Charles places a mirror on the ground 63 feet from the base of a tree. he walks backwards until he can see the top of the tree in the middle of the mirror. at that point, jason's eyes are 6 feet above the ground and he is 9 feet from the image in the mirror. what is the height of the tree? .

Which of the binomials below is a factor of this trinominal? x^2-13+30

Cone a has a surface area of 384 ft2 and cone b has a surface area of 96 ft? . what is the ratio of their volume?

Sound travels about 750 miles per hour. a) suppose it takes about 1.5 seconds to hear the echo. how far away is the canyon wall, in feet? for this i got 825 ft b) suppose you stand 1,925 feet from the canyon wall and sound the horn. how long will it take to hear the echo? (i'm stuck on this)