Wednesday

March 1, 2017
Total # Posts: 1,524

**Chemistry**

The most abundant isotope of the element nobellum has a half-life of 58 minutes. After 174 minutes the sample has a mass of .300 mg. What was the orignal mass of the sample? A. 1.20 mg B. 4.80 mg C. .600mg D. 2.40 mg

*May 23, 2010*

**chemistry**

Ba-140 has a half life of 13.0 days. What fraction of a sample will remain after 39 days?

*May 22, 2010*

**Chemistry**

The half-life of xe-133 is 126 hours. Starting with 250 mg, after 500 hours around how many mg remain?

*May 22, 2010*

**6th Grade Math**

yellow

*May 18, 2010*

**social studies**

sailor

*May 18, 2010*

**science**

what

*May 18, 2010*

**algebra**

how would you solve the follwing equation? (2c/c-4)-2=(4/c+5)

*May 17, 2010*

**math**

628. if there is more than 6 ones, its 628. if it says more than 6 ones, inclusive than it could be both.

*May 17, 2010*

**Geometry**

i believe it would be 56.52 (not 100% positive though) because if the radius is 6, then the circumference would be 3.14(6^2)= 3.14(36) which is 113.04 then you would put that over 360 and set up a proportion: 113.04/360 = x/180 (simplified to 20347.2/360) which gives you a ...

*May 17, 2010*

**math**

i think it would be 8 to 1 because 4000 -> 500 so 400->50 and 40->5 which would be 8->1

*May 17, 2010*

**algebra**

each week, mandy's algebra teacher gives a 10 point math quiz. after 5 weeks, mandy has earned a total of 36 points for an average of 7.2 points per quiz. she would like to raise her average to 9 points. on how many quizzes must she score 10 points in order to reach her goal?

*May 17, 2010*

**Social Studies**

india and china

*May 15, 2010*

**pyschology 1**

How would you use classical conditioning, operant conditioning, and observational learning to improve your academic performance? Give one example for each type of learning.

*April 18, 2010*

**MATH/OPTICS**

given di=145, do=38,hi=-97 formula: hi/ho=-di/do how do i rearrange this?? i do not want the answer. need help rearranging equation please help!!

*April 12, 2010*

**English**

It's A, because demonstrative pronouns = this, that, these, those.

*April 5, 2010*

**biology**

In mitosis, what is the size of a daughter cell relative to the size of the parent cell? If an onion cell has 10 chromosomes, how many double chromosomes does an onion cell have at the start of metaphase? Thanks!

*April 2, 2010*

**Chemistry**

Which of these is true about the following reaction? NaOH + HCl ¡æ NaCl + H2O A. NaOH is the proton acceptor. B. HCl acts as the Br©ªnsted-Lowry acid. C. NaOH and HCl are the products. D. This is an example of a neutralization reaction. E. The products ...

*March 29, 2010*

**Chemistry**

How much heat is given off when 24.0 g of methane is burned in air? The equation for the reaction is: CH4 + 2O2 => CO2 + 2H2O + 890 kJ What equation or formula should I use to solve this? Thanks!

*March 29, 2010*

**SCIENCE: GR.10 OPTICS CONVEX MIRRORS**

A convex security mirror has a focal length of -0.25m. A person with a height of 1.5m is 4m from the mirror. calculate the image distance and image height. AND An object 0.4m tall is placed 2.5m in front of a convex mirror that has a focal length of -90cm. Calculate image ...

*March 28, 2010*

**science optics**

A cosmetic mirror is 50cm from your face and the magnified image of your face is upright. You are told that the focal length of the mirror is 45cm. Explain why this focal length is not possible. I understand that the image would be magnified and upright...that's about it

*March 28, 2010*

**Math**

What is the product of the sum of 1.3 and 0.9 and the difference of 1.2 and 0.8

*March 22, 2010*

**p.e theory**

explain how stregths and weaknessess can affect your health and efficency in sport?

*March 14, 2010*

**Physics**

Thank you.

*March 8, 2010*

**Physics**

A rectangular piece of gold is 3.1 cm long and 3 cm wide. Resistivity of gold is 2.4*10^-8. How deep is the piece when it displays a resistance of R = 1.65 μω for a current that flows along the depth-direction? I used R=(p*l)/A and solved for l. I got the answer ...

*March 8, 2010*

**MATH**

how do you change metric units

*March 3, 2010*

**Math**

The formula for Simple Interest is Interest= Principle x Rate x Time. You fill in the formula- ?= 7540 x 4.5% x 10. Then, you turn the rate into a fraction- 0.045. Fill in the formula again, 7540 x 0.045 x 10, you multiply. 7540 x 0.045 x 10 = 3393. The interest after ten ...

*March 1, 2010*

**Science**

If my project is about a lie detecting project waht would be my independent, dependent, and controlled variable?

*February 28, 2010*

**biology**

Which objective (4x, 10x, or 40x) has the shortest depth of focus? Thanks for the help!!

*February 27, 2010*

**5th grade**

look in the dictionary

*February 24, 2010*

**viking age**

who are the vikings and what are their daily life, thank you

*February 20, 2010*

**music**

Character

*February 11, 2010*

**Math**

what is the total cost of the rechargeable batteries and battery chager?

*February 8, 2010*

**English - Mari Djata**

i think C

*February 1, 2010*

**Chemistry**

Approximately how many grams of NaNo3 will dissolve in 100g of water at 20 degrees Celsius?

*January 28, 2010*

**algebra**

Write a word phrase for 5p

*December 11, 2009*

**math**

Thank you! :)

*December 10, 2009*

**math**

So it would be half of his piece?

*December 10, 2009*

**math**

I'm doing a problem, and it says "Robert has a piece of twine that is 3/4 yard long. He needs a piece of twine that is 2/3 of this length. How long of a piece of twine does robert need?" Help?

*December 10, 2009*

**math**

How do you write repeating decimals as fractions? There's directions in my book,but I don't understand it? For example, how would you write as a fraction 0.81 with the 81 repeating?

*December 7, 2009*

**Physics**

To suck water up a straw to a maximum height of 187 mm, what minimum gauge pressure must be produced in the lungs? Note that in order to be able to suck up water, the pressure in the lungs must be lower than the pressure outside by the exact amount of pressure created by the ...

*November 25, 2009*

**crt 205**

I need to identify two arguments and define the premises and conclusion. I have to tell weather it is deductivly valid or inductivlely strong or in valid or weak and why. In the appendix 1 article Controlling Irrational Fears After 9/11. Can you help with this.

*November 22, 2009*

**math**

It becomes 17? But usually with problems like these aren't you supposed to subtract since it's an addition problem?

*November 13, 2009*

**math**

So the problem is 9 = w + (-8) I know the answer is 17. But I don't know how I solve it/show work.

*November 13, 2009*

**Writing**

Ooops! I'll try to find a word to substitute that.

*November 12, 2009*

**Writing**

Is "confidentialationalize" spelled like that?

*November 12, 2009*

**URGENT Grammar**

I think it is mental. Am I correct?

*November 12, 2009*

**URGENT Grammar**

Are you absolutely sure? You might be correct.

*November 12, 2009*

**URGENT Grammar**

In the sentence "She approved the apposed marriage" is approved a: (a)linking verb (b)action verb (mental) (c)action verb (physical)

*November 12, 2009*

**Grammar**

Then it must be an action verb mental.Right?

*November 12, 2009*

**Algebra**

For each function, find three ordered pairs that lie on the graph of the function. -6=3x+2y

*November 9, 2009*

**travel and tourism**

$2.

*November 9, 2009*

**math**

Solved both!

*November 6, 2009*

**math**

I figured out the first one. Still trying number 2.

*November 6, 2009*

**math**

1.Explain why there is no number that can replace N to make the equation |n| = -1 true. 2. List the integers that can replace N to make the statement -|8| < n < -|-5| true. I don't really get what am I supposed to do?

*November 6, 2009*

**to kill a mockingbird**

I'm reviewing for my test about the novel "To Kill a Mockingbird". There's this question I can't answer: 1. What are the generalizations (like stereotyping) made about black people? Who makes them? And how are black people affected by it? The same ...

*October 28, 2009*

**math**

In my book, it says to use a number line to find the sum of the equations. Should I draw a numberline on my paper, or just write down the answer on the paper?

*October 22, 2009*

**physics**

Work= force * distance Multiply 12.0 m and 25 N and that's your answer

*October 21, 2009*

**math**

15 ***********--------- *********/| | ********/ | | 20 *****25/ | | ******/ | | *****/____|________| *****15*******15

*October 20, 2009*

**math**

Ahh. The shape didn't show. Basically, it's a rectangle with like a triangle on the side of it. 15 on the top, 25 on the side with the triangle point, 20 on the right side, 15 on the bottom, where the triangle is. and 15 on the bottom of the rectangle

*October 20, 2009*

**math**

So, I need to find the area of this shape. It's an irregular shape, and I don't know how to figure it out. The shape looks like, 15 -------- /| | 25 / | | 20 / | | / | | /____|______| 15 15 I was told the answer was 450. Though I don't know how to figure 450 out?

*October 20, 2009*

**math**

i still don't get what a prime number is?

*October 17, 2009*

**math**

The formula for the area A of the triangle is A=1/2BH, where B is the length of the base, and H is the height. Solve the equation for B. I don't know how I'm supposed to be able to figure this out?

*October 16, 2009*

**math**

What are algebraic models? There's a problem and it says to use an algebraic models to answer the questions. I don't know what those are?

*October 13, 2009*

**math**

What is 7(y+3)+2y simplified? and if possible, can you break down how you got it? Simplifying equations confuses me easily.

*October 13, 2009*

**Math**

sue correctly answered 42 of the 50 questions. what percent of the questions dud she answer correctly?

*October 8, 2009*

**Science**

Thanks!

*October 4, 2009*

**Science**

What is the difference between direct and indirect sunlight?

*October 4, 2009*

**social studies,word unscrambler**

what???? :)

*September 28, 2009*

**art(need help)**

i know these are a few questions but i just can't find them anywhere.i really need to know why the bauta mask was made,how you make one,who made it, and it's texture.if you could help me with any of these,i would be so thankful.

*September 21, 2009*

**art**

I just need to know who made the'bauta mask"?

*September 19, 2009*

**biology**

which animals eat butterflies? i know that birds do feed on butterflies even though they are hard to catch, but what else? please tell me any other animals that feed on butterflies. thanks you.

*August 27, 2009*

**CRT 205**

Taking a position

*August 27, 2009*

**Advanced Mathematics**

find the distance bewteen points at (6,-3) and (-1,4). The answer I got was 9.9 and it was wrong. please help!

*July 9, 2009*

**physics**

what is the distance traveled by a vehicle in 12 minutes, if it's speed is 35km/h? And the answer I got was 7km but I got it wrong. Please help!

*June 29, 2009*

**Math (ratio)**

5 4900

*June 27, 2009*

**Advanced Mathematics**

verify that cos(90+A)=-sinA is an identity.

*June 22, 2009*

**digital design**

How can you utilize contrast in your designs, yet still retain an overall sense of balance?

*May 29, 2009*

**english**

thank you

*May 21, 2009*

**english**

Does anyone know where to go for information on breast cancer?

*May 21, 2009*

**Math**

I want to find out how a hexagon and a square tessallate together?

*April 25, 2009*

**Math**

Can you wait till tomorrow? or do you need the answers now?

*April 21, 2009*

**Math**

Sure no problem. The probability is 1 out of 2.

*April 21, 2009*

**Math**

I believe the probability of rolling a 6 would be 1 out of 8.

*April 21, 2009*

**math**

Do you need to find the ? as well?

*April 20, 2009*

**math**

What is the y-intercept?

*April 20, 2009*

**English**

Can you please proofread: Aging is something that everyone will experience. Having the opportunity to explore four different types of living facilities, really was an eye opening experience, about how genuine life really is. Being able to gain educational background about the ...

*April 15, 2009*

**Proofread**

I did cite my sources in my final essay.

*April 15, 2009*

**Proofread**

Can you please proofread this for me for grammar mistakes thank you. British American novelist Amelia Barr once stated “old age is the verdict of life”. Aging is a natural process of life that effects all of us. Sociologists see aging as a process of socialization or...

*April 15, 2009*

**math**

what catergorie capital and comission fall under. i think capital is owner equity and comission is income statement.

*April 14, 2009*

**accounting**

sorry i ment income stATtement becuse its expense. im i right

*April 13, 2009*

**accounting**

utilities in the catergorie owner equity i think. if not is it income statement or balance sheet.

*April 13, 2009*

**accounting**

does withdrawls fall in the catergorie income statement.if not please correct. the other two choices are statement of changes in owner equity or balance sheet.

*April 13, 2009*

**Chemistry**

melting point

*April 13, 2009*

**math**

if sin theta equals 3/5 and theta is second quadrant angle find tan 2 theta.my ans. was 3.442 but is wrong can you correct and show work please. thank you so much.

*April 10, 2009*

**math**

write xy as the sum of unit vectors for x (8,2,negtive 9) nd y (negative 12,negtive 1, 10). my ans was negative 4i plus j plus k. wrong can you correct it for me please . thank you.

*April 10, 2009*

**math**

use the sum or difference identify to find the exact vlue of tan 105 degree.my ans.sqrt plus (3) plus 1 . wrong so can you correct it for me please thank you .

*April 10, 2009*

**math**

find the value of sin theta for angle theta in standard position if point with coordinates (negtive 3, 2) lies on its terminal side. i had 2 over sqrt 13 but it was wrong please correct.

*April 10, 2009*

**math**

write parametric equtions of y equals 5x minus 2. i put y equals 5 plus 2 but i was wrong can you correct me thankyou

*April 10, 2009*

**math**

write the equation 5x plus y equals 2 which equals 0 in normal form. my ans. was y equals 5 plus negative 2 or y equals 5 plus 2. if im wrong plus correct and explain why im wrong thank you.

*April 10, 2009*

**physics**

A 5.0-cm real object is placed at a distance of 30.0 cm from a concave mirror of focal length 10.0 cm. Find the location of the image. ANSWER: C Height of the object = 5.0 cm Distance = 30.0 cm Focal length = 10.0 cm This is the equation: 1/Do + 1/v = 1/f which means: 1/[...

*April 6, 2009*