Convert this fraction percentage into a decimal

Explain how you can use the associative property to evaluate (7x50)x4.

What is coefficient of the term of degree of degree 5 in the polynomial below

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.