PLEAS HELP M AND PLEASE SHOW WORK solve by multiplying and adding
(5x+2y=-10) (3x+6y=66)

Which expressions are equivalent to -6 + 3m

42. if 20 men can eat 200 kg of wheat in 40 days, then 10 men can eat 300 kg of wheat in how many days? a) 120 days b) 60 days c) 80 days d) none of these

Asource of laser light sends rays ab and ac toward two opposite walls of a hall. the light rays strike the walls at points b and c, as shown below: what is the distance between the walls?