Question 7 The following problem's solution has a mistake. a. On what row does the mistake occur? Justify your answer. b. What is the correct standard form? Select the "Insert" drop-down option in the menu below and use "vx Equation" to type your answer when you need to incorporate symbols, equations, or other math expressions. Problem: Convert the following equation to standard form: 9x2 - 412 - 36x + 8y - 4 =0 Solution: Row 1: 9x2 - 36x - 4y + 8y = 4 Row 2: 9 (x2 - 4x) - 4 (12 - 2y) = 4 Row 3:9 (x2 - 4x + 4) - 4 (12 - 2y + 1 ) =4 Row 4: 9(x - 2)2 - 4() - 1)= = 4 Row 5: 9(x-2)2 4()-1) 4 Row 6: . (x-2)' ()-1)- : 1 Edit View Insert Format Tools Table 12pt * Paragraph " B I U A BY Ty : a. bA replace arch is to be constructed in the form of a semiellipse. The opening is to have a height of 2 feet at the center and a width of (5 feet along the base. The contractor cuts a string of a certain length and nails each end of the string at the foci of the base in order to sketch the outline of the semiellipse. a.} What is the total length of the string? [Salad] V b.} How far from the center should the string be nailecl into the base? [ Select ] V A satellite dish is the shape of a parabeloid. The dish is 33 inches wide. and 10 inches deep. How manic.r inches should the receiver be located from the vertex for optimal reception? [round to the nearest thousandth}