The height of a triangle is 8 m more than twice the length of the base . The area of the triangle is 21 m^2 find the height of the triangle

The production line where you work can assemble 5 appliers every 30 minutes at this rate how long should it take the line to assemble 125 amplifiers

How do you use the elimination method for this question? explain, because i really want to understand!

On #16 : explain how factoring a trinomial, ax^2+ bx+ c, when a does not equal 1 different from factoring a trinomial when a = 1.