Answer:
n = 5
Step-by-step explanation:
Given
5n + 20n = 5(n + 20), that is
25n = 5(n + 20) ← divide both sides by 5
5n = n + 20 ( subtract n from both sides )
4n = 20 ( divide both sides by 4 )
n = 5
Answer:
2x + 8
Step-by-step explanation:
Don't worry, this is simple! Add up the common terms.
For example, you can't add up 2x and 5, because 2 is being multiplied by a variable.
So combine the x terms: 2x
And the numerical terms: 8
Combine 2x and positive 8.
2x + 8
Answer:
17
Step-by-step explanation:
45 - 28
Hope this helps!!!!!!!
The interval notation given to us means that x is between negative infinity and 5, excluding both endpoints.
So we can write 
which shortens to 
The graph will have an open hole at 5 on the number line, and shading to the left to indicate all points smaller than 5.
5x-9y=-65
10x-3y=20
Multiple the first equation by 2
10x-18y=-130
10x -3y=20
Then subtract the two equations to get rid of the x
21y=-150
Divide the -150 by 21
Y=-7.14
Plug the y into the original equation. (Either one)
5x-9(-7.14)=-65
5x-64.28=-65
Then add 64.28 to the -65
5x=-0.72
Divide by 5
X=-0.144
I hope this is right
