Atourist looks out from the observation deck of the space needle in seattle. the deck is at a height of 520 ft. she sees her friend on the ground below at an angle of depression of 85.6 degrees. what is the distance between the two? round your answer to the nearest tenth of a foot.

a. 40.0 ft
b. 518.5 ft
c. 521.5 ft
d. 527.0 ft

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

Ineed i been stuck on this question since yesterday