The densities of three metal alloys, A, B and C, are in the ratio 13: 15:21
1 mº of alloy B has a mass of 8600 kg.
Work out the difference between the mass of 5 m of alloy A and 3 m of alloy C.
Give your answer correct to 3 significant figures.

Anew fountain in the shape of a hexagon will have 6 sides of equal length. on a scale drawing, the coordinates of the vertices of the fountain are: (7.5,5), (11.5,2), (7.5,−1), (2.5,−1), (−1.5,2), and (2.5,5). how long is each side of the fountain?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Which compound inequality could be represented by the graph?