Alength is measured as 21 cm correct to 2 significant figures
a) what is the lower bound for the length?
b) what is the upper bound for the length?

Arandom high school question but a hard one

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?

Maria walks a round trip of 0.75 mile to school every day. how many miles will she walk in 4.5 days