In 3 seconds, kevin can dribble a basketball 13 times. if kevin dribbles at this same rate for 27seconds, how many times will he dribble the basketball?

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

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