Select the interval where h is positive.
Pleaseee HELP

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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?

Is this a polynomial function? i need to know asap