The Pythagorean theorem can be used for this.
.. (tip distance)² = (shadow length)² + (tree height)²
.. tree height = √((tip distance)² -(shadow length)²)
.. tree height = √((60 ft)² -(40 ft)²) = √(2000 ft²)
.. tree height ≈ 44.72 ft
The answer is B.) one of the numbers is negative.
So if you take the example...
-3 x -7 = 21
then we know that they equal a positive.
21 ÷ -3 = -7
Whenever you see <em>x </em> next to a 3, and it says that it equals 9, you know that 3•3=9.
15-6.9=8.1
8.1 x 3.9= 31.59
$31.59 is your answer
hope this helps :)
