If a sprinkler waters 1/12 of a lawn in 1/2 hour, how much time will it take to water the entire lawn?

What is the difference between regular convex and concave polygons

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)