2x^2-19x+9=0 quadratic formula or zero product property. Which ever is easier?

$5400 is? invested, part of it at 11? % and part of it at 8? %. for a certain? year, the total yield is ? $522.00. how much was invested at each? rate?

Point m is located at (-4, -6). what is located 4 units from point m? ( its on a coordinate plane by the way. )

Ashley recently opened a store that sells only natural ingredients. she wants to advertise her products by distributing bags of samples in her neighborhood. it takes one person 22 minutes to prepare one bag. how many hours will it take to prepare 900900 bags of samples if ashley and 55 of her friends do the work?