Answer:
151 mol Ne.
Step-by-step explanation:
I did work on Paper sorry if i can't type it, It'll mess it up.
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Change 48% to 0.48
0.48 x 18 = 8.64
rounded would be 9
X2 - 16, is the answer. The first one.
x^2 - 16 = (x)^2 - 4^2, difference of two squares :)