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Kitty [74]
3 years ago
15

If a certain number is multiplied by five, the result is the same as twenty-one plus twice the original number. What is the valu

e of the original number?
Mathematics
2 answers:
expeople1 [14]3 years ago
6 0
7
7 times 5 = 35
21 + 14 (7*2) = 35
Zepler [3.9K]3 years ago
4 0
Let the number be x

a.t.g.c
            5x = 21+ 2x
            5x-2x = 21
            3x    =   21
             
             x    =   21/3
    
             x    =   7      give me brainliest
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I need help with this​
VLD [36.1K]

Answer:

im sorry wish i could

Step-by-step explanation:

4 0
2 years ago
Solve by the linear combination method (with or without multiplication) <br> 2x+3y= -17, 5x+2y = -4
Amiraneli [1.4K]
2x+3y= -17 
5x+2y= -4
You must cancel either the x or y out to solve so i'm going to cancel the x. 
-5(2x+3y= -17)
2(5x+2y= -4)
This simplifies to: 
-15x -15y=85
15x+4y= -8
The -15x and 15x cancel out leaving you: 
-15y=85 
4y= -8
You add them top numbers by the bottom and get: 
-11y=77
Then divide by -11 to get y by its self.
y= -7
Now that you know what y is just plug it in to either original problem. I will use the second one. 
5x + 2(-7) = -4
5x -14 = -4
5x = 10 
x = 2
So the answer is (2,-7) or x=2 and y=-7
6 0
3 years ago
Read 2 more answers
Qustion to give kagimatoby a brainly
Colt1911 [192]

Answer:

wdym

Step-by-step explanation:

7 0
3 years ago
Pls... it’s my last question worth branliest
katrin [286]

Answer:

6/20, No

4/26, No

2/6, Yes(divide by 4)

1/3, Yes(divide by 8)

Step-by-step explanation:

:)

3 0
3 years ago
By using the chebyshev inequality, find a lower bound for the probability that the average of her measurements will differ from
Daniel [21]
To find the Chebyshev's inequality, P | Xn - E(X)| <= δ/4 >= 1 - (δ^2/25)/(δ^2/16) = 1 - (16/25) = 9/25 = 0.36
The answer in this question which is the probability that the average of the physicist's measurement is within δ/4 units of the actual specific gravity is at least 0.36%
4 0
3 years ago
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