A octagonal pyramid has a base with area of 225 sq in, and a height of 20 in. What is its volume?

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

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?

5, 6, 10 question: a. determine whether the side lengths form a triangle. (explain your reasoning) b. if it is a triangle, determine whether it is a right, acute, or obtuse triangle. (show your work)