Wednesday

April 16, 2014

April 16, 2014

Total # Posts: 1,970

**chemistry help~~~~ Please!!!**

Sodium-24, t1/2 = 15.0 hr, can be used to study the sodium balance in animals. If a saline solution containing 25 μg of 24^Na is injected into an animal, how long can the study continue before only 1 μg is left? Show work please!

**chem 101**

How many kilojoules of heat are needed to completely vaporize 42.8 g of C4H10O at its boiling point? Given Hvap=26.5kj/mol

**algebra**

Ln(x+3)- Ln(x-5)=Ln7

**algebra**

In 1990, the population of Africa was 643 million and by 2000 it had grown to 813 million. a.) Use the exponential growth model A=A0 e^kt, in which t is the number of years after 1990, to find the exponential growth function that models the data. b.) By which year will Africa ...

**Calculus Help Please!!!**

A radioactive substance has a half-life of 4 days. Suppose we have 800 mg of this substance. a) Find the equation of the mass remaining after t days. Use the exact value for k not a decimal approximation. b) Rounding your answer to the nearest tenth of a mg, find the mass rema...

**financial management**

Post your response to these questions: A budget systems model is the foundation from which budgeting systems can be used to evaluate the success of an agency or company. How are performance budgeting systems used to evaluate the efficiency and effectiveness of a human service ...

**social studies 9**

explain why the mohawks and the other first nations would choose to become allies with europeans, even though they knew that all the europeans were a threat to their territory and way of life

**math**

Find the foci x^2/49 + y^2/36 = 1

**Calculus Help Please!!!**

Find the absolute maximum and absolute minimum values of f on the given interval. f(x) = xe^((−x^2)/98), [−6, 14]

**social studies 9**

thank you

**social studies 9**

why are people who are attached to religious orders ideally suited to leave their home country and take residence in a new land

**Calculus Help Please!!!**

Compute Δy and dy for the given values of x and dx = Δx. (Round your answers to three decimal places.) y = 3x − x^2, x = 3, Δx = −0.6 Δy=???

**Math **

for the function y=-(1)/(x-3/4) describe the intervals where the slope is increasing and where its decreasing

**Calculus Help Please!!!**

A water trough is 5 m long and has a cross-section in the shape of an isosceles trapezoid that is 30 cm wide at the bottom, 70 cm wide at the top, and has height 40 cm. If the trough is being filled with water at the rate of 0.1 m3/min how fast is the water level rising when t...

**Chemistry Help Please!!!**

What is the greatest source of error for the hydrolysis of salts and pH of buffer solutions lab?How would you minimize this source of error?

**Math for grade 6 peace**

The computer club is having a fundraiser to help pay for a trip to the science museum. So far they have raised $96, which is only 48% of their goal. How much money are they trying to raise?

**math**

Thanks for answering!

**math**

Kara eats 4/5 of the food that Jillian does. If kara needs to bring 14lbs of food for the week, how much does Jillian need to bring.

**math**

How do you find the area of a circle with a diameter of 26 feet???

**Calc Help :(((((**

I got up to here. f'(x)= 3(x+3)^2(x8)^5(d/dx(x))+5(x+3)^3(x-8)^4

**Calc Help :(((((**

Find the derivative of the following function showing your work and fully simplifying your answer. Show steps please! Thank you!!!!!! f(x)=(x+3)^3(x-8)^5

**Calculus Help**

A model for the length of daylight (in hours) in Philadelphia on the tth day of the year is L(t) = 12 + 2.8 sin[(2π/365)(t − 80)]. Use this model to compare how the number of hours of daylight is increasing in Philadelphia on March 21 and April 21. (Assume there are...

**Calculus **

for what values of r does the function y=e^rx satisfy the differential equation y''-4y'+y=0 Show steps please! Thank you!

**social studies 9**

Create a dialogue between a Huron chief and a Jesuit missionary in which both present their best arguments for and against allowing the Jesuits stay and work in Huronia.

**social studies 9**

What social values would have led Jacques Cartier to kidnap the sons of the Iroquois host at the Gaspe Peninsula and take them to Europe?

**HELPPPP NOOWW !!!!!**

her she I I them indirect object of preposition none of above hers his yours its

**banking**

Suppose you borrow $5,000 and make 12 equal payments to retire the debt. If the finance charge for the loan is $400, what will the amount of each monthly payment be?

**banking**

If 6 percent of all credit card charges never get paid, and total credit card charges last year were $750 billion, what was the total amount of unpaid credit card charges last year?

**Banking**

Becky has a balance of $2,000 on her credit card. Her minimum payment is $40 on a card with an APR of 17 percent. How much of that payment will go toward paying the interest?

**chem**

How many moles of CO2 are produced from 0.160mole O2?

**statistics**

the average score on the statistics quiz was a 70, and there was a standard deviation of 10 points. If the z-socre was -1.0 what is the percentile rank?

**Science**

Type webelements in your search box, and that website will give you all the kind of information of all kinds of elements. Just click: Chemistry » Periodic Table » essential data and description

**Help!**

I think; I believe it's C. The new director promised to restore order in the department

**Math **

Determine an equation in simplified form, for the family of quadratic functions with zeros -1 -+ √5 and 2 -+ √2 B) determine an equation for the member of the family whose graph has a y intercept of -32

**math**

A school spent $1,802 on 6 new microscopes for science classes. Each microscope cost the same amount of money. Find the cost of 1 microscope. Show your work.

**Math**

Make a systematic list - PSM 81 - page 19 Carla and Nick were playing a factors game. Carla would name a factor of 48 and Nick would give the other factor. Make a table to show the different way Carla and Nick could play the 48 game. Please help. -- someone know what the book ...

**chemistry**

a metal object has a mass of 8.37g. when it was placed in a graduated cylinder containing 20.0ml of water, the water level rose to 23.1 ml. what is the density and identity of the metal?

**Art-plz check!!**

1. Mount Rushmore 2. a message of fear and power 3. use of an icon 4. Kente 5. haik 6. art movement 7. both b and c 8. romantic 9. scale drawing 10. atmospheric perspective

**statistics**

A false positive rate of 5% is considered to be a conservative estimate. Suppose that there are 20 employees in your company, which tests its workers weekly. What is the probability of no false-positives for this week’s test?

**english**

In the metaphor of language as a layer cake given in your study unit, which of the following words could be considered to be a frosting word?

**Math**

The sum of two numbers is 30. The first number is 1/5 the second number. What are the numbers

**science**

A ball weighing 1.78 N is shot through a launcher,achieving a speed (from rest) of 41 m/s in 0.28s. What is the mass of the ball.

**math**

Seven students took a quiz. Four of these students received a score above 85 percent. Students who received at least an 85 percent got a sticker. What percent of the students (rounded to the nearest full percentage number) received a sticker?

**math**

51.A sequence t is defined where the first term is –4. Each successive term is 3 more than the term before it. (a)Write an explicit formula for the sequence t. (b)A second function is defined as s(n) = 2 + 2n. Compare the rates of change of t(n) and s(n). (c)For what valu...

**Algebra 1B**

The polynomial given by 1.6t^ 2 - 28t + 200 calculates the heart rate, where t represents the elapsed time in minutes since exercise stopped. 1. What is the heart rate when the athlete first stops exercising? 2. What is the heart rate after 5 minutes? 3. Describe what happens ...

**chemistry**

thanks KS, 31 is A

**Ratio--math**

what is 14/J= 42/12

**Algebra 1B**

3x^²-12x+4 for x=-2 What are the exact steps when getting an answer?

**5th grade math**

Thanks

**5th grade math**

Is the correct answer 27?

**5th grade math**

To nearest whole number, what is 106.37 - 78.89? Can you show me please?

**5th grade math**

Rounded to the nearest tenth, what is the sum of 47.368 + 58.75?

**Math**

I'm having trouble with working a problem out and need to see how to solve. The question reads as follow: Mark has 24 baseball cards. He says that 8/24 are pitchers, 5/24 are catchers, and the rest are fielders. What fraction below represents the difference between the num...

**algebra**

Thank you, Jai!

**algebra**

For a motor vehicle travelling at r miles per hour, the distance d in feet required to stop at approximately d=0.05r^2+r. If a school bus is traveling at 45mph how many feet to, the nearest foot,would it travel before coming to a halt.

**math**

The probability of not picking a purple marble out of a bag of marbles is 2/5, if 2 purple marbles are taken out of the bag, reducing the number of purple marbles to 4, what will the new probability of picking a purple marble be?

**math**

The length of a rectangle is three times its width. If the area of the rectangle is 48, what is its length?

**poetry**

What mood best describes "Elegy Written in a Country Churchyard"?

**Math :)**

1.Try to solve this problem without using a formula. Suppose a disease is transmitted from an individual to one other during the period of a week. Each of those two gives the disease to two more people in the second week, so that the total of newly infected people is now four....

**statistics**

whether it is one-tailed or two tailed? and if one tailed...I do agree with you now that this is the left tail test. However I am not sure how to handle negative value on t. Here is what I did. I used formula for hypothesis test with mu unknow, t=(xbar-mu)/(sd/sqr n)=(26-25.02...

**statistics**

what test are you using? This is very confusing!

**statistics**

Ala rge fleet of cars is maintained with an average of 26 mpg. 50 recent trips displayed a mean of 25.02 mpg and standard deviation of 4.1 mpg. At the 5% level of significance, is their evidence the company has failed to keep their fuel goals? I did the math and got .03380315....

**Statistics**

Thank you, I got the same answer, but I thought that because the sample size was less than 30, there was something I missed.

**Statistics**

Hello, my problem is I have a random sample of only 15 sales average is $115 with a known population standard deviation of $25.00. Obtain a 92% confidence interval and explain what your answer means. I am not sure what to do because the sample size is only 15. Thanks for your ...

**Finance**

Buy a stock for $35 a share, hold it for 3 years, and then sell it for $75 a share (the stock pays annual dividends of $2 a share).

**Math **

1. Jill has a bond with a face value of $1,000. The bond has a coupon rate of 6%. Find her current yield if the market price of the bond is $1,027. 2. Calculate the annual interest you receive on a $1000 Treasury bond with a current yield of 1.5% that is quoted at 98 points. I...

**chemisty**

When magnesium metal and an aqueous solution of hydrochloric acid combine, they produce an aqueous solution of magnesium chloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) MgCl2 (aq) + H2 (g), if 24.3 g of Mg and 75.0 g of HCl are allowed to react, calculate the...

**Math Help**

Wow it's a shame that I can't get help:(

**Math Help**

Does anyone know about this? This is really hard and I'm in lots of need:)

**Math Help**

This homework question was removed due to a copyright claim submitted by the National Network of Digital Schools Management Foundation (NNDS). Please answer this ASAP! Thank you so much whoever answers! :)

**physics**

a toy rocket is fired upward with a net force of 50N. Because of this force it accelerates at 25m/s^2. What is the mass of the rocket?

**Math**

1. You need $200,000 to retire in 10 years. You can invest monthly amounts at 5% APR at work. How much should you contribute each month? 2. A friend creates an IRA with an APR of 6.25%. She starts at age 25 and deposits $50 per month. a) How much will her IRA contain when she ...

**Calculus**

A ladder 15 feet long leans against a vertical wall. Supppose that when the bottom of the ladder is x feet from the wall, the bottom is being pushed towards the wall at the rate of 1/2x feet per second. How fast is the top of the ladder rising at the moment the top is 5 feet f...

**MATH MATH MATH**

Mortgage lenders base the mortgage interest rate they offer you on your credit rating. This makes it financially critical to maintain a credit score of 700 or higher. How much more interest would you pay on a $195,000 home if you put 20% down and financed the remaining with a ...

**Physics**

Identical twins, each with mass 51.0 kg, are on ice skates and at rest on a frozen lake, which may be taken as frictionless. Twin A is carrying a backpack of mass 12.0 kg. She throws it horizontally at 3.00 m/s to Twin B. Neglecting any gravity effects, what are the subsequent...

**Physics**

Identical twins, each with mass 51.0 kg, are on ice skates and at rest on a frozen lake, which may be taken as frictionless. Twin A is carrying a backpack of mass 12.0 kg. She throws it horizontally at 3.00 m/s to Twin B. Neglecting any gravity effects, what are the subsequent...

**Math**

Assume that the mean salary for a profession is $35,104 with a standard deviation of $3200. What percent of the profession earns less than $38,700? I dont understand how to do this. Please help!!

**Math**

Given 15 data items: 11, 15, 13, 16, 8, 8, 9, 10, 11, 4, 9, 6, 8, 3, 17 Calculate the: range variance standard deviation first quartile second quartile (median) third quartile My answers are: 1. Range :14 2. Variance: 15.7 3. 3.96 4. 8 5. 9 6. 13 I just want someone to check m...

**Math**

Find the mean, median, and mode of the following: 11, 15, 13, 16, 8, 8, 9, 10, 11, 4, 9, 6, 8, 3, 17 I got.. Median=9 , Mode= 8 I am confused about the mean I got 9.8666666 ...Do I need to round this to 9.8 or 9.9 or 10 ?? Thanks for the help

**Statistics**

True 1. CORRELATION Correlation means that two variables (sets of data) have some type of association with each other, such that as one variable increases, the other also increases (a positive correlation), or decreases (a negative correlation).

**Health**

Reduces stress,lowers blood pressure

**Math**

4(7-y)= (4 x 3k) + (4 x 4)= 6(2 + 4x)= (5 x a) + (5 x 2)=

**Math**

Write an expression for the word phrase. r divided by 2

**math**

If I am in a canoe race and my friend is a half mile ahead of me, if I paddle at 3.4 miles per hour and he paddles at 3miles per hour, when will i catch him?

**French**

The word is nusiditaco and I need it unscrambled

**english**

b for quesstion#7

**algebra**

can some one tell me the simplified cube radical form of (64x^3y^7)^1/3

**math**

Round 9.46531 to nearest hundredth.

**Business Statistics**

Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits. Calculate the mean of the 20 samples Draw a histogram showing the 2...

**math**

Round 9.46531 to nearest hundredth.

**math**

what is m4 (m to the 4th power)

**poetry**

I need help with the last question for this as well. Also i am confused about the mood and tone of the poem. I thought that the tone was calm and passive can the mood be the same thing?

**Math**

A customer needs 88 ,2 inch pipe connectors to Complete a project. How many Bags of connectors would you recommend the customer purchase if each bag includes 25 connectors

**Math**

A customer needs 88 ,2 inch pipe connectors to Complete a project. How many Bags of connectors would you recommend the customer purchase if each bag includes 25 connectors

**chemistry**

Identify the neutral element represented by this excited-state electron configuration, then write the ground-state electron configuration for that element. Excited State: 1s2 2s2 2p2 3s1 Element Symbol: ? Ground State: ?

**Chemistry**

Some bacteria get their energy from reduction of CO2 to CH4 by H2. 1. How many electrons are required to reduce CO2 to CH4? 2. Calculate the G for formation of methane based on the two standard reduction potential of -0.171V for reduction of CO2 to CH4 and -0.414V for reductio...

**EDU 490 Interdisciplinary Capstone**

Shelby teaches 9th grade Social Studies at a small high school in the rural plains of Kansas. Most of her students are farm kids who will end up working their parents’ farms for the duration of their time in Kansas. In order to make use of the abundant knowledge related t...

**psy202**

SO I THINK IT WOULD BE A

**psy202**

i thing it is b

**psy202**

which of the following do experts recommend regarding the search for information on the internet avoid boolean operators since new technology has made them obsolete stick to one search engine like google so that bookmarks are better organized bookmark any site that has possibl...

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