Let x be the amount he invests at 6%
1280 = 0.06x + 0.07(20000 - x)
1280 = 0.06x + 1400 - 0.07x
1280 - 1400 = -0.01x
-120 / -0.01 = x
x = 12000
Therefore, he invests $12,000 at 6% and $8,000 at 7%

So, Graph of Image 1 is correct.
Step-by-step explanation:
We need to find the graph of the solution o the equation 
Solving:

Adding -3 on both sides


Applying absolute rule: if |u|>a then u>a or u<-a

So, all values greater than 2 and less than -2 are included.
So, Graph of Image 1 is correct.
Keywords: Solving inequalities
Learn more about Solving inequalities at:
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Hello there,
If she has 10 books and she can arrange it 3 ways on her bookshelf, you just multiply 10 and 3
10 x 3= 30
Susan can arrange 10 books into 3 slots 30 ways.
Hope this helps!
Answer: x = 0
Step-by-step explanation: Multiply to remove the fraction, then set equal to 0 and solve.
Answer:
Step-by-step explanation: