Mark has 2567803 marbles. Sarah has 56745643 more. Alex has 372263027 less than sarah. how many marbles do all of them have all together?

What is the standard form of -5x^2+2x^4-11+x^3+3x

If g(x) is an odd function, which function must be an even function?

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.