I don't understand this question. this is quadratic function

Correct  x = 50 seconds

Step-by-step explanation:

The given function g(x) = (1/20) · x · (x - 100) is actually quadratic function:

g(x) = (1/20) · x² - 5 · x    or parabola

The standard form of a quadratic function is:

y = ax² + bx + c

For which x is the minimum of the parabola we can find with this formula:

x = - b / 2 a

in this case a = 1/20 and b = - 5

x = -(-5) / 2 ·(1 / 20) = 5 / (1 / 10) = 5 · 10 = 50 seconds

x = 50 seconds

God with you!!!

step-by-step explanation: