Please help me I will give you the brain thing and extra points. (image below) 18/30

What situation is an example of an observational study

In triangle opq right angled at p op=7cm,oq-pq=1 determine the values of sinq and cosq

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.)