Why is 150 ml of toothpaste for $2.79 a better buy than 100 ml of toothpaste for $1.79?

True or false? many triangular shapes can be circumscribed about a given circle

What is the solution of sqrt x+2-15=-3

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?