exam Maths Puzzle Numerical Ability

How do I know if a value is a solution for an inequality and how is this different from determining if a value is a solution to an equation?

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exam Other Question

C-17 Without using the Pythagorean theorem find the missing angles. Side d is 10, side B inside is 60 degrees, find side A. Solve for x:
a)(2x-1)^1/2=sqrt3
b)8^(2x)+8^x=0
c)(x+3)^(2/3)=4