Answer:
C - 7315
Step-by-step explanation:
Using the combination formula.
22! / (4!(22-4)!) = 7315
Combination is like saying I want meat-cheese-lettuce-tomato and this is the same as cheese-meat-tomato-lettuce. (same toppings, different order)
Using linear functions, we have that:
A.
For Company A: 
For Company B: 
B. The salaries will be the same after 7 years.
A linear function is given by:

In which:
- m is the slope, which is the rate of change.
- b is the y-intercept, which is the initial value.
Item a:
- For Company A, the salary starts at $31,000, with a raise of $3,000 each year. Thus,
, and the salary after n years is given by:

- For Company B, the salary starts at $38,000, with a raise of $2,000 each year. Thus,
, and the salary after n years is given by:

Item b:
- They will be the same after n years, for which:

Then




The salaries will be the same after 7 years.
A similar problem is given at brainly.com/question/24282972
0.25•4=1
5.5/.25=22
Clara would have to run 22 laps
The square root of 144=12
169=13
the difference is 13-12=1