120 kg in the ratio 3:2

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

What is the value of x? assume that the line is tangent to the circle.

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?