At blood drive, 5 donors with type O+ blood, 5 donors with type A+ blood, and 2 donors with type B+ blood in line. In how many distinguishable ways can the donors be in line?

Prove that 16^4-2^13-4^5 is divisible by 11.

Andy wants to find the distance d across a river. he located points as shown in the figure, then use similar triangles to find that d = 223.5 feet. how can you tell without calculating that he must be wrong? tell what you think he did wrong and correct his error. round your answer to the nearest tenth if necessary. andy must have used the wrong . the distance d is actually feet.

What is the recursive formula for this sequence . 10,14,18,22,26