By cutting away an x-by-x square from each corner of a rectangular piece of cardboard and folding up the resulting flaps, a box with no top can be constructed. If the cardboard is 12 inches long by 12 inches wide, find the value of x that will yield the maximum volume of the resulting box. 4 0 3 12/5 0 6 10 2 D Question 11 1 pts Find the interest rate r needed for an investment of $3,000 to grow to $9,000 in 5 years if interest is compounded continuously. Or= In3 In 5 Or= In3 Or = 5In(1/3) Or = 5In 3