The equation that is shown on the graph is y = x - 3, because the value of y is x - 3. :)
Given:
Radius of small circle = 4 in.
Width of gray border = 2 in.
To find:
The area of the gray border.
Solution:
We have, radius of small circle:

The width of gray border is 2 in. So,t he radius of the larger circle is:


Now, area of gray border is the difference for area of larger circle and smaller circle.


Substituting
in the above formula, we get




The area of the gray border is
square inches. Therefore, the correct option is D.
Answer:
D) x = 40.5
Step-by-step explanation:
When parallel lines create a smaller triangle inside a larger triangle, the triangles are similar. Triangle similarity means that side lengths are proportional, meaning to find x we must use dimensions of the smaller triangle to create a proportion.
The left side of the larger triangle is 12 + 15, so it is 27.
The left side of the smaller triangle is 12.
So, part of the proportion will be 
The bottom side of the larger triangle is x.
The bottom side of the smaller triangle is 18.
So, part of the proportion will be 
The full proportion will be:

Cross multiply and solve for x.
27(18) = 12x
486 = 12x
40.5 = x
Since we know he earns $75 a week we can write
$75x
And we know he already has $520, so just add that.
+$520
So we would set up our algebraic expression like this.
$75x + $520
Good Luck! :)