A student buys a laptop for 250 US dollars and at the end of the year sells it for 20% less than was paid for it. It is sold for?

Fracisco's game involves 3 green, 2 yellow, 4 red, and 3 black marbles. if he randomly draws three marbles from the bag, without replacement, what is the probability that he will draw yellow, and then red, and then black? a)1/192 b)1/72 c)3/220 d)1/55

The diameter of the moon is about 3500 km. approximate the surface area of the moon using the formula for the surface area of a sphere, s = 4πr2. write your answer in scientific notation.

If twice a number is at least three less than four times the number, which of the following are true? let n represent the number.