Let a, b∈g, where g is a group. then which one of the following statement is not true.
a)if a, b,ab have same order then ab=ba
b)if a^3=e, the identity element of g and aba^-1=b^2 then order of b=16
c)ab and ba have same order
d)b and aba^-1 have same order

The function c(x) = 400x – 0.2x2 represents the total costs for a company to produce a product, where c is the total cost in dollars and x is the number of units sold. which statement is true? one thousand units have the minimum cost of $200,000. one thousand units have the maximum cost of $200,000. two thousand units have the minimum cost of $800,000. two thousand units have the maximum cost of $800,000.