminate x's in first and 2nd equation

add first and 2nd equation
x+3y-2z=10
<u>-x-2y+z=-7 +</u>
0x+y-z=3
y-z=3


multiply 2nd equation by 3 and add to last one
-3x-6y+3z=-21
<u>3x+9y-5z=28 +</u>
0x+3y-2z=7

3y-2z=7

we now have
y-z=3
3y-2z=7
multiply first equation by -2 and add to 2nd

-2y+2z=-6
<u>3y-2z=7 +</u>
y+0z=1
y=1

now we can sub back
y-z=3
1-z=3
minus 1
-z=2
times -1
z=-2

sub baack into any equation
x+3(1)-2(-2)=10
x+3+4=10
x+7=10
minus 7
x=3

x=3
y=1
z=-2
(3,1,-2)

6 0
4 years ago
Read 2 more answers
Rudolfo wants to save his allowance in his own bank account. Given that his principal amount ₱20 000 with 1.5% monthly interest
xeze [42]

Answer:

Step-by-step explanation:

P = 20,000

R= 1.5

T= 2 years

A = P(1+ R/100) ^ n

4 0
3 years ago
Which expression has a term with a coefficient greater than 1?
Svetradugi [14.3K]

Answer:

3 + 2x : his has a coefficient of 2

Step-by-step explanation:

hop this helps

plz mar brainliest

3 0
2 years ago
What is the reciprocal of 7/11 in simpliest form
Leona [35]

Answer:

11/7is your <em>answer</em><em> </em><em>.</em><em>.</em><em>.</em><em>.</em>

Step-by-step explanation:

hope its help you

8 0
3 years ago
Study the stem-and-leaf plot. How many cars get 8 miles per gallon?
RUDIKE [14]

Answer:

answer is O

Step-by-step explanation:

7 0
3 years ago
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