Help (the answer isn't the 3rd one my friend did this test and chose that and got it wrong please )

What is the base of 1/9 to the power of 2

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

How can (square root of 25) ^2 be rewritten?