The average of 9 numbers is 140. one of the numbers is 180. what is the average of the other 8 numbers?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?

Astudent was asked to find the square of 7x+3. the student quickly wrote (7x+3)^3= 49x^2+9. identify the student's error and provide the correct answer.