The muzzle velocity of an ancient cannon was about 420ft/s. what is the cannonball's speed in miles per hour?

Me n o w. i need t h i s. 10 points

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?

Iknow the square root of 2 is irrational