91Ó°ÊÓ

a. Write your own example of an expression that includes three operations. Design the expression so that the evaluated expression equals a whole number. b. Evaluate this expression.

A student was mixed up about the order of operations and always did multiplication first before she did any division. Write an expression in which doing this will result in an incorrect answer.

$$ -12-5 $$

$$ -0.4-0.9 $$

For exercises 101-104, evaluate. Use a scientific or a graphing calculator. $$ -80 \div(-2)+4(-6)^{2} $$