Answer:
81
Step-by-step explanation:
Given the expression: 
To make it a perfect square, we follow the following steps.
Divide the coefficient of x by 2
- Coefficient of x=18, 18/2=9
Square It
Add it to the expression
This is written as a perfect square as: 
The constant term required therefore is 81.
Answer:
So, the relation between variables are

Step-by-step explanation:
We are given

Since, we have to find relation between variables
so, we can solve for y

Firstly, we will multiply both sides by y

we can simplify it

we can isolate y
so, we can divide both sides by 7
so, we get

Answer:
Look at the pic
Step-by-step explanation:
I hope I did it right...I haven't touched this topic a long time
Im not quite sure but i think the unit rate is 150. Hope this helps!!
Answer:
For every 15 students scoring in the 60's there were 9 students scoring in the 70's.
Step-by-step explanation:
Your first step would be to rewrite the numbers into an easier to understand form like fractions, 45/3 and 27/3. Then you divide both numbers by 3, so you get comparable numbers. 45/3= 15, 27/3=9.