exam Maths Puzzle Numerical Ability

I totally 4 got how 2 do this.....

Simplify

10y to the -3rd power times 3y to the 2nd power

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exam Other Question

how can I Solve and graph the solution please help

7(x - 3) ˃5x -14 I need to know how to subtract fractions of a number.
My problem is 15 - 2/3.

Thanks