A submarine travels 168 miles in 7 hours. At this rate, how many miles will the submarine travel in 2 1/2

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Me asap! what is the slope of this line? enter your answer in the box.

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?