How many degrees does she rotate the telescope to see star b?

We have to use the law of cosines to solve for the missing angle.

cos(?) = (400^2 + 450^2 - 90^2) / (2*400*450).

Since, we want the exact value, we are going to take the inverse cosine of both sides

? = 10 degrees

The astronomer had to rotate her telescope 10 degrees to see star B

the answer is (-8,-5)

step-by-step explanation:

the endpoint to midpoint is half the length. the length is (-2,-1) so when you are at the midpoint just add it to it to find your answer -6+(-2)= -8 and -4+(-1)=-5 so (-8,-5)

he has now walked a total of what?

if i know what this is maybe i can

step-by-step explanation: