Answer:
A and C
Step-by-step explanation:
B has a solution and D is 0. A and C are the only ones with no solution.
Answer:
D
Step-by-step explanation:
An operation of two real numbers is defined by the rule
Calculate 
First evaluate the expression in brackets:
Now,
Answer:
4, x-1
Step-by-step explanation:
The first piece of this function goes from -1 to 1. Since that part of the function is a horizontal line at y=4, and has no slope, this first part is just 4.
The second piece of this function goes from 3 to 5. This piece does have a slope that you can either solve or just from reading the graph will give you a slope of 1. Since one of the points is (3, 2), we can figure out that the y-intercept is -1. (You can also just extend the line across the y-axis). When putting this equation together we get x-1 being the second part.
First row: Not independent because without replacement
Second row: Independent (same coin)
Third row: Not independent (without replacement)
Fourth row: Independent (with replacement)
