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

apply the quadratic formula to find the roots of the given function, and then graph the function.

g(x) = x^2 + x + 12 True or false: The function "f(x) = 3x" grows three times faster than the function "g(x) = x". Explain