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Since r varies directly with s, we have r = ks (replace k with 5 and s with 7) r = (5)(7) r = 35
pq-r, if p is 3, q is 4, and r is -6 is equal to 3 x 4 - (-6), which is equal to 12 + 6, which is equal to 18.
3 m/s
P=s r t , so, s= P/(st)