Aaron’s age is three years less than Devon‘s age the sum of their ages is 31 find each of their ages

Consider the line y = -3/-2 x +6. find the equation of the line that is perpendicular to this line and passes through the point (-9,-3). find the equation of the line that is parallel to this line and passes through the point (-9,-3).

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?

How can you find the mean absolute deviation (mad) for this set of data?