Please help me with this question! :)

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

Alcoa was $10.02 a share yesterday. today it is at $9.75 a share. if you own 50 shares, did ou have capital gain or loss ? how much of a gain or loss did you have ? express the capital gain/loss as a percent of the original price

|p| > 3 {-3, 3} {p|-3 < p < 3} {p|p < -3 or p > 3}