John has 54 marbles. some are red and some are black. the ratio of the number red marbles to black are 7: 2. how may more red than black are there?

Which expression will have the same sum as 3_8 + 1/4?

Write an equation in slope intercept form of the line passes through the given point and is parallel to the graph of the given equation (0,0); y=3/8 x+2

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?