book Maths Puzzle Numerical Ability

How do I solve the below answer in scientific notation

4X10^-8/2x10^30

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book Other Question

solve equation using "t" substitution method:

12r^4-11r^2+2=0 (12r^4 just means 12r to the fourth, same with 11r^2) 15m-9-6m=9 I need someone to show me step by step how to work out this problem