What is the maximum of relative extrema 3x^4-x^2+4x-2

Factor this polynomial completely x^2-64

As a salesperson you get $50/day and $3.60/each sales you make. if you want to make $60 in one day, how many sales would you need need to make ? a 3b 4c 5d 6 show work.

Based on the diagrams, what is the value of x?