book Maths Puzzle Numerical Ability

AN octagon has eight sides of varying lengths. What is the sum of the measures of its interior angles?

Read Solution (Total 0)

book Other Question

You tell Congress that the space ship they ask for would have a raius that's ?? times bigger than what you suggested and the voume (and weight and cost) would be ?? as large. After I need to find out (for economics) how to graph the following:
Px = (400/3) + (1/3)Qs
This is for supply and demand. Isn't it true that to graph you set p=0 then solve for q? And