The number 10 befotre 3305

What is the number 321,000,000 in scientific notation? also what is the number? ?

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

Mr. roseanne will buy 12 1/2 pounds beef for for a cookout. the price for the first 3 pounds of beef is $4.99 per pound. after that, the price is $4.49 per pound. how much will mr.roshan pay for the beef