If v1 = (-2,5) and v2 = (4,-3), then the angle between the two vectors is . Round your answer to two decimal places.

Two technicians are discussing oil changes. technician a says that waste oil and old filters need to be disposed of according to the law. technician b says that old filters can be returned to the parts department for a core value. which technician is correct?           a. technician a only   b. both technicians a and b   c. technician b only   d. neither technician a nor b

Thayer sometimes finds it difficult to understand what his instructor is saying. he raises his hand in class and asks his instructor to elaborate on what was just said, but it rarely . what should thayer do to overcome this obstacle? a. during class, ask other students what the instructor means b. raise more questions in class c. join a study group of his peers d. try to do the best he can with the information he has

Territorial insects like spiders that fight off intruders would be expected to be a) regularly distributed b) randomly distributed c) clustered together d) b and c e) selectively distributed