If you were babysitting, would you rather
• charge $5 for the first hour and $8 for each additional hour?
or
• charge $15 for the first hour and $6 for each additional hour?
explain your reasoning.

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)

What is the length of the segment, endpoints of which are intersections of parabolas y=x2? 11 4 x? 7 4 and y=? 7 8 x2+x+ 31 8 ?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?