Find the area of each figure. Also correct any answers of mine that are wrong pls

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

You’re giving a cube with a length of 2.5 cm and a width of 2.5 cm and a high of 2.5 cm you place it on a scale and it is 295 g calculate the density