The bobcats football team gained 15 yards on their first play then lost 9 yards on the next play. Write an addition expression to represent this situation. Find the sum and explain its meaning

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.

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.