Please help me...

There are 18 astronauts, and they do not want to launch a space shuttle that is not full. If they want to send as many astronauts as possible, how many shuttles will launch, and how many will remain on earth?

Number of space shuttles that are launched: ?

Astronauts still on earth: ?

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?

Determine the domain and range of the given function. the domain is all real numbers all real numbers greater than or equal to –2{x: x = –2, –1, 0, 1, 2}{y: y = –2, –1, 0, 1, 2}. the range is all real numbers all real numbers greater than or equal to –2{x: x = –2, –1, 0, 1, 2}{y: y = –2, –1, 0, 1, 2}.

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top