Sunday
February 26, 2017

Posts by dEE

Total # Posts: 926

college Algebra
Write the system as a matrix and solve it by Gauss-Jordan elimination. (If the system is inconsistent, enter INCONSISTENT. If the system has infinitely many solutions, show a general solution in terms of x, y, or z.) x + 2y − z = 5 2x − y + z = 2 3x − 4y + 3z...
December 15, 2013

college Algebra
Use matrix methods to solve the problem. To use space effectively, librarians like to fill shelves completely. One 105-inch shelf can hold 3 dictionaries, 5 atlases, and 1 thesaurus; or 6 dictionaries and 2 thesauruses; or 2 dictionaries, 4 atlases, and 3 thesauruses. How wide...
December 13, 2013

college Algebra
thank you
December 13, 2013

college Algebra
Use matrix methods to solve the problem. 120,000 gallons of fuel are to be divided between two airlines. Triple A Airways requires three times as much as Unity Air. How much fuel should be allocated to Triple A? ______ gal
December 13, 2013

college Algebra
i have no clue why its not working... i tried: 0,0,0 9,9,9 INCONSISTENT
December 13, 2013

college Algebra
its saying its wrong? :/
December 13, 2013

college Algebra
i think you used the wrong one for the third line... x+z=18 y+z=18 x-z=0
December 13, 2013

college Algebra
the answer didn't work...
December 13, 2013

college Algebra
Solve the system, if possible. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter a general solution in terms of x, y, or z.) x + y = 18 y + z = 18 x − z = 0
December 13, 2013

college Algebra
Solve the system, if possible. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter a general solution in terms of x, y, or z.) x + y + z = 7 2x + y + z = 14 x + 2y + 3z = 2
December 13, 2013

College Algebra
thank you, big help
December 12, 2013

College Algebra
Use a system of equations to solve the problem. A rectangular picture frame has a perimeter of 2,200 centimeters and a width that is 300 centimeters less than its length. Find the area of the picture. _____ cm2
December 12, 2013

math
12-4=8 8-4=4 4-4=0
December 5, 2013

Physics
A 0.125 kg meter stick is rotating (as shown to the right) in a horizontal plane about an axis through its center at 3.45 rad/s. a) Find the rotational inertia of this stick. At one of its ends, find its b) speed and c) centripetal acceleration. If this stick comes to rest in ...
December 2, 2013

Algebra
Thanks, Steve. I was having a mental block on this one and knew it was easy! I appreciate your help.
November 26, 2013

Algebra
This homework question was removed due to a copyright claim submitted by the National Network of Digital Schools Management Foundation (NNDS).
November 26, 2013

algebra 1
Each of the values in your table shows an x value and a corresponding y value. So, your ordered pairs are: {(4,3), (2,5), (2,2), (3,5), (1,1)} Graph them. The domain is {1,2,3,4} or the x values in numerical order and not listed more than once. The range is {1,2,3,5} or the y ...
November 26, 2013

algebra
that's exactly what I got but it keeps saying it is wrong.
November 21, 2013

algebra
find all roots of the polynomial equation. x^5+3x^4-2x^3-14x^2-15x-5=0.
November 21, 2013

algebra
thank you soooo much!!!
November 21, 2013

algebra
a hot-air balloon is tethered to the ground and only moves up and down. You and a friend take a ride on the balloon for approximately 25 minutes. On this particular ride the velocity of the balloon, v(t) in feet per minute, as a function of time, t in minutes, is represented ...
November 21, 2013

algebra
Help me factor x^2 -2x - 4 = 0 and 3x^2 + x + 3 = 0.
November 18, 2013

college algebra
A partial solution set is given for the polynomial equation. Find the complete solution set. (Enter your answers as a comma-separated list.) x^3 + 3x^2 − 14x − 20 = 0; {−5}
November 18, 2013

college algebra
Use long division to perform the division. (Express your answer as quotient + remainder/divisor.) (x^4 + 7x^3 − 2x^2 + x − 1) / (x − 1)
November 18, 2013

college algebra
Solve the exponential equation using logarithms. Give the answer in decimal form, rounding to four decimal places. (Enter your answers as a comma-separated list.) 4^(x − 3) = 3^(2x) x = _____
November 18, 2013

college algebra
Use a calculator to help solve the problem. An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of the substance? (Round your answer to one decimal place.) ____hr
November 18, 2013

college algebra
not sure how to find the t, tried using the log approach but can't get the right answer.
November 17, 2013

college algebra
An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of the substance? (Round your answer to one decimal place.) ____hr
November 17, 2013

college algebra
no it looks more like this: 4^(x-3)=3^2x
November 17, 2013

college algebra
Solve the exponential equation using logarithms. Give the answer in decimal form, rounding to four decimal places. (Enter your answers as a comma-separated list.) 4x − 3 = 32x x = _____
November 17, 2013

college algebra
In 4 years, 30% of a radioactive element decays. Find its half-life. (Round your answer to one decimal place.) _____ yr
November 17, 2013

college algebra
thank you
November 4, 2013

college algebra
Use a calculator to find y to four decimal places, if possible. (If an answer is undefined, enter UNDEFINED.) ln y = log 9
November 4, 2013

college algebra
Use a calculator to find y to four decimal places, if possible. (If an answer is undefined, enter UNDEFINED.) ln y = −0.35
November 4, 2013

college Algebra
Use a calculator to find y to four decimal places, if possible. (If an answer is undefined, enter UNDEFINED.) ln y = −0.35
November 4, 2013

college Algebra
Use a calculator to find y to four decimal places, if possible. (If an answer is undefined, enter UNDEFINED.) ln y = log 9
November 4, 2013

college Algebra
Thank you, big help!
November 4, 2013

college Algebra
Use a calculator to help solve the problem. The life expectancy of white females can be estimated by using the function = 78.5(1.001)x, where x is the current age. Find the life expectancy of a white female who is currently 50 years old. Give the answer to the nearest tenth. L...
November 4, 2013

college algebra
i did that and it is not working. i get 0.0348
November 4, 2013

college algebra
Use a calculator to help solve the problem. The intensity I of light (in lumens) at a distance x meters below the surface is given by I = I0 k x, where I0 is the intensity at the surface and k depends on the clarity of the water. At one location in the Atlantic ...
November 4, 2013

College Algebra
thank you Reiny and Bob
November 4, 2013

College Algebra
Use a calculator to help solve the problem. One isotope of holmium, 162Ho, has a half life of 22 minutes. The half-life of a second isotope, 164Ho, is 37 minutes. Starting with a sample containing equal amounts, find the ratio of the amounts of 162Ho to 164Ho after two hours...
November 4, 2013

Finance
P5. A thirty U.S. Treasury bond has a 4.0 percent interest rate. In contrast, a ten-year Treasury bond has an interest rate of 2.5 percent. A maturity risk premium is estimated to be .2 percentage points for the longer maturity bond. Investors expect inflation to average 1.5 ...
November 2, 2013

Statistics Math
with the reliability coefficent of 0.81 using the classical theory we would interpret that the
October 28, 2013

College Algebra
I think the question is asking what she would pay at the end of the year. I tried $159.93 and it was not correct.
October 28, 2013

College Algebra
A bank credit card charges interest at the rate of 23% per year, compounded monthly. If a senior in college charges $1,700 to pay for college expenses, and intends to pay it in one year, what will she have to pay?
October 28, 2013

math
if a 50ft flag pole cast a 10ft shadow how far is it from the end of the shadow to the top of the pole
October 25, 2013

college algebra
graph the following: 7x + 6y = 42 (-6x+42)\(7)
October 24, 2013

college algebra
graph the following: (5/4)x-4 (4x+16)/(5)
October 24, 2013

college algebra
Thanks, I finally got it.
October 21, 2013

college algebra
now all I need help on is finding the domain of the f(f) that you just posted.
October 21, 2013

college algebra
no sir, it asks for f(f).
October 21, 2013

college algebra
thank you so much steve!! could you help me with this one? Let f(x) = square root (x + 2) and g(x) = x^2 − 2. Determine the domain of the composite function. (Enter your answer using interval notation.) f compose f _____? and Find the composite function. (f compose f)(x...
October 21, 2013

college algebra
find the domain of (x-2)/(-3x+7)
October 21, 2013

college algebra
Let f(x) = 1/x − 2 and g(x) = 1/x − 3 . Determine the domain of the composite function. (Enter your answer using interval notation.) g compose f _____? & Find the composite function. (g compose f)(x) = _____?
October 21, 2013

college algebra
Let f(x) = square root (x + 2) and g(x) = x^2 − 2. Determine the domain of the composite function. (Enter your answer using interval notation.) f compose f ______? & Find the composite function. (f compose f)(x) = _____?
October 21, 2013

college algebra
(Enter your answer using interval notation.) f compose f
October 21, 2013

college algebra
Let f(x) = x + 2 and g(x) = x2 − 2. Determine the domain of the composite function.
October 21, 2013

college algebra
Thank you so much.
October 21, 2013

college algebra
what is the domain of (square root of x) +7?
October 21, 2013

college algebra
Thank you Steve, that was a big help.
October 14, 2013

college algebra
the following rational function gives the number of days it would take two construction crews, working together, to frame a house that crew 1 (working alone)could complete in t days and crew 2 (working alone) could complete in t+3 days. f(t)=(t^2+3t)/(2t+3). (a) if crew 1 ...
October 14, 2013

college algebra
Need help in finding all vertical, horizontal, and slant asymptotes, x- and y-intercepts, and symmetries of f(x)=(x-3)/(x-4)
October 9, 2013

Chemistry
What is the relationship of the concentration of H3O and of OH
October 9, 2013

social studies
men from higher social classes in------ cultures tend to have low levels of conformity, more self-direction, and have greater intellectual flexibility than did men from lower social classes A) collectivist B) individualist C) interdependent D) all My choice is C but Im a ...
October 4, 2013

physics
a 100g mass of cookie dough hits inelastically with a 300g mass of cookie dough and they stick. the 100 g mass was moving to the right at 40 m/s and the 300g mas was moving to the left at 5 m/s. what is the final velocity of the massive cookie dough ball? what fraction of ...
October 3, 2013

social studies
thank you very much!
September 29, 2013

social studies
I am guessing this one, because I can't find the answer on my book. Would it be D.
September 29, 2013

social studies
people in countries with tend to be happier A) high incomes B) low incomes C) more civil liberties D) high incomes and more civil liberties My answer is B.
September 29, 2013

social studies
daydreaming can be an expression of: A) repression B) denial C) sublimation D) projection My answer is D
September 29, 2013

social studies
thank you for the eye opener:)
September 29, 2013

social studies
then the answer is B, because personality its not heritable and def. not C
September 29, 2013

social studies
all personality variables are: A) highly heritable B) unconscious C) theoretical constructs D) easily assessed with questionnaries My asnwer is D
September 29, 2013

aed
thank you
September 20, 2013

aed
I need an answer
September 20, 2013

aed
determine the potential impact of socioeconomic status on education in the following areas: teacher expectatations, student tracking, equal representation in the curriculum, and financial support for schools
September 20, 2013

math
a rectangular swimming pool 20 feet long and 10 feet wide,is enclosed by a wooden deck that is 3 feet wide. What is the area of the deck? How much fence is required to enclose the deck?
September 19, 2013

math
a rectangular swimming pool 20 feet long and 10 feet wide,is enclosed by a wooden deck that is 3 feet wide. What is the area of the deck? How much fence is required to enclose the deck?
September 19, 2013

Algebra
Express the relationship 20 < C < 30 in terms of F, where F = 9/5C + 32. _____________ < F < _____________
September 17, 2013

Algebra
the cost of renting a rototiller is $16.50 for the first hour and $10.95 for each additional hour. How long can a person have the rototiller if the cost must be less than $55.00?
September 17, 2013

algebra
a student write that an=3n+1 is a explicit formula for the sequence 1,4,7,10.explain the error and write the correct explicit formula for the sequence.
September 11, 2013

college algebra
The county news earns a profit of $20 per year for each of its 3000 subscribers. Management projects that the profit per subscriber would increase by $0.01 for each additional subscriber over the current 3,000. How many subscribers are needed to bring a total profit of $113,100?
September 10, 2013

college algebra
no, I copied the question just as it is, there is 2 answers, the $10,000 is the smaller amount he invested, there should also be a larger amount.
September 10, 2013

college algebra
Scott and Laura have both invested some money. Scott invested $2500 more than Laura and at a 3% higher interest rate. If Scott received $900 annual interest and Laura received $450, how much did Scott invest?
September 10, 2013

college algebra
a large rectangular movie screen in an IMAX theater has an area of 8624 square feet. Find the dimensions of the screen if it is 10 feet longer than it is wide.
September 8, 2013

CHEM
joules to melt a 525g ice cube at 0∘C and to warm the liquid
September 8, 2013

Algebra
Kevin stuffs shrimp in his job as a seafood chef. He can stuff 1200 shrimp in 4 hours. When his sister helps him, they can stuff 1200 shrimp in 3 hours. If kevin gets sick, how long will it take his sister to stuff 600 shrimp?
September 5, 2013

Algebra
Allison drove home at 68 mph but her brother who left at the same time could only drive at 54 mph. When Allison arived, her brother still had 84 miles to go. How far did Allison drive?
September 5, 2013

business
would it B be the best answer?
August 27, 2013

business
Select the statement which reflects the employer position on electric monitoring. a.) An employee's actions during work time are at the discretion of the Company. b.) Employees should be notified of any electronic monitoring and its purpose. c.)Electronic monitoring ...
August 27, 2013

business
A manager refuses to reveal company secrets despite an offer of handsome kickbacks. Which of the following reasons justifies her action if she were to subscribe to Kohlberg’s preconventional level of moral reasoning? A- An idea of the unpleasant emotions she would feel if...
August 27, 2013

Physics
a cylinder of gas is at a room temp (20 c) the air conditioner breaks down and the tempture rises to 58c what is the new pressure of the gas relative to its initial pressure?
July 30, 2013

maths
find a single discount equivalent to the discount series 20%, 10%, and 15%.
June 29, 2013

Stats
1. In a study of caffeine and stress, college students indicate how many cups of coffee they drink per day and their stress level on a scale of 1-10. The data appear below. Number of Cups of Coffee Stress Level 3 5 2 3 4 3 6 9 5 4 1 2 7 10 3 5 = 3.88 X= 5.13 s = 2.03 s = 2.90 ...
June 22, 2013

Eng
wrong
June 9, 2013

math
a rectangle has a length of 10 3/16 inches and a width of 6 7/8 inches. nwhat is the perimeter of the rectangle
May 29, 2013

algebra
Need help with 3 problems on page 167 X+2y=6 5x+3y=2 4x-3y=-20 -x-8y=5 5x+6y=-11 3x+y=-4
May 14, 2013

Geometry
A landowner digs a 15 meter deep well with a diameter of 2.8 meters. The landowner spreads the dirt dug out of the holds to form a flat platform 31.5 meters by 6 meters. What is the length of the platform?
May 1, 2013

Geometry
An unsharpened pencil is in the shape of a hexagonal prism, in which the face edge is 4 millimeters and the length is 170 millimeters. What is the lateral area of the pencil?
May 1, 2013

Chemistry
Use the data from this table of thermodynamic properties to calculate the maximum amount of work that can be obtained from the combustion of 1.00 moles of ethane, CH3CH3(g), at 25 °C and standard conditions. I absolutely have no idea what to do, please help me!
April 30, 2013

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