Jill is standing at the base of her apartment building. she measures the angle of elevation to the top of a nearby tower to be 40º. then jill goes to the roof of her apartment building, directly above her previous position, and measures the angle of elevation to the top of the same tower to be 30°. if the height of the tower is 100 meters, the height of jill's apartment building is

Its 31.2

Step-by-step explanation:

@Edufirst Check Your Work ("," ".")

x = 100/tan 40 = 100/0.8391 = 119.18 meters

y = 119.18 x tan 30 = 68.8 meters

100 - 68.8 = 31.2 meters

answer: d. $20

step-by-step explanation:

just took the test

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.