It depends on the value of x. By the way, I think you mean x^100 so I will answer based on that.
For 0<x<1, 3x > x^100
This is because x is a fraction which is less than 1. Therefore, multiplying it by itself will make an even smaller fraction whereas multiplying it by 3 (a number larger than 1) will make it a larger fraction. If you want to check this, try working it out using x = 0.1
For x>1, 3x <= x^100
This is because x is larger than 1 so it will increase when multiplied by itself. It makes sense that it should be greater than 3x in this case. Try using x = 2.
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100*x/75 % or 3x/4 %
-3x+4y doesn't have a maximum value because you can plug in anything for x and anything for y. In fact, if you keep x=0 and you plug in larger and larger numbers for y, you get a larger and larger output--it's unbounded.
5370
x=10
6/x=3/100; cross multiply 6*100 and 3*x; 600=3x; divide by three; 200=x