Use the x-intercept method to find all real solutions of the equation.
x^3-8x^2+9x+18=0

a.

Step-by-step explanation:

The given equation is;

To solve by the x-intercept method we need to graph the corresponding function using a graphing calculator or software.

The corresponding function is

The solution to is where the graph touches the x-axis.

We can see from the graph  that; the x-intercepts are;

(-1,0),(3,0) and (6,0).

Therefore the real solutions are:

i assume that by 5 you mean 5 gallons.

(20)(0.25) = 15

removing 15 gallons reduces the tank from 20 to 5.

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step-by-step explanation: