For which value of θ is sinθ= -1? A. pi/2
B. pi
C. 3pi/2
D. 2pi

Please help, I'm having a lot of trouble understanding this stuff

Fred has a spinner that is split into four equal sections: red, blue, green, and yellow. fred spun the spinner 688 times. which of the following would be a good estimate of the number of times the spinner lands on the green section? a. 269 b. 603 c. 344 d. 189

What is the measure of angle x? answer

*segment an is an altitude of right ? abc with a right angle at a. if ab = 2root 5 in and nc = 1 in, find bn, an, ac.