3-5b=3-b-4b
no solution, one solution,
infinitely many solutions

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.