Question

Math question! Help please! Semester test tomorrowww!!

Answer 1

There it is :(

Answer 2

The answer for part B, the one I don't get is 3050, but I don't know how to get there.

Answer 3

Who told you the answer for B is 3050? That's not what I came up with.

Answer 4

Even though that's a REALLY big number, I realize I forgot to calculate the internal diameter. Hold on.

Answer 5

Okay.

I think I've got the answer.

Can you tell me how you started this problem?

Answer 6

The textbook says that..

Answer 7

Textbook's wrong. Over THREE THOUSAND washers can be carved from one square meter of metal?

Answer 8

Yes, so I did 3/0.0004= 7500 and thats the number of washers for question a

Answer 9

How did you get .0004?

Answer 10

Oh my gosh, never mind I get it!!

Answer 11

What do you get?

Answer 12

You know the formula for the area of a circle is (3.14 * r^2) ?

That's why I have no idea where you got the .0004

Answer 13

So it is 3050 :)

Answer 14

What's 3050?

Answer 15

Here's what I did:

I figured out the diameter of the entire washer.

The washer's EXTERNAL DIAMETER is 2 cm.

That means that the radius is 1 cm.

And that means that the area is 3.14 cm squared, which is the same as .0314 meters squared.

Answer 16

I found the AREA of the entire washer, sorry.

That's .0314 meters squared.

Answer 17

But the washer has a hole.

So now we have to find the area of the hole.

The DIAMETER of the hole (INTERNAL diameter) is 1 cm.

That means that the AREA of the hole is....

(3.14 * .5 squared),

which is .785 cm squared.

Answer 18

If you subtract that from 3.14 cm squared,

you get 2.36 cm squared,

which is the same as .0236 meters squared.

Answer 19

Can you tell me how you got .0004?