What does stand for in this equation? 6 x 3 = (x 5) - (x2)

2men and 7 boys can do a piece of working 4 days.it is done by 4 men and 4 boys in 3 days how long would it take for 1man or one boy to do it alone

Which of the functions graphed below has a removable discontinuity?

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2