exam Maths Puzzle Numerical Ability

Please help me solve for x:
a) 5x(^1/2)=20
b) 8x^-3=64
c) 8(x-2)^3=27
d) (x+3)^sqrt2=25^sqrt8

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exam Other Question

Product Rule for exponents: If c, d, and w are real numbers and w not equal to 0, then w to the c power 2 to the d power = _________________. An employee who produces x units per hour earns an hourly wage of y = 0.85x + 8 (in dollars). Find the hourly wage for an employee who produces 10 units per hour.