Why is the latter done like this? (0.225 p 0.1 p 0.15 p 0.175 p) (# 0.65 p)

Two fire-lookout stations are 190 miles apart, with station a directly south of station b. both stations spot a fire. the bearing of the fire from station a is upper n 55 degrees upper e and the bearing of the fire from station b is upper s 60 degrees e. how far, to the nearest tenth of a mile, is the fire from each lookout station?

Use set buikder notation to represent the following set: {, -2, -1, 0}

What is the frequency of the sinusoidal graph?