Four balls of wool will make 8 knitted caps how many balls of wool will malcolm need if he wants to make 6 caps

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Which choice represents the sample space ,s for this event

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists