Answer: (v - 9)^2 - 81
Step-by-step explanation: Use the formula (b/2)^2 in order to create a new term to complete the square.
Hope this helps! :) ~Zane
From breaking up the problems and sorting them out
1.4 hours cause 560/400 =1.4
90°
all angles of a triangle add up to 180°, so 45+45=90°, 180-90=90°, 90+90=180°