What is the sum of the geometric sequence 1,4,16 if there are 8 terms

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?

In an equilateral triangle, each angle is represented by 5y+3. what is the value of y? a. 9.7 b. 10.8 c. 11.4 d. 7.2

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?