I'm having lots of trouble with probability. Well basically dice. I don't understand dice. I have a test tomorrow and I need an A or I will get a B+ in the class, which I don't want. Please help. 
6.
Two number cubes are rolled. What are the odds that the sum of the numbers showing is less than 9?
8.
Two number cubes are rolled twice. What is the probability of rolling a sum of at least 6 then rolling doubles?
9.
There are 5 pennies, 7 nickels, and 9 dimes in a change purse. Suppose 2 coins are selected at random. Find the probability of selecting 2 pennies if the first coin is replaced before the second coin is chosen.
Thanks a bunch!
6.
Two number cubes are rolled. What are the odds that the sum of the numbers showing is less than 9?
8.
Two number cubes are rolled twice. What is the probability of rolling a sum of at least 6 then rolling doubles?
9.
There are 5 pennies, 7 nickels, and 9 dimes in a change purse. Suppose 2 coins are selected at random. Find the probability of selecting 2 pennies if the first coin is replaced before the second coin is chosen.
Thanks a bunch!