From a window 31.0 ft above the street, the angle of elevation to the top of the building across the street is 54.0° and the angle of depression to the base of this
building is 15.0°. Find the height of the building across the street.

the answer is vanilla

step-by-step explanation:

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.