3. An open box is formed by cutting a square piece out of each corner of a 10-by-8 inch metal plate, as shown in the picture below. We denote the length of the side of these square pieces, measured in inches, by x. X 10 8 a. Determine the equation of the function which expresses how the volume V of this box depends on x. b. Find the domain of the function V(x).

Q: 80 Height (metres) 40 Y 5 10 15 Time (minutes) 20 25 30

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