draw 8 lines that are between 1 inch and 3 inches long measure each line to the nearest fourth inch and make a line plot ​

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Bob is putting books on a shelf and takes a break after filling 18 1/2 inches on the book shelf. the book shelf is now 2/3 full. how long is the entire bookshelf?

Alex took his brother to a birthday party. the party was scheduled to last for 1 and 3/4 hours but they stayed for 4/5 of an hour more. how long did she stay at the party?