A relation is a function if it passes the vertical line test. That graph in a coordinate plane is just a sin wave that is spread out. If you run a perfectly vertical line through the graph at every place on the graph, the line you draw will only go through the graph at one place every time. That makes it a function. It's not a one-to-one function cuz it fails the horizontal line test, but it is a function!
Answer:
99.93 
Step-by-step explanation:
1. The area of a circle is defined by the equation: A = 
2. We can plug in the radius and solve the equation: A = 
3. A = π * 31.8096
4. A = 99.932
5. A = 99.93
Answer:
rotation of 270°
Step-by-step explanation:
Consider the coordinates of of preimage and image of ABC
A(1, 0 ) → A'*0, - 1 )
B(6, - 7 ) → B'(- 7, - 6 )
C(0, - 4 ) C'(- 4, 0 )
What we note is the x- coordinate of the image is the y- coordinate of the preimage and the y- coordinate of the image is the negative of the x- coordinate of the preimage, that is
(x, y ) → (y, - x )
This is equivalent to a counterclockwise rotation about the origin of 270°
C) It doesn’t satisfy either the top or bottom equations.
When we plug them into the top equation:

Simplify:

Because the statement of -23 = -15 is wrong, the solution pair is wrong for the top equation.
When we plug them into the bottom equation:

Simplify:

9 = -8 is not a valid statement, so the pair doesn't satisfy both of the equations.