One solution, infinitely many solutions, or no solution for #13?

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

On the first of each month sasha runs a 5k race she keeps track of her times to track her progress her time in minutes is recorded in the table

*segment an is an altitude of right ? abc with a right angle at a. if ab = 2root 5 in and nc = 1 in, find bn, an, ac.