What is the greatest number which can be made using each of the digits 5,3,1,4,7

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

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

Given: p: 2x = 16 q: 3x – 4= 20 which is the converse of p - q? if 2x + 16, then 3x - 4 20. if 3x –4 +20, then 2x # 16. lf 2x = 16, then 3x - 4 = 20. lf 3x – 4= 20, then 2x = 16. o o