Suppose that w and t vary inversely and that t =1/5 when w = 4. write a function that models the inverse variation, and find t when w = 9.
would it be t=1/5w; 4/45 or 4/5w; 4/45?

Aline passes through 3,7 and 6,9 what equation represents the line

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.