Simplify the expression. Write the answer in scientific notation.
(0.1*10') (2x 10-9)

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Which of the following represents a function? 50 !