In 2015, there were about 22 million teenagers (aged 13-17) in the United States. They each sent an average per month. About how many messages did all of teenagers in the United States send each month? Express your answer using scientific notation

Tanya has $42 to spend at the dolphin island store. tshirts sell for $7 each and a pair of sunglases sells for $6.tanya buys 3 tshirts. how many pairs of sunglases can she buys with the amount of money she has left

Brent works part-time at a clothing store. he earns an hourly wage of $15. if he needs to earn more than $45 in a day and works for x hours a day, which inequality represents this situation? a. 15x > 45 b. 15x < 60 c. x > 60 d. 15x < 45 e. x < 60

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height