Answer:

Step-by-step explanation:
Hello,
let s assume that m+n is different from 0
we have this equation and we need to find m as a function of t, s, and n

<=>

for t-s different from 0, so t different from s
hope this helps
Answer:
attached above with detail explanation.
Answer:
29
Step-by-step explanation:
20^2+21^2=841
Answer: B
Step-by-step explanation:
In this big ol' word problem, this is just an instance of basic multiplication/division.
If it takes it 1 hour for 3 meters...
12 ÷ 3 = 4.
It would take 4 hours for the water level to change to 12 meters.