What is the slope of the line that passes through the points (1,-6) and (-8,9)

Which statements are true? see picture

In triangle opq right angled at p op=7cm, oq-pq=1 determine the values of sinq and cosq

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.