X-3y=6 converting standards

Enter the number of complex zeros for the polynomial function in the box. f(x) = x+ + 5x² +6

I’m really confused and need your assist me with this question i’ve never been taught

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?