19^2 + x^2 = 21^2
19^2 = 361
21^2= 441
361 + x^2 = 441
x^2 = 441-361 = 80
x = sqrt(80) = 8.944 round to nearest tenth = 8.9
Answer:

Step-by-step explanation:

To find g(-4) , substitute the value of x that's - 4 into g(x). That is for every x in g(x) , replace it with - 4
We have

We have the final answer as
<h3>g(-4) = 14</h3>
Hope this helps you
Answer:
A) the value of the car will be 13,333.34 after 3 years ( not sure )
B) the depreciation of the car will be 2222.22 per year ( not sure)
C) i do not know
Answer: 
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Work Shown:

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Explanation:
The idea is to first get all the y terms to one side. I did this by subtracting 2y from both sides in the third step.
Then factor out y and divide both sides by (8x-2)
Afterward there's the optional steps of simplifying (as shown in the final two steps).
Answer: x=6.4
Step-by-step explanation:
14 + (-7.96) = 6.40