What is the square root of -16

-8i
-4i
4i
8i

Pls explain tooo

Suppose g(x) = f(x + 3) + 4. which statement best compares the graph of g(x) with the graph of f(x)?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?