Two marbles are chosen, without replacement, from a jar containing only red and green marbles. the probability of selecting a green marble on the first draw is 0.8. what is the probability of selecting a red marble on the second draw, given the first marble drawn was green?

Ineed to know how to write question one in mathematical terms

You have 37 coins that are nickels, dimes, and pennies. the total value of the coins is $1.55. there are twice as many pennies as dimes. find the number of each type of coin in the bank.

This size running track is usually called a 400 meter track. however if a person ran as close to the inside as possible on the track they would run less than 400 meters in one lap. how far away from the inside border would someone have to run to make one lap equal exactly 400 meters