Suppose that a company's profit function over time is
p(x)=? 0.4x^3+5x^2+10 thousand dollars, where x is the number of years since the end of 2010. so, for example, x=2 corresponds to the end of 2012, and x=2.1 corresponds to the beginning of 2013.)
the point of diminishing returns is x= 4.17 (give your answer as a fraction or as a decimal with at least 3 decimal places.)
this corresponds to the year ?
i could find the point of diminishing returs, but i can not find this corresponds to the year.
how can i solve?

your answer would be 10x - 1

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".

im not sure

step-by-step explanation:

tube or goog would be a great resource to with that question