Show that the equation x^4/2021 - 2021x^2 - x - 3 =0 has at least two real roots

Given f(x) = 17-x^2what is the average rate of change in f(x) over the interval [1, 5]?

Gretchen is setting up for a banquet. she has 300 chairs and needs to distribute them evenly among t tables. how many chairs should she put at each table? write your answer as an expression.

Stephen thublin invests $1,000,000 in a 45-day certificate of deposit with 6.55% interest. what is the total interest income from the investment?