What is the area of a triangle with vertices at (−2, 1) , (2, 1) , and (3, 4) ? Enter your answer in the box.

What is the volume of this square pyramid?

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11