# Posts by Sahana

Total # Posts: 25

**physics**

a ruby laser emits light at wavelength 694.4nm. if a laser pulse is emitted for 12pico seconds and the energy released per pulse is 100mJ, what is the length of the pulse?

**Science/Physics**

use his compass

**Math**

Hi. I found this question on a Math Counts practice test and it seriously confused me. I've never learned about this, and it would help if someone helped me. Thanks in advance. How many elements are in the intersection of the set of all the prime numbers less than 30 and ...

**social studies**

They are totally different topics...But I suppose that it CAUSED the French and Indian war, but I'm not sure...

**math**

The 55 days is extra information put in the question to confuse you.

**science**

Thinking logically, I would go with your theory, but after I looked at the Wikipedia page, I realized that your mom is right. Logic is not always the right solution. :)

**social studies**

To be in poverty means you do not have the supplies/money to survive through your basic needs--Food, Clothing, and Shelter

**math**

Every day a commuter takes a train that arrives at her station at precisely 6:00 pm. She is met at the station by her husband, who also arrives at precisely 6:00 pm. He always drives the same route to the station and never varies his speed. One day the commuter takes and ...

**math**

you want to estimate 5.25-3.3. why would using front-end estimation and adjusting tell you more about the answer than rounding?

**Math**

I know the answer to this question, but I want to find a simpler way of doing it... ---Find the sum of the counting numbers from 1 to 25 inclusive. In other words, if S= 1+2+3+...+24+25, find the value of S. Thanks!!!!!

**4th grade**

Prime:13,37,67 Composite:25,117208

**algebra**

trut

**4th grade**

You always want to move the numbers to one side and the variable to another side to do that... 25+7=p-6 Move the 6 to the other side. Since its a minus make it a plus... 25+7+6=p 38=p There you have your answer!

**Reading**

I'm not sure either, but I think it is words that is made up by your mind.

**4th grade**

thank you

**4th grade**

I think i know how to divide decimals, but I want to learn more. Can someone help me?

**4TH GRADE MATH**

Depends on what kind of pentagon your talking about. A pentagon is just a shape with 5 sides. It could mean anything.

**Math: 4th grade**

1) 23-x 2)23(x-3)

**4th grade math**

The answer would be 2,400,000

**4th grade**

What you have to do is work backwords. First since it says"you get 8" and before that is says "divide by 7" you have to multiply 8x7 because your working backwords. Then it says to multiply by 2, you have to divide by 2. 8x7 is 56 and 56/2 is 28. Now you ...

**4th grade**

There is a subject and a predicate in every sentence. The Subject is the main part of a sentence. For example- Susie is writing a story. Susie is the Subject. The predicate is the remaining words.

**Math**

Mental Math is practically doing math in your head. That's why the word mental meaning "mind" is in Mental Math.

**4th grade**

The commutative property works the same way with only multiplication and and addition. It means that no matter if you switched the numbers around, it will always equal the same.

**Ordering decimals**

What you have to do is look for the highest tenth number. if some of them are the same look in the hundreths. If those are the same look in the thousandths. Then you keep on going.

**4th grade math**

37-1x-2