Jack has 2,613 songs saved on his computer. dexter has 4 times as many songs saved on his computer as jack has. how many songs does dexter have saved on his computer?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

Indicate the equation of the given line in standard form. the line containing the longer diagonal of a quadrilateral whose vertices are a (2, 2), b(-2, -2), c(1, -1), and d(6, 4).