exam Maths Puzzle Numerical Ability

The set of non-zero complex numbers is closed under which operation(s)? Select all that apply.

a. Multiplication
b. Subtraction
c. Division
d. Addition

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As light penetrates a body of water , its intensity"I" measured in candela/cm^2 decreases exponentially. For one particular pond it is known that the light intensity at the surface

Please solve z+5 over 2 is less than 4-z over 7