The expression 2.4x−3.9y−1.2x+ay is equivalent to 1.2x+1.2y. What is the value of a?

Enter your answer as a decimal, like this: 42.5

What is the probability of throwing several dice with sum equal to 6 (six)? show the ways of possibilities for sum 6 (as the numerator) and the ways of throwing n dices for n = 1, 2, 3, 4 or 5 as denominator for all the questions to earn full credits. (a)throw one die, (b) throw two dice, (c) throw three dice (d) throw 4 dice, (e) throw 5 dice