Friday

September 4, 2015
Total # Posts: 66

**Trigonometry**

An airplane is sighted at the same time by two ground observers who are 2 miles apart and both directly west of the airplane. They report the angles of elevation as 11˚ and 20˚. How high is the airplane? Round to the nearest hundredth of a mile.
*August 5, 2015*

**Bio/CHEM**

11. You need to make a 1:8 ratio of DNA of two DNA types A and B (A:B). Your total aliquot should be 2ng/26 ìL. For each of the following sets, calculate how much of each extract you should use and how much TE-4: a. Extract A: 2.5 ng/20 ìL, Extract B: 252.3 pg/&...
*May 24, 2013*

**Biology dilutions**

This is the homework exercise: You want to add 0.13 ul of DNA to 4.87 ul of extraction mix to have a final total of 5.0 ul of sample. But you don't want to make 0.13 aliquots because it is too small. Make a dilution to accomodate for the small aliquot. Any help would be ...
*March 28, 2013*

**Biology (dilutions)**

This is the homework exercise: You want to add 0.13 ul of DNA to 4.87 ul of extraction mix to have a final total of 5.0 ul of sample. But you don't want to make 0.13 aliquots because it is too small. Make a dilution to accomodate for the small aliquot. Any help would be ...
*March 27, 2013*

**math**

write 1 2/3 as a fraction?plezzzzzzzzz hellllllllllllllllllllllllllp!!!!!!!!!!!!!!!!!!!
*January 16, 2013*

**math**

Simplify each of the following exactly: (8^(-1000) sqr2^10000)/16^500 log_(8) 2
*October 27, 2012*

**math**

jhgjdykduykd
*August 20, 2012*

**calculus**

Antiderivative problem! Given f'(x)=3cosx–11sinx and f(0)=–2,find f(x)=
*June 6, 2012*

**calculus**

Gravel is being dumped from a conveyor belt at a rate of 50 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always the same. How fast is the height of the pile increasing when the pile is 24 feet high? Recall that...
*May 14, 2012*

**calculus**

At noon, ship A is 30 nautical miles due west of ship B. Ship A is sailing west at 25 knots and ship B is sailing north at 25 knots. How fast (in knots) is the distance between the ships changing at 6 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.)
*May 14, 2012*

**calculus**

A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.2 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 8 cm. (Note the answer is a positive number).
*May 14, 2012*

**calculus**

The altitude of a triangle is increasing at a rate of 3.000 centimeters/minute while the area of the triangle is increasing at a rate of 2.500 square centimeters/minute. At what rate is the base of the triangle changing when the altitude is 9.000 centimeters and the area is 93...
*May 14, 2012*

**Maths**

how would you factorise this: (p+q)^2+5(p+q) to get this answer:(p+q)(p+q+5)
*April 11, 2012*

**Statistics**

Hi, Ive looked online and in my textbook but I cant a good explanation. Basically, I need a detailed explanation of why quartile deviation is very effective?
*March 14, 2012*

**Hostory / Social Studies**

How Was Big Business Affected By War Mobilization ?
*March 12, 2012*

**Social Studies / History**

What Segments Of U.S Society Were Affected By The Institution Of Selective Service System ?
*March 11, 2012*

**Math - HELP !**

there are 50 students in the seventh grade , 62 percent of these students are involved in the drama club.how many seventh grade students are in the drama club ?
*March 10, 2012*

**English Law**

I meant to also say what they in terms of the UK law
*March 6, 2012*

**English Law**

what is an arbitration clause? What is a cancellation clause? What is a prevailing law clause? What is a complaints procedure?
*March 6, 2012*

**Accounting**

Do you include opening stock in the profit and loss account?
*February 17, 2012*

**History**

Why Was It Possible For One Event To Cause A War Among So Many Countries ? (Cite Specific Evidence).
*February 5, 2012*

**Advanced Biochemistry**

ok thank you!
*January 27, 2012*

**Advanced Biochemistry**

Cryotosporidium pervum sporozoites are prolate spheres approximately 4 um long and 1 um wide. The average density of the cell is 1.28 g/mL. Approximately 7% of the wet weight of the organism is soluble protein. Estimate the number of molecules of a particular enzyme per cell ...
*January 27, 2012*

**Chemistry help!!**

Consider the titration of the weak acid HA with NaOH. At what fraction of Ve does pH = pKa - 1? At what fraction of Ve does pH = pKa + 1? Calculate the pH at these two points plus Vb = 0, 1/2Ve, Ve and 1.2Ve, if 100 mL of 0.100 M anilinium bromide (pKa = 4.601) is titrated ...
*November 29, 2011*

**Analytical chemistry help!**

Great I think I can figure the rest out! Thank you for your help!
*November 26, 2011*

**Analytical chemistry help!**

I converted every thing to mols instead of milli mols so for the first part got pH=9.208 + log(1-(4.20/11.42)/(4.20/11.42) so my pH= 9.44 when 4.20 mL of 0.438 M HClO4 is added?
*November 26, 2011*

**Analytical chemistry help!**

Calculate the pH of a solution made by mixing 50.00 mL of 0.100 M NaCN (Ka of HCN = 6.2 x 10-10) with a) 4.20 mL of 0.438 M HClO4 and b) 11.82 mL of 0.438 M HClO4. What is the pH at the equivalence point with 0.438 M HClO4?
*November 26, 2011*

**Analytical Chemistry 2**

Ve is volume at equivalence point Vb is volume of base
*November 26, 2011*

**Analytical Chemistry 2**

Consider the titration of the weak acid HA with NaOH. At what fraction of Ve does pH = pKa - 1? At what fraction of Ve does pH = pKa + 1? Calculate the pH at these two points plus Vb = 0, 1/2Ve, Ve and 1.2Ve, if 100 mL of 0.100 M anilinium bromide (pKa = 4.601) is titrated ...
*November 26, 2011*

**Analytical Chemistry**

Consider the titration of 100.0 mL 0.1 M KOH with 1.0 M HBr. Find the pH at the following volumes of acid (Va) added: Va= 0, 1, 10 and 10.1 mL.
*November 26, 2011*

**Maths**

A Swiss Roll cake is 21cm long. When I cut it onto slices if I reduce the thickness of each slice by 1/4cm. Taking x as the number of thicker slices, write down an equation in x and solve. I just dont undertsand how to form the question.
*January 10, 2011*

**Economics**

Suggest three reasons why there is a market for expensive imported alcoholic drinks in countries such as Thailand, South Korea or India when there are locally produced substitues sold at a fraction of the price.
*November 1, 2010*

**Maths Urgent**

I have worked out the gradient funtion. If dy/dx = 8x - 3x^2 , then how you show that dy/dx is postive when 0<x<8/3
*October 18, 2010*

**Maths**

If dy/dx = 8x - 3x^2 , then how you show that dy/dx is postive when 0<x<8/3
*October 18, 2010*

**Science**

A bus makes a 10 mile journey throuh town. Its top speed is 30mph and its mean speed its 10 mph. Explain why these speeds are different?
*September 21, 2010*

**Maths**

What roots can I use to sketch this graph of: y = x^4 - x^2
*March 3, 2010*

**Business Studies**

Why do businesses need to raise finance?
*December 30, 2009*

**Business Studies URGENT**

What are some of the factors that can lower the risk in starting up a business?
*December 29, 2009*

**Buiness Studies URGENT**

What are some high-risk factors of starting a business?
*December 28, 2009*

**earth**

What is the difference between a resource and a condition
*November 10, 2009*

**economics**

apples cost £2 and pears cost £4. For John the marginal Utility (MU) of the last apple consumed was 4 and MU of pears was 12. For Paul MU of last apple was 3 and MU of last pear was 6. Which person is not maximising utility and how can you tell? What should they do?
*November 8, 2009*

**Maths**

A cubic graph has the equation: y = 3(x-1)(x+2)(x+5) Write in similar form the equation of the graph after a translation ( 3) Could you show me step-by step please?
*October 1, 2009*

**math**

I am pretty sure that this is how you do it: There are 26 letters in the alphabet so if there are five vowels then it would be 5/26 in the word segments 7 letters are used so you dont count the second s so it would be 7/26
*September 24, 2009*

**Maths**

2y^2 - 8y - 8 = 0
*September 20, 2009*

**Maths**

Thankyou
*September 20, 2009*

**Maths**

When the first n positive integers are added together, their sum is given by 1/2n(n+1) Find the value of n for which the sum is 105.. Can you show me a step by step please?
*September 20, 2009*

**Maths**

wHAT IS AN INTEGER?
*September 20, 2009*

**Maths**

What is an integer?
*September 20, 2009*

**Maths**

Find the equation of a line which is perpendicular to 2x + 3y = 4 passing through ( -5, 1) Can you show mw how to work this out step by step please?
*September 20, 2009*

**Maths**

I know but can you just tell me if this is correct: a = 1 b = 8 c= 5 x= -8 + square root 8^2 - (4x1x5) - -------------- 2
*September 17, 2009*

**Maths**

I know but can you just tell me if this is correct: a = 1 b = 8 c= 5 x= -8 + square root 8^2 - (4x1x5) - -------------- 2
*September 17, 2009*

**Maths**

I have already asked this question but I have to use my calculator to solve x^2 + 8x + 5 = 0 Someone gave me a link to a quadratic formula solver but when I enter it into my calculator I nvever get the right answer.
*September 17, 2009*

**Maths**

Thanks but when I enter it on my calculator I never get the right answer.
*September 17, 2009*

**Maths**

Use your calculator to solve x squared + 8x + 5 = 0
*September 17, 2009*

**Asap can someone pplz check these answers**

Please check my answers I have 2 do other things right now
*January 26, 2009*

**Poem: Beware do not read this poem by Ishmeal Reed**

Could someone please check these ASAP! 1. What story does the poem tell in the first three stanzas? Answer: The story that the poem is telling is a women who lived amoungst mirrors had locked herself in her house, and two villagers broke in, and she escaped into her mirror. ...
*January 26, 2009*

**Poem: A Voice by Pat Mora**

Could you please check my answers thanks 1.What happens when the mother goes to the state capitol to give her speech? Answer: When the mother goes to the state capitol to address her speech she wanted to hide her face. Also she faked hoarseness, and she felt her breath was ...
*January 26, 2009*

**7th grade**

Umbrella Under Universe Uranus
*January 26, 2009*

**Economics**

I need some help in this question, thanks. Suppose that a Home country has many trading partners and each trading partner has its own currency. (a) If each trading partner allows its currency to float, is it possible for Home to fix its exchange rate against all of its trading...
*May 20, 2008*

**Economics**

Correct me if I am wrong, if a country's currency appreciates, foreign goods are relatively cheaper than domestic goods, so imports increases and export decreases. And if depreciates, the opposite is true?
*May 19, 2008*

**english**

what is penelope hesitation toward odysseus?
*March 27, 2008*

**english**

What is penelope hesitation towards odysseus?
*March 27, 2008*

**Science**

What is Prothallium? What is it's Purpose. http://en.wikipedia.org/wiki/Prothallus
*July 10, 2007*

**math function rule input/output**

Rule add7 Then subtract 7 Input. Output 3. 8 7
*March 21, 2007*

**Economics**

What are the advantages and disadvantages of different trade barriers? Take a shot. What do you think? Hint: consider the question broadly, not just in terms of pure economic reasoning.
*September 27, 2006*

**Economics**

Why would the U.S. impose a voluntary export restraint on Japan for textiles instead of using a import quota or tariff? Why indeed. This is as much an international political question as a question in economics. Quota or tariffs tend to apply to all nations rather than a ...
*September 27, 2006*

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