Darla and Dave leave school each day at 2:00 P. M. on their bikes and travel in opposite directions. If Darla rides at a constant rate of 12 kilometers per hour and Dave rides at a constant rate of 14 kilometers per hour, after how many hours are they 65 kilometers apart?

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

If 7x=9y, y/z = 7/5 , then x/z = (a) 2/7 (b) 7/9 (c) 9/5 (d) 9/7 (e) 5/9

Solve 13 + w/7= -18 (w/7 is a fraction)