exam Maths Puzzle Numerical Ability

Can you please help me with this problem? I am a little slow so you will need to break it down step by step. Thank you so much.
The square root of x^2 to the third power =9

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exam Other Question

a truck can be rented from basic rental for $50 per day. In addition, you have to pay $0.20 per mile. Continental charges$20 per day in addition to $0.50 per mile to rent out the (0.4x^2y^4)^2