Given the circumference of a circle formula, solve for r

Please answer!

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

Find the area of an equilateral triangle with a side of 6 inches

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min if they did not stop driving, how many miles could kyle and elijah drive in a whole day? ? 1 day = 24 hours. plzzz i will give you 100 points