Please help! math
posted by kelli .
I don't understand these types of problems
Find the average rate of change of f between 1 and x
f(x)f(1)/x1
and X cannot be equal to 1
1) f(x)= the square root of x+3
2) f(x)=1/(x^2)
3) f(x)=x^3 + x

Please help! math 
drwls
Here's how you do #1. The others can be done the same way.
I will assume than f(x) = sqrt(x+3) and not (sqrt x) + 3. You should have used parentheses to clarify the problem.
Find the average rate of change of f between 1 and x . That is
[f(x)f(1)]/(x1)
= [sqrt(x+3)  sqrt4]/(x1)
= [sqrt(x+3)  2]/x1)
is the average rate of change in this case, from 1 to x.
For x = 2, this is 0.236..
For x = 3, it is 0.224..
For x = 4, it is 0.215..
For x = 13, it is (42)/12 = 0.1667... 
Please help! math 
mirela
Need help I have 91.36 need to round it up to 5 whats my answer
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