Saturday
December 20, 2014

Posts by mark


Total # Posts: 1,274

calculus 2
f(x) = { 2 if x ! [0, 1) −1 if x = 1 3 if x ! (1, 2] −5 if x ! (2, 3) 20 if x = 3 } Prove that the function is Riemann integrable over [0, 4] and calculate its Riemann integral over [0, 4].
May 27, 2009

financial management
Callaghan Motors' bonds have 25 years remaining to maturity. Interest is paid annually, they have a $1,000 par value, the coupon interest rate is 12%, and the yield to maturity is 5%. What is the bond's current market price? Round your answer to the nearest cent.
May 27, 2009

Math, easy Q
Sorry, really messed up the wording
May 10, 2009

Math, easy Q
Does /-- ( Radical 7/10 ) = / 7 /-- ( Radical 70 over / - \/ 70 10 ) \ / 10 __ 10
May 10, 2009

help please
calculate A, B in this equation: 1000 A B sigma ai =( sigma ai) - (sigma ai) i=60 i=60 i=2
May 6, 2009

spanish
they asked you at what age she got married= caso
May 6, 2009

calc 2
Calculate A, B in the following equation: 1000 A B Ó ai = Ó ai - Ó ai I=60 i=2 i=2
May 6, 2009

codes and ciphers
i am trying to find the code example on the page:C=E D=G I=S K=C V=L Y=F
April 26, 2009

codes and ciphers
what is the type of cipher or code used on edhelper work sheets?
April 26, 2009

science
oh okay thank you
April 25, 2009

science
Stars by Cindy Grigg
April 25, 2009

science
but i dont have the complete story to finish it!
April 25, 2009

science
does anybody have an edhelper account i can use for my home work?
April 25, 2009

calculus
find the area of the region inside the circle r = 3sin(teta) and outside the cardioid r = 1 + sin(teta)
April 17, 2009

Help calculus 2
find the area of the region inside the circle r = 3sinè and outside the cardioid r = 1 + sinè
April 17, 2009

math
Determine whether the graphs of lines with the given Equations are Parallel, Perpendicular or neither. Eq#1 2X + 3Y = 4 and Eq#2 Y = - 2/3 X + 8
April 16, 2009

math
dont every curse at me again
April 14, 2009

math
I have to find the rule of each line can you help? 1.3,3.3,4.5,6.5,7.7,____,_____,_____ Rule:_______________________ 14.8,15,13.2,13.4,11.6,____,____,____ Rule:_______________________ 4.8,9.6,8.9,17.8,17.1,_____,______,_____ Rule:_______________________
April 14, 2009

Microeconomics
heya
April 5, 2009

8th Grade Science
At what temperature is water the most dense?
April 1, 2009

8th Grade Science
If we say that gold has a density of 19.32 g/ml, at what temperature is this substance?
April 1, 2009

French
Could you please check my answers thank you so much:) Use the verb pouvoir or vouloir Ah, je regrette, mais je ne ------- pas. À la télé, il y a ... Answer: Peux Si je comprends bien, tu ne ------ pas faire le dîner, parce que tu ------ regarder la t...
March 31, 2009

math
thx man
March 28, 2009

math
I know that (n+1)! = n!(n+1) but how would i solve the factorial: (2n+3)! thank you.
March 28, 2009

math
1296
March 19, 2009

math
what is the area of a square with a side of 36 in. ?
March 19, 2009

math
what is the formula for the area of a trapezoid? please include a diagram
March 19, 2009

algebra please help
how much of 12.5% of skylite red pigment needs to be mixed with 20% macintosh red pigment to get a 17% red pigment?
March 18, 2009

french
i need to unscramble these french words: chupket and mèrce. they are in the food catagory
March 17, 2009

math6
1/2, 3/8, 1/4, 0/2, 4/4, 7/8
March 10, 2009

need help math
Solve the problem. Roberto invested some money at 7%, and then invested $2000 more than twice this amount at 11%. His total annual income from the two investments was $3990. How much was invested at 11%?
March 8, 2009

algebra interest word problem
Solve the problem. Roberto invested some money at 7%, and then invested $2000 more than twice this amount at 11%. His total annual income from the two investments was $3990. How much was invested at 11%?
March 8, 2009

algebra
Solve the problem. Anne and Nancy use a metal alloy that is 24.9% copper to make jewelry. How many ounces of a 20% alloy must be mixed with a 27% alloy to form 100 ounces of the desired alloy?
March 8, 2009

algebra time and distance
Karin biked at 13 mph for a time but got a flat tire. She then walked at 5 mph. She traveled a total of 93 miles. Had she biked the whole time, she would have gone 117 miles. How many hours did she walk?
March 8, 2009

algebra
Marty leaves the airport in his private plane and flies due east at 186 mph. Two hours later, a jet leaves the same airport and flies due east at 434 mph. When will the jet overtake Marty's plane?
March 8, 2009

algebra
Solve the problem. Helen Weller invested $15,000 in an account that pays 12% simple interest. How much additional money must be invested in an account that pays 15% simple interest so that the total interest is equal to the interest on the two investments at the rate of 13%?
March 8, 2009

college algebra
the tests improve by 3 points, therefore: test 1 x test 2 x+3 test 3 x+6 test 4 x+9 the mean is the sum of the test scores divided by the number of tests. also, we know the mean = 69.5% therefore, we get the equation: (4x+18)/4 = 69.5% 4x+18 = 278 4x = 260 x = 65 therefore the...
March 8, 2009

Another astronomy (algebra-based physics) question
I’d prefer thorough solutions, but if you can only provide formulas that would solve each part of the problem, that’d be helpful too :-) Thanks! Spinning too fast The rate of rotation of astrophysical objects that are held together by gravity (e.g., stars or planets...
March 4, 2009

Astronomy (algebra-based physics)
Extrasolar planets There are currently 340 known extrasolar planets, i.e., planets around other suns. Most of them we infer only by their gravitational pull on their host stars, and a handful appear to dim the light of their host star as they transit in front of the star. In ...
March 4, 2009

Astronomy/Physics
I'd love thorough solutions to these problems, but simply providing the specific formulas that I should solve each part of the problem with would be really good too. :-) Thanks! Human energetics You are sitting down to study in the library. Let’s find out what limits ...
March 4, 2009

Physics - solar power in space
Hi, this requires some basic knowledge of astrophysics. I missed last lecture that covered this, so though I'd prefer thorough solutions to these problems, I'd appreciate it even if you could tell me which formulas to use to solve each part of the problem. Thanks! NASA...
March 4, 2009

Math
That's exactly why I said "quite" before I said "a few." Thanks for your help.
March 3, 2009

Math
I've got quite a few problems. Please answer any of them in whole or in part. Thank you in advance. (For the record, you're not doing my homework; you're helping me understand it. These problems were not assigned.) (1). Determine the discontinuities and whether or ...
March 3, 2009

Math: Probability
I need help. Here's the queston. Julia has 3 red marbles, 4 blues,3 yellow and 6 black in a bag. She takes one out at random. The probability its black ___ The probability its yellow ___ The probability it isnt red ___
February 28, 2009

Math
I am trying to find the percentages of different numbers. How do i find them? for example 83%of 6
February 27, 2009

social studies
I need to know about confidentiality of a person living with H.I.V.I would like to know if u know a person that is living with this virus can u tell others about this person.Is their any law that prohibits me of this
February 26, 2009

algebra d=rt word problem
Ahh, I kept reading the problem wrong and thinking it said 1/2 the time rather than a 1/2 hour less time so I was setting up the problem with 36(t/2) instead of 36(t-1/2). Thanks for your help!
February 26, 2009

algebra d=rt word problem
A car travels from one town to another at a speed of 32 mph. If it had gone 4 mph faster, it could have made the trip in 1/2 hour less time. How far apart are the towns.
February 26, 2009

math algebra
OOOH! I see, thanks for the help!
February 26, 2009

Science
Kelp
February 4, 2009

Science
Choose the plants from the following list that you would find in the lower shore area of the rocky shore. Kelp Lichens Irish moss Rockweed
February 4, 2009

Spelling
Thanks guys
February 3, 2009

Spelling
galactose is a monosaccharide commonly occurring in lactose.
February 3, 2009

Spelling
can anybody think of a sentence with galactose?
February 3, 2009

Math
thanks
January 25, 2009

Math
How many m^3 is 4.6cm^3 ? How do I start solving this
January 25, 2009

Chem
I am having problems with these two questions. 1.The value of the equilibrium constant (Kp) as represented by the first chemical equation is 1.58 x 102 at 727 °C. Calculate the value of the equilibrium constant (Kp) for the second equation at the same temperature. Express ...
January 22, 2009

computers
I have this problem with my PC The sound won't function properly. I've checked the volume controls and audio properties, etc, but they seem to be working fine. It's just that the sound won't come out. I've also tried installing a new set of speakers, yet ...
January 20, 2009

Chem
There are three questions in particular that I am having problems with. Here they are 1. A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard ...
January 19, 2009

French 1
Can you tell me how to say grandparents,granddaughter,and grandson in french thanks
January 8, 2009

9th grade science
Yes I'm taking about carbs, lipids, and protein could you tell me which three are oranic I have answers could you check them? My answer is eggs but I know there has to be more than that
January 8, 2009

math
thanks dude you rock
January 3, 2009

math
Im doing my homework and it provides barely any info. here is the question. Mr Harrison has a very large backyard. He contacted the Clover Pool Company to have a pool installed in the shape of a rectangle. The Clover Pool Company would build a pool that has a perimeter of 72 ...
January 3, 2009

math
it was accidentally sent dude -_-
January 3, 2009

math
Im doing my homework and it provides barely any info. here is the question.
January 3, 2009

math
Simplify: i^25 Sqrt-900 cuberoot-125x^6
January 1, 2009

Math
When seven times a number is added to the square of the number the result is 18. Find the number.
January 1, 2009

3rd grade Shurley english
How would you clasify Ouch! that bee sting hurts!
December 28, 2008

phy
A scaffold of mass 50 kg and length 7.0 m is supported in a horizontal position by a vertical cable at each end. A window washer of mass 80 kg stands at a point 1.5 m from one end. (a) What is the tension in the cable closer to the painter? N (b) What is the tension in the ...
December 13, 2008

English-PLEASE HELP!!!
PLEASE HELP!!!
December 10, 2008

English
The phrase, "The rogues ran rapidly around,” is a good example of 1.alliteration. 2.assonance. 3.onomatopoeia. 4.personification. I believe the answer is between alliteration and assonance.
December 10, 2008

math
x = (y - b)/m
December 10, 2008

math
b = (2A)/(xh)
December 10, 2008

math
yes. it passes the vertical line test AND the horizonal line test.
December 10, 2008

history
were there other times when the US used the atomic bomb, other than ww2?
December 10, 2008

history
was the US trying to intimidate the uSSR by displaying the power of the atom bomb? why? are there any supporting documents?
December 10, 2008

calculus
find dy/dx of sqrt(x+y)+sqrt(xy)=6
December 8, 2008

Social Studies (specifically American Goverment)
What could be some future challenges for freedom of religion in the 1st amendment?
December 6, 2008

calculus
at a given instant the legs of a right triangle are 5cm and 12 cm long. if the short leg is increasing at the rate of 1cm/sec and the long leg is decreasing at the rate of 2cm/sce, how fast is the area changing
December 4, 2008

Physics
What are some possible uses for gelled methanol and why was it never used as a fuel in transportation?
December 4, 2008

Chemistry
Calculate the work involved if a reaction with an enthalpy change of -2418 kJ is carried out in a vessel with a mobile, frictionless piston. Other details: the reaction is H2(g) + 1/2Oxygen2(g) yields H2O(g) with enthalpy change of -241.8 kJ/mol. The product is 180.16gH2O=10....
November 23, 2008

physics
Answer: 39.32746882 meters. How: KE = 1/2massxvelocity^2 = massxheightxaccelerationofGravity. Your velocity is 100km/h = 27.777..., so: 1/2(27.777...)^2 x mass = (385.8024691 m^2/s^2)xmass. (385.8024691m^2/s^2)m = mh(9.81m/s^2). Mass and all units except meters cancel when you...
November 22, 2008

Chemistry
Calculate the work involved if a reaction with an enthalpy change of -2418 kJ is carried out in a vessel with a mobile, frictionless piston. Other details: the reaction is H2(g) + 1/2Oxygen2(g) yields H2O(g) with enthalpy change of -241.8 kJ/mol. The product is 180.16gH2O=10....
November 22, 2008

physics
A Calorie with a capital C is 1 kilocalorie. 1c=4.184 J, so 1kc=4,184 J. 235 C X 4,184 J = 983,240 J. 1 W is 1 J/second. Divide 983,240 J by 74 J/s, to get 13287.02703 seconds. Divide that by 3600 seconds/hour to convert to hours. Answer in short: 13287.02703 s = 3.690840841 ...
November 22, 2008

8th Grade
your moms
November 20, 2008

math
In triangle ABC, line AB is congruent to line BC. If m angle A is 45, find m angle B.
November 17, 2008

math
In triangle ABC, angle C is congruent to angle A, line BC=2x-5, line AB=x+5 and line AC=x+10. Find x. The problem didn't have a triangle drawn so i drew it myself. I tried many equations but when i substitute it it didn't work.
November 16, 2008

chemistry
DATA Empty Evaporating dish and watch glass: 33.6g Evaporating dish, watch glass and NaHCO3: 35.08g Evaporating dish, watch glass and product: 34.65 NaHCO3(s) + HCL (aq) ----> NaCl(s) + H2O(L) + CO2(g) 1. Determine the mass if the sodium bicarbonate reacted? 2. Calculate ...
November 13, 2008

chemistry
My answers are 6 and 5 respectively. I'm confident that they're correct, but thanks for your time.
November 9, 2008

chemistry
Sorry, you're right. It is the lowest for the second.
November 9, 2008

chemistry
Atomic hydrogen produces well-known series of spectral lines in several regions of the electromagnetic spectrum. Each series fits the Rydberg equation with its own particular n sub 1 value. Calculate the value of n sub 1 (by trial and error if necessary) that would produce a ...
November 9, 2008

calculus
find the derivative of the function g(x) = (1 + 3x)^6(5 + x - x2)^8
November 7, 2008

social studies
Name Missouri's second largest city which also has French roots
November 5, 2008

Finite Math
Find the value(s) of the function, subject to the system of inequalities. Find the maximum and minimum of P = 10x - 16y subject to: 0 ¡Ü x ¡Ü 5, 0 ¡Ü y ¡Ü 8, 4x + 5y ¡Ü 30, and 4x + 3y ¡Ü 20 50, 0 -96, 0 -67.5...
November 4, 2008

g
doubling time is the time it takes for a country's population to double in number
November 3, 2008

g
Why is doubling time so low in African countries?
November 3, 2008

Books
I am writing a novel, i estimate i will finish pretty soon, within a year or two: I am an Amateur writer- how do i go about trying to publish this book?
October 30, 2008

math
Simplify. 10 lb 30 oz
October 27, 2008

Math
Complete the statement, using a metric unit of weight. A television weighs 30______.
October 27, 2008

math
Box A has 3 red marbles and2 yellow marbles. Box B has 2 red marbles and 1 yellow marble. If you have to pick a re marble to win a prize and you can not look in the box, which box would give you the best chance of winning the prize?
October 22, 2008

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