Use any method to solve the equations below.

a. x2+3x=4 b.(2x+3)(x-4)(x+4)=0

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

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?

The value of cos 30° is the same as which of the following?