Which point lies on the graph of the equation 3x+y=9

A. (-1,9) b. (9,0) c. (1,1) d. (0,9)

Lines a and b are perpendicular. if the slope of line a is 3, what is the slope of line b?

Which angle of rotation is an angle of rotational symmetry for all figures?

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?