A function is a relation in which every input has one output.
Relation 1 is a set of points where each x value has a single y value. function
Relation 2 is an equation of a line. With the exception of vertical lines, all lines are functions. This example is not a vertical line. function
Relation 3 is a graph of an absolute value equation (y=|x|-1). We can use the vertical line test and see that it is a function.
Relation 4 has input two traveling to two outputs (A and B). So it is not a function.
Answer: 4
Pi x (radius)^2 = Area of circle
Hope that helps!
Answer:
9. 168
10.

Step-by-step explanation:
on the picture
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Answer:
(0, 0); (1, 3); (2, 4)
Step-by-step explanation:
The above-listed points are not on a line with constant slope, so do not represent direct variation.
Probability of first number being even : 5 even numbers...10 equal sections...probability is 5/10 or 1/2
probability of 2nd number being odd : 5 odd numbers...10 equal sections...so probability of both is 5/10 or 1/2
probability of both occurring : 1/2 * 1/2 = 1/4 <== (or 25% if u need it in percent form or 0.25 if u need it in decimal form)