solve a b and c pls

Assignment 3F Question 3 [ /35 points] Reserve Cegep a d The PCGCC prides itself on its "nouveau" architecture, In particular, one of the reception halls is a glass pyramid. The pyramid looks like two tetrahedrons pasted together: it has four sides and a square base. It was constructed according to the following equations. 1 21" 21 10 = =1, with x, y, and = 20 1 -y+- z =1, with - x, y, and = 20 21 21 10 1 1 21 21" 10 -z = 1, with x, - y, and = 20 1 21 21 10 z = 1, with - x, - y, and = 20 a) Draw the reception hall on a 3-dimensional Cartesian coordinate system. b) Determine the height of the reception hall. c) You need to hire a company to wash the glass of the reception hall. You get two quotes: the first company will wash the windows for $1,000; the second company will wash the windows for $0.95 per square metre. Which company should you use, if the quality of both companies is equivalent? E 201-105-RE Linear Algebra and Ve