Answer : 25x^4 - 10x^2 - 3
substitute 5x^2 for x in the equation x^2-2x-2
(5x^2)^2 - 2(5x^2) - 3
simplify
25x^4 - 10x^2 -3
The one that is wrong is 15 times 10 to the 20th power because the number 15 is suppose to be changed/ decimal needs to be moved so it becomes a number between 1 and 5 which is 1.5
Your unit cost will be $0.11 :)
X=m/5-p/5 i tried my best to answer this problem