Step-by-step explanation:
In set a, every element in the domain has only 1 image in the range. This is called a one-to-one correspondence.
However in set b, there is a many-to-one correspondence as more than 1 element in the domain has the same image.
Answer:
half of a number is 15
Step-by-step explanation:
An equation must contain an equality sign.
The third option is the only phrase that can be represented as an equation: 
Answer:
2
Step-by-step explanation:

Hope this helps!
Answer:
60
Step-by-step explanation:
Answer:
Step-by-step explanation:
5x + 2y = - 2
2y = - 5x - 2
y =
x - 1