2x+3y=15
x+y=6
work out the value of x and y

Tom drove 206 miles in 3.9 hours. estimate his average speed.

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?

The ratio of the height of two similar cylinders is 4 to 3 what is the ratio of their volumes