Can function notations be simplified? I was working on this equation: f(x) = -6/9x + 300
I was wondering if I can convert the fraction ‘-6/9’ into ‘-2/3’?

Which is the directrix of a parabola with equation x2=8y y = 2 x= -2 y=-2 x= 2

Crystal and victor are comparing the estimated calories burned in a calorie-counting software to the actual calories burned during exercise. use the drop-down menus to complete the statements about the software's accuracy.

The number of fish swimming upstream to spawn is approximated by the function given below, where x represents the temperature of the water in degrees celsius. find the water temperature that produces the maximum number of fish swimming upstream. f(x)= -x^3 + 3x^2 + 189x + 5143, 4 ≤ x ≤ 18 the maximum number of fish swimming upstream will occur when the water is degres celslus (round to the nearest degree as needed.)