The second term of a GP is 18 and the fifth term is 486 find the first term and the common ratio​

Given a circle with a radius of 2 which is the length of an arc measuring 75

Agreeting card company can produce a box of cards for $7.50. if the initial investment by the company was $50,000, how many boxes of cards must be produced before the average cost per box falls to $10.50?

What could explain what happened when the time was equal to 120 minutes