Monday
September 1, 2014

Posts by Mark


Total # Posts: 1,245

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

math
If you have a rectangle that is 8cm by 6cm and you cut it diagonally, what other 4 geometric shapes can you create
October 19, 2008

Physics
YOu are creating a transverse wave in a rope by shaking your hand from side to side. Without changing the distance that your hand moves, you begin to shake it slower and slower. What happens to the frequency? it decreases?? 2. For incomplete cancellation to occur, opposite ...
October 17, 2008

english
a place where goods are manufactured is called a what?
October 14, 2008

math
Teresa has 4 flower pots in 4 different designs. She likes to display her flower pots in different positions on her window sill. How many different ways can she place her flower pots? Do you 4x4=16 4x3=12 4x2=8 4x1=4 and then 16+12+8+4
October 10, 2008

MATH
I don't think that answer is right. 60 minutes in a hour 72x60= 4320 an hour 24 hours in a day 4320x24=103680 a day 103680x30 days=3110400 a month Then go back and do 103680 a day x365 days a year=37843200 37843200 a year x 72 year=2724710400 Let me know what you think and...
October 9, 2008

calc
Let C be the curve which is the intersection of the half-cone S1 = {(x,y,z)|z=sqrt(x^2 + y^2} and the paraboloid S2 = {(x,y,z)|2z=3-x^2-y^2}. Find C. a)Make a 3-D sketch to show S1, S2, and C b) Show that at each point on C the normals to these two surfaces are perpendicular ...
October 5, 2008

Calculus-partial derivatives
Let Z = f(u,v) where u=xy^3 + e^3 and v = (x^2)y. Obtain expressions for Zx and Zy in terms of fu and fv. I don't understand the "in terms of" part. How do I do this question? thank you
October 5, 2008

calculus
Let C be the curve which is the intersection of the half-cone S1 = {(x,y,z)|z=sqrt(x^2 + y^2} and the paraboloid S2 = {(x,y,z)|2z=3-x^2-y^2}. Find C. a)Make a 3-D sketch to show S1, S2, and C b) Show that at each point on C the normals to these two surfaces are perpendicular ...
October 5, 2008

geography - weather and climate
i need to draw a labelled diagram and explain why depressions bring cloud and rain. do you know any good sites that would help me and explain it simply for me to understand. thanks!
October 4, 2008

math
Mr.Jackson is preparing bags of treats to give trick or treaters on Halloween. He has 48 pieces of candy and 60 pieces of gum.He uses all the candy and gum, and he puts the same ratio of candy to gum in each bag. What is the largest number of bags he could have made.
October 1, 2008

calculus
Consider a plane curve which is described in polar coordinates (r, @) by r = g(@) for @ for all [a,b] (@ representing theta). Starting from the known expression for the length of a plane curve in Cartesian coordinates and the equation x = rcos@, y = rsin@, obtain an integral ...
September 22, 2008

Calculus
Consider a plane curve which is described in polar coordinates (r, @) by r = g(@) for @ for all [a,b] (@ representing theta). Starting from the known expression for the length of a plane curve in Cartesian coordinates and the equation x = rcos@, y = rsin@, obtain an integral ...
September 22, 2008

calculus
Consider a plane curve which is described in polar coordinates (r, @) by r = g(@) for @ for all [a,b] (@ representing theta). Starting from the known expression for the length of a plane curve in Cartesian coordinates and the equation x = rcos@, y = rsin@, obtain an integral ...
September 21, 2008

calculus
wow thx a lot man
September 20, 2008

calculus
the path of a particle in the xy-plane is vector r = (cos2t, sint) for t for all [-pi/2, pi] where t represents time. Sketch the path. Is it a smooth curve? How do i sketch the path? do i just plug in random points between [-pi/2, pi]? how would i connect it together? and how ...
September 20, 2008

Calculus
the path of a particle in the xy-plane is vector r = (cos2t, sint) for t for all [-pi/2, pi] where t represents time. Sketch the path. Is it a smooth curve? How do i sketch the path? do i just plug in random points between [-pi/2, pi]? how would i connect it together? and how ...
September 20, 2008

calculus
A particle traces the path vector r = (t^3, t+3, t^2 -4t) where t represents time; it flies off on a tangent when t=1 and then moves in a straight line with constant speed. Find its position when t=4. Do I just plug the 4 into the t's in vector r?
September 20, 2008

physiology
a d d
September 16, 2008

college
Find limit X approaches 1 for ((5-X)^.5 -2)/((2-X)^.5 -1) e-mail address: mark.hultgren@ca.usda.gov Thank you.
September 15, 2008

HELP!
WHY ARE GAS PRICES RISING?
September 6, 2008

Calculus
a) Prove that |A|^2 = A•A for every vector A. (Note, the A's are vectors) b)Use this to show that if |F(t)| is constant for t for all (a,b), then F'(t)•F(t) = 0 for t for all (a,b). (Note the Fs are vectors)
September 6, 2008

Algebra Help
1. You have recently found a location for your bakery and have begun implementing the first phases of your business plan. Your budget consists of an $80,000 loan from your family and a $38,250 small business loan. These loans must be repaid in full within 10 years. a) What ...
September 4, 2008

health
health concerns fron 1990 to 2010 for 9th grade heath class homework
September 4, 2008

Calculus I
This post was also placed at freemathhelp, on the calculus board with titled, "Calculus I". No work is shown at either location. Sad.
September 2, 2008

cultural diversity
Women are considered the social minority in the United States because they belong to this group, and are sometimes subject to prejudice and discrimination
August 28, 2008

Math
1.)Write the ratio of 20 to 18 in lowest terms 2.)Find the supplement of <A. m<A =72 degrees. 3.)Place the following numbers in ascending order. -2/5, 1/6, 7/8, -5/9, 3/4
August 18, 2008

Math
A=30?
August 18, 2008

accounting
a credit to the overhead account
August 12, 2008

Marketing
I am writting a marketing plan essay and need to describe sales support but I cannot find a clear definition to start from. Help?
July 31, 2008

Organization Behavior
Thank you
July 19, 2008

Organization Behavior
what is a customer base description?
July 19, 2008

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