S(n)=^2
S(13), n=13
S(13)= (13)^2
(13)^2=169
To solve this problem you must apply the proccedure shown below:
1- The problem says that you are swimming each 25 yard length 3 seconds faster than your personal best and you have to calculate the change in time (which you can call
) of your personal best after 200 yards.
2- To calculate this, you must multiply 200 yards by 3 seconds and divide by 25 yards, as following:

Therefore, the answer is: 24 seconds.
Hmm... I would say the equation would look like 3+5x=72/4.
3+5x=72/4
3+5x=18
5x=18-3
5x=15
x=15/5
x=3
The number is 3
Answer:
The question is not fully visible but what u want to do is group them subtract/add what u can and then factor it out
Step-by-step explanation: