Mark wanted to know how tall the tree in his front yard is. At the same time of day, he measured the length of his shadow and the length of the shadow cast by the tree. Mark, who is 5 feet tall, cast a shadow 10 feet long, and the tree's shadow was 140 feet long. How many feet tall is the tree?Mark wanted to know how tall the tree in his front yard is. At the same time of day, he measured the length of his shadow and the length of the shadow cast by the tree. Mark, who is 5 feet tall, cast a shadow 10 feet long, and the tree's shadow was 140 feet long. How many feet tall is the tree?

-3

step-by-step explanation:

a drawing really does here:

so i draw the horizontal line y=2 and the vertical line x=-2 at this intersection i put b (this is where my right angle is going to be).   so point b is at (-2,2).   point a is 5 units long and is also on y=2 so this point has to be (3,2) or (-7,2) -doesn't matter i will go with (3,2).

now we know c is at (-2,y) we don't know the y yet bet we know that c is on x=-2.

we have the area of the triangle is .5bh=12.5

we know the base length is 5 (ab)

we have the height is (2-y) if you look at your

plug in

.5(5)(2-y)=12.5

solve for y to get the y-coordinate for c

2.5(2-y)=12.5

divide both sides by 2.5 giving:

2-y=5

now subtract 2 on both sides

-y=3

y=-3

answer: group b.

step-by-step explanation:

d. all of the above

step-by-step explanation: