The mean of 5 and 15 is 10. (5+15= 20 20/2=10)
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Answer:
Step-by-step explanation:
Given is a function f(x)

We have to analyse and sketch the graph
X intercept : Put y =0, we get x=0
Y intercept: Put x =0 , we get y =0
No exception for x or y and hence set of all real numbers is domain and range.

f' becomes 0 not at finite points
So relative extreme
Graph is sketched and attached
The answer is 240 to put in c hope this helps