30 points, .
17. the colosseum in rome was the largest amphitheater built in the roman empire. the interior of the colosseum is a perfect circle. the roof of this enormous amphitheater was about 600 feet in diameter. if the center of the colosseum is assumed to be at origin, then write an equation for the circle that represents the roof of the colosseum. (justify)

The magnitude, m, of an earthquake is defined to be m=log l/s, where i is the intensity of the earthquake (measured by the amplitude of the seismograph wave) and s is the intensity of a “standard” earthquake, which is barely detectable. what is the magnitude of an earthquake that is 1,000 times more intense than a standard earthquake? use a calculator. round your answer to the nearest tenth.

Hurrya vegetable garden and a surrounding path are shaped like a square that together are 11ft wide. the path is 2ft wide if one bag of gravel covers 9 square feet how many bags are needed to cover the path

Atorch and a battery cost 2.50 altogether. the torch costs 1.50 more than the battery. what fraction of the total price is the torch? give your answer in its simplest form.