Which greek geometer founded a philosophical society that devoted itself to the study of mathematics?

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

Consider the system: y = 3x + 5 y = ax + b what values for a and b make the system inconsistent? what values for a and b make the system consistent and dependent? explain

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radil and altitudes is 4: 3? 23