book Maths Puzzle Numerical Ability

The price in dollars (p) plus 5.75% sales tax is $10.52. Find p.

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book Other Question

identify the root to the nearest tenth.
y=4-x^2
i came out with x=-2.1 and x=1.9, but i am not sure if this is correct. These things are hard for me, can you please help?

simplify

cubed rt 9x^2y * cubed rt 3x^3y^2

Is the answer 3xy cubed rt 3x^2?

Thanks