Question 1088408
Using distance formula sqrt (difference in x^2+difference in y ^2)
QR is sqrt (257)
RS is sqrt (1225+225)=sqrt (1450)
QS is sqrt (1296+1)=sqrt (1297)
square QR (257) add to it QS squared (1297) and get squared RS (1450).
No. 
But choices show RS as sqrt (558) it isn't given the difference in RS x which is -35 and -35^2=1225 and difference in RS y which is 15^2=225
slope of QS is (1/36)
slope of QR is 16
slope of RS is (-15/35) or -(3/7)
None of those 3 gives a negative reciprocal, so no perpendicular lines.