Apair of dice is rolled 20 times. what is the probability that a sum of 5 is rolled at least r times

If a =6, what is the value of 2a(3b + 5c)?

My math teacher told my class to "steal" a 6th grade fraction word problem from the internet, word problems? : -p requirements: only a 1 step word problem. needs to be complex.

The price of a dozen eggs was $1.63. suppose the price increases m dollars per dozen and then the price decreases $0.12 per dozen. which expression represents the current price of eggs after the two price changes?