Question 313119
The distance from the midpoint to P is the same as the distance from the midpoint to Q.
x:P to M, {{{DELTA*x=Mx-Px=-7-1=-8}}}
y:P to M, {{{DELTA*y=My-Py=7-(-3)=10}}}
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x:M to Q, {{{Qx=Mx+DELTA*x=-7+(-8)=-15}}}
y:M to Q, {{{Qy=My+DELTA*y=7+10=17}}}
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Q=({{{-15}}},{{{17}}})
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C) is the correct answer