Which statement is sometimes true will give brainlist if righ and 10 extra points

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

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