Answer:
B
Step-by-step explanation
a function has to be on a graph and pass the horizontal line test. if it does not pass it then it will not be a function
Answer:

Step-by-step explanation:
Complete question

Required
Solve for x
We have:

Collect like terms

Multiply through by 

Make x the subject

Answer:
6,7
Step-by-step explanation:
Answer:
89
Step-by-step explanation:
7^2=49
49+4=53
6^2=36
53+36=89