What are the roots of the equation 2x^2+16=11x in simplest a+bia+bi form?

Solve with work adding cheese to a mcdonalds quarter pounder increases the fat content from 21g to 30g. what is the percent of change ?

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect