# math

posted by .

heres what it says on the paper. Using proportions, you can calculate the dimensions of objects without having to measure them. solve the problems that follow...
heres the problem
=====================================
amy is 5 feet tall and casts a 4-foot shadow. the pine tree has an 8 foot shadow. how tall is the pine tree..????

• math -

Here's the proportion:

Height is to shadow as height is to shadow. Let x represent the unknown -- the height of the tree.

5/4 = x/8

Cross multiply:

4x = 40

Solve for x.

x = 40/4
x = 10

The tree is 10 feet tall.

## Similar Questions

1. ### calculus

Jena. Stop it, or you will be banned. Using the chain rule, how do i solve this problem?
2. ### math

I'm trying to follow a research paper The paper shows an equation to minimize. That makes perfect sense. Then, the paper says: "The optimal solution to the least squares problem [above] is found by differentiation as a solution of …
3. ### Algebra

Solving word problem using quadratic equation. The book says the answer is 20 feet. I know how to solve the equation. I do not know where the 20 feet is coming from. Problem: Mr. Ingram wants to add a garage to his home. The dimensions …
4. ### Math 012

im having trouble with this one too. 6y-8=-6+3y+13 heres what ive done so far...not good. 6y-8=-6+3y+13 6y-8=7+3y -6y -6y 8=7-3y

My question is on scales etc.. heres the question | The Sears Tower is 1450 feet tall. If a model is 25 inches tall, find the scale.
6. ### math

Hi! I have a question Heres the problem: 3-2[6-(4y-1)] I got -8y-11 but it wasn't right and I don't know what i did wrong help please!
7. ### algebra uno help + check?

So, I've got these other sets of problems, that are telling me to write equivilant equations for the equations given, heres what I think. 1) x+y=-10 -5+5=10 -5(2)+10 2) 5x+10y=15 5x(3)=15 5x+10=15 3)-x+2y=9 y=3(3)=9 3+6=9 Heres what …
8. ### Businees and Technical Writing

Hello, I have Business and Technical Writing paper and it has me a little stumpped. I just don't know how I can fill the requirements of the paper by the detail scenario given. I am assuming that based on the scenario I can adress …
9. ### Math Homework Help

Hello! I'm having problems with these two math problems. I've tried to solve them but I got nowhere. If someone could please help me, that would great! Thanks again! :) Directions: Verify the identity for each problem. 1.) cot^2y(sec^2-y-1)=1 …
10. ### Math

1. To find the height of a pole, a surveyor moves 120 feet away from the base of the pole and then, with a transit 8 feet tall, measure the angle of elevation to the top of the pole to be 36*. to the nearest foot, what is the height …

More Similar Questions

Post a New Question