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

For which of the following counts would a binomial probability model not be reasonable? a)the number of people in a classroom born in januaryb) the number of people in a classroom with red hair c) the number of people admitted to a hospital in a day with a particular disease d) the number of heart beats in a one-minute perio.

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

The trigonometric ratios sine and secant are reciprocals of each other