Convert 101101 base 2 to base 10

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

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?

What is the slope of (0,32) and (100,212)