A circular mirror is 21 inches in diameter. It has a 1-inch wide wooden frame. You want to cover the outer edge of the frame with a copper strip. How many inches of copper do you need? (middle school)

The number of hours per week that the television is turned on is determined for each family in a sample. the mean of the data is 37 hours and the median is 33.2 hours. twenty-four of the families in the sample turned on the television for 22 hours or less for the week. the 13th percentile of the data is 22 hours. approximately how many families are in the sample? round your answer to the nearest integer.

Find the cosine function that is represented in the graph.

How is working backward similar to solving an equation?