A rain drop randomly drops on the keys of a piano, what is the probability that the drop landed on a black key? (Assume that the drop had to land on a key and did not land on two at the same time).

Data was collected on myrtle beach for 11 consecutive days. each day the temperature and number of visitors was noted. the scatter plot below represents this data. how many people visited the beach when the temperature was 84 degrees?

Simplify the expression. -2/5(10+15m-20n)

Which system of linear inequalities is represented by the graph?