Please answer, thank you

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

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?