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Ivahew [28]
3 years ago
10

Last one, Help with math please 18-20 on the pdf. I do not know how to post a picture I am so sorry.

Mathematics
2 answers:
tatuchka [14]3 years ago
8 0
Question 18
The answer is 4 days. 
Because, 
Kevin =3×n
Anita =4+ (2×n)
Equating the two equations. 
3n=4+2n
3n-2n=4
n=4

Question 19
When the solution is (4,1), it means the value of y=1 and x=4. 
The answer is;
y=x-3
y=-3x+13. Since when the values of x and y are substituted they satisfy the system. 

Question 20
The system has no solution.
This is because the line are parallel and they do not intersect to give a solution. 



soldier1979 [14.2K]3 years ago
6 0
Hello,
Please, see the attached files.
Thanks.

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The square of a positive number increased by twice the number equals three. Find the number
koban [17]

Answer:

1

Step-by-step explanation:

Let the number be x

x² + 2x = 3

x² + 2x - 3 = 0

Product  = -3

Sum =2

Factors = 3 * (-1)

x² + 3x - x - 3 = 0

x*(x+3) - (x + 3) = 0

(x + 3)(x - 1) = 0

Ignore x + 3 because the number is a positive number

x - 1 = 0

x = 1

The number is 1

8 0
2 years ago
The ratio two numbers is 3 and 5 their sum is 135find two number
n200080 [17]

Let, the numbers = x,y

x/y = 3/5

total ratio units = 3+5 = 8

value of 1 unit = 135/8 = 16.875

So, numbers would be 3(16.875) & 5(16.875) = 50.625 & 84.375

so, your answer is 50.625 & 84.375

5 0
3 years ago
Answer quickly please <3
sertanlavr [38]

Answer:

x is greater than -5

Step-by-step explanation:

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3 years ago
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6 0
3 years ago
Do 4x and 15 + x have the same value when x is 5? How do you know?
alexandr402 [8]

Answer:

yes

Step-by-step explanation:

If x = 5,

4x=4*5=20

15+x=15+5=20

They're both the same.

4 0
2 years ago
Read 2 more answers
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