(2x*3x)+2x*4-3(3x)-3(4)
6x^2+8x-9x-12
6x^2-x-12
You simply put 40 over a hundred and 55 over n (which is the number were trying to find) so you do cross multiplication. 55 times a hundred and after you get the answer. You divide it by 40 and should get 137.5.
Answer: (2815/2) + 20 = 1427.5
Step-by-step explanation: