In sunlight, a vertical stick 6 ft tall casts a shadow 2 ft long. at the same time a nearby tree casts a shadow 14 ft long. how tall is the tree? round to the nearest tenth< br /> < br />
a) 42.0 ft< br />
b) 85.7 ft< br />
c) 18.0 ft< br />
d) 52.5 ft< br /

Alrighty friend, let me explain you a math.
We're gonna want to start by setting up a fraction. We'll set up the fraction as height/shadow. The stick's height is 6 feet and the shadow is 2 feet, making the fraction 6/2. The second fraction only gives us the shadow, so the fraction is x/14. 
Now, we're gonna do some cross multiplication m8. 6/2 x x/14. Multiply 6x14= 84 and 2x(x)= 2x ---> 2x = 84
Do you some basic algebra here, and divide both sides by 2. 
Your final answer is 42, so the tree is 42 feet tall.

Set square i think so