Experts please tell what is the answer of this question.....
Subtract.

Dear Student,
Q8.a
Subtract 3x from -15x
= -15x - 3x
= -18x

Q8.b
Subtract 1/2 x² y from -2/7 x² y
= -2/7 x² y - 1/2 x² y
= {( -4 -7) / 14 } x² y 
= -11/14 x² y
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Kindly post other questions in a  separate thread.
Regards