-8+3k-10k-4+9-k simply

What is the area of triangle abc if a = 8, b = 11, and c = 15?

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

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°