Each term of expression 6x⁴ - 9x³ - 36x² + 54x can be divided by 3x. Therefore the expression can be simplified to: 3x(2x³ - 3x² - 12x + 18) Expression 2x³ - 3x² - 12x + 18 can be represented as (x - 2.45)(x + 2.45)(x - 1.5)
Finally, expression 6x⁴ - 9x³ - 36x² + 54x is factored as 3x(x - 2.45)(x + 2.45)(x - 1.5)
Well if she earned the same amount per hour the hours can be added. 2.25 + 3.25 = 5.5 hours. To get the rate of earning per hour you would then divide the total made by the total time worked. 42/5.5 = $7.64 approximately.
