3 (p-7)=3p-21 What is the properties of equality what is the properties of equality

What is the nth term rule of the linear sequence below? 27 , 25 , 23 , 21 , 19 , . .

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.

If there is no real number solution to the quadratic equation x^2+2x+c=0 what is a possible value of c? 1 -2 0 3