1. Determine the number of combinations of the letters of the word EXAMINATION given that four letters are taken at a time.
(5marks)

What is the size of the matrix resulting from

!! 10 ! a westbound jet leaves central airport traveling 635 miles per hour. at the same time, an eastbound plane departs at 325 miles per hour. in how many hours will the planes be 1900 miles apart?

2pointswhich of the following appear in the diagram below? check all that apply. d a. zcdeов. сеo c. aéo d. zdce