B is the correct answer
C and D would be incorrect as 7 and 15 multiplies to 105 not 115
A is incorrect as -5 and -15 make a positive 75 not a negative 75
Answer:
8.2 minutes
Step-by-step explanation:

492 seconds = 8.2 minutes
Ans: Zero of the function is: x = 0
Explanation:
Given function:
f(x) = (4x^2 - 36x)/(x-9)
Simplify it!
f(x) = (4x(x -9))/(x-9)
f(x) = 4x
Now Put the function equals to zero.
4x = 0
x =0 (zero of the function)