Algebra 2 - Grade 11 Can anyone please help me with these questions

Use synthetic substitution to find f(–3) and f(4) for each function.

f(x) = x^2 + 2x + 3

f(x) = 2x^4 – 3x^3 + 4x^2 – 2x + 1

Abag contains 3 red marbles 4 white marbles and 5 blue marbles if one marble is drawn from the bag what is the probability that the marble will be blue

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?

I'm confused on this could anyone me and show me what i need to do to solve it.