book Maths Puzzle Numerical Ability

Dear Tutor: This is my first year taking algebra I need your help really bad. Thank you so much:
Evaluate the expression for the given value of the variable:
1.4/3.x when x=1/6
2.24/x when x=3
3. 9d when d=0.5
5. 5/16-p when p=3/8

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book Other Question

Please help, have I done this correctly? I have nothing to compare it to.
Problem: (X^3/5 Y^-2)^5(2X^-4/5 Y^3)^3
Work: (X^3 Y^-10)(8X^-12 Y^9) = (X^3/y^10)(Y^9/8X^12) = X^3Y^9/8
X>9