Lea left Sarawong's house and traveled toward the town hall at an average speed
of 70 km/h. Sometime later Jacob left
traveling in the opposite direction with an
average speed of 70 km/h. After Lea had
traveled for two hours they were 280 km
apart. Find the number of hours Jacob
traveled.

i dont know sorry

step-by-step explanation:

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2