Please help me with this!

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

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

Which number line correctly shows 0.8 + 0.3?