A whale is at the surface of the water. The whale then swims to a depth of −100.6 meters. How many meters does the whale swim?

Suppose there are 10 five and six-year-old attending a birthday party. when a 30 year old mother walks into the room with an infant in her arms, what happens to the mean age in the room? what happens to the standard deviation of ages in the room? a. the mean and standard deviation of both change. b. the meaning will change, but the standard deviation will stay approximately the same. c. i mean will stay approximately the same, but the standard deviation will change. d. the mean and standard deviation will both stay approximately the same.

Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11

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