Put in the form of a+ib 5.(cos 7π/6+sin7π/6)

Guests at an amusement park must be at least 54 inches tall to be able to ride the roller coaster. which graph represents the set of heights that satisfy this requirement?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

When you have 25 numbers, and jake picks 3 random numbers and puts them back, what is the chance bob has of picking those 3 numbers when he picks 6 random numbers (without putting them back)? explain.