What is the value of s ?

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

Is the point (0, 8) on the x-axis or y-axis? how do you know?