Help on my recent question plz?

To determine the number of deer in a forest a forest ranger tags 280 and releases them back

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 20 = x a. 5, 4 b. -5, -4 c. -5, 4 d. 5, -4

Which number completes the inequality? 2/3 < _ < 7/9