exam Maths Puzzle Numerical Ability

This is the closest subject I could find, but the topic is Digit Problems. The question is: A two-digit number is four times the sum of its digits. The tens digit is 3 less then the units digit. What is the number?

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exam Other Question
For about what value(s) of x does g(x)=k(x) if g(x)=2x^2 -8 and k(x) =-x^2 -2?

x~ +or-2
x~ +or-2.3
x~ 1.4
x~ +or- 1.4 cube root(x-6)=2