Answer:
It is a function
Step-by-step explanation:
Answer: there is a relationship between study hours and test score. as the hours of studying increase, the test scores increase.
B: The associate property of addition.
1. Note that the number 1.8 consists of two parts 1 and 0.8.
2. The decimal 0.8 can be written as the fraction 
3. Add these two numbers:

4. Since 18=2·3·3 and 10=2·5, the fraction
can be simplified to the rational number

At the end of the year ...
the price will be 44,000*1.0324 = 45,425.60
the bank balance will be 44,000*1.02 = 44,880.00
This is 545.60 fewer dollars than required to pay the price.
You lose $545.60 in current-year buying power.