In 2010, the population of Brazil was about 1.987 x 108 people. The population of Lithuania was about 3.555 x 10 people. What was the total population of both Brazil and Lithuania? Write your answer in scientific notation.​

Germaine walks at the rate of 10 feet every five seconds while nolan walks at the rate of 15 feet every five seconds. if germaine has a head start of 25 feet, how many seconds will they be at the same spot?

For each proportion find the unknown number x 1/5/8=×/15

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.