Answer:
45 hours on math, 20 on science, 18 on soc st, and 17 on la
Step-by-step explanation:
percents are how many out of one hundred
Answer:

Step-by-step explanation:
Given


Required
Determine the difference between the points
The difference is calculated as follows:



The answer is the first option: 1)
> the quantity
times
minus
all over 
The explanation is shown below:
1. To solve this problem you must pply the following proccedure:
2. Move the term
to the left member. As the variable is negative, multiply the expression by
and change the direction of the sign:

The average cost in 1990 is <span>$12,841.</span>