21 - 7x = 8x + 24 how do you solve this?

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles