Is this set open or closed? [0,∞] and how is an infinity closed?

Which math sentence can be used to determine if the triangle is a right triangle?

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

Using graph paper, determine the line described by the given point and slope. click to show the correct graph below.(0, 0) and 2/3