exam Maths Puzzle Numerical Ability

Solve the following equations.
a) sqrt x-1=3
b)sqrt x^3=8
c)^3sqrt x^2=4

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exam Other Question

Write the following phrase using symbols. The quotient of p minus q, divided by 5 Simplify.

(y^4/z^10)^3

This is my answer is it right?
y^7 / z^10