Find the next number in the series 3, 9, 81, 6561

There were 567 people at a concert when a band started playing. After each song, only one-third of the people stayed to hear the next song. How many people were left at the concert after x songs? Write a function to represent this scenario.

Leila takes classes at both Westside Community College and Pinewood Community College. At Westside, class fees are $98 per credit hour, and at Pinewood, class fees are $115 per credit hour.

Joanne's dress hop received an invoice dated july 25 for $1400 with terms of 2/10, 1/15, n/60. On August 8, Joanne's Dress shop sent a partial payment of $750. The actual amount that should be credited is:

A fish descends at a rate of 18 inches per second. What is the depth of the fish after 12 seconds?

An event lasts 1,920,000 milliseconds. Approximately how long did the event last in hours?

What is the 9th square number.

For what values of k does the graph of y=-2x^2+5x+k not cut the x-axis? I want the working out to be detailed on how exactly do we solve this question.

What is the equivalent of 90° in radians?

A car dealership sold 215 cars in April. The dealership wants to increase the number of cars sold by 10% in May. How many cars will the dealership need to sell to reach their goal?

Students were asked to vote for the leisure activity they liked best. The data are shown in the table. A 2-column table with 5 rows. Column 1 is labeled Number of Votes with entries 18, 22, 34, 28, 8.