What is the constant rate of change from the graph?

a. 1/4
b.1/2
c.2
d.4

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?

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

Which equation represents h for right triangle abc