Wednesday
November 26, 2014

Posts by matthew


Total # Posts: 578

math
Darion needs 20 pieces of string 3/8 inch in length .He cut a 4 7/8 inch piece of string into pieces that are 3/8 of a inch long each. How many more pieces of string does he need?
November 16, 2014

Operations with Fractions
Darion needs 20 pieces of string 3/8 inch in length. He cut a 4 7/8 inch piece of string into pieces that are 3/8 of an inch long each. How many more pieces of string of string does he need?
November 15, 2014

Is this correct
Anyone??
November 11, 2014

Is this correct
f(x)= 1/3x^5 + x^-2 + 3, then f'''(x) is.. I got f'''(x)= 20x^2-24x^-5
November 11, 2014

math
A florist had an equal number of red and yellow tulips. She sold 624 red tulips. Then she had 4 times as many yellow tulips as red tulips. How many tulips did she have at first. 624 X 5 ----- 3120
October 27, 2014

Physics
A 15 kg sled experiences an applied force of 5.5 N [north] and an opposing frictional force of 2.5 N [south]. If the sled starts from rest, what will be the velocity of the sled after 4.0 s?
October 26, 2014

Chemistry
What is the difference between Citric Acid C6H8O7 and H3C6H5O7? I am seeing both and don't know which is the right one. Is one a solution of citric acid? Thanks
September 29, 2014

algebra
18x+4y=-10 9x-7y=-23
September 4, 2014

math
Area of a rectangle = 221 m2; width = length = ? Should the answer be 13 or or 26
September 2, 2014

Physics
Two boys are pulling a box across a horizontal floor as shown in the figure below. vector F 1 = 50.0 N and vector F 2 = 100 N. (a) Find the resultant (or sum) force by the graphical method. (b) Find the resultant (or sum) force by the component method.
August 25, 2014

Trig
Use the given information to evaluate sin (a-b). Exact answers. No decimals. Sin a = -7/25, cot b = 8/15; neither a nor b are in quadrant III.
May 7, 2014

Math
How many roots does x to the 3rd power -2x to the 2nd power-13x-10=0 have
April 21, 2014

Chemistry
Doing some homework, are my answers right? HCN= Polar HCOOH= Polar H2CCCH2= Nonpolar Out of the following elements: Na, H, and Au order them least to greatest in the following: Eletronegativity= Na is smallest, H is second, Au is largest Ionization Energy= Na is smallest, Au ...
April 3, 2014

Science
Right Answers: True A B C C B C D
February 3, 2014

chemistry
A chemist needs a HCl solution with a molarity of less than 0.400 M for an experiment. To find out if a sample of HCl solution can be used in the lab, the chemist performs a titration to neutralize 59.2 mL of the HCl with 45 mL of 0.400 M NaOH. Based on the results, will the ...
January 31, 2014

Stats
A random sample of size 100 is drawn from a population with a standard deviation of 10. If only 5% of the time a sample mean greater than 20 is obtained, the mean of the population is ______.
December 13, 2013

Math
Thank you for the answer now I understand. For the next question I made a mistake this is the question elli has two 8 and 1/2 pound bags of mints. She plans to put 1/12 pound at each place setting. Will she have enough mints? She has 256 guests I think that means 256 place ...
December 11, 2013

math
Ellis plans to hand out door prizes as the guest arrive she has 256 guests every 6th guest will receive a mug and for every 14 guests will receive a t shirt. Which guest will be the first to receive both mug and at shirt? Next question is elli has 8 and 1/2 pound bags of mints...
December 11, 2013

Math
Explain how to use a protractor to measure an angle.
December 3, 2013

Maths
A flat circular disc, of radius R, can be modelled as a thin disc of negligible thickness. It has a surface mass density function given by f(r,φ) = k(1 - r2/R2), where k is the surface density at the centre and r is the distance from the centre of the disc.Using area ...
October 28, 2013

Computer Programming using python
DO IT BY YOURSELF OR YOU WILL NOT LEARN! GOOD LUCK!
October 24, 2013

Algebra
What is the mean of all even integers from 123 to 987?
October 18, 2013

Physics
An unmarked police car traveling a constant 80km/h is passed by a speeder traveling 135km/h. Precisely 3.00s after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 1.50m/s^2 , how much time passes before the police car ...
October 6, 2013

math
sorry not 12 mths. 3200/600 = 5.3mths
September 29, 2013

math
x - 3y = 3200 y = 600 x - 3(600) = 3200 x = 5000 x/y = 12mths
September 29, 2013

maths
An initial-value problem is given by the differential equation, f(x,y) = x + y, y(0) = 1.64 The Euler-midpoint method is used to find an approximate value to y(0.1) with a step size of h = 0.1. Then use the integrating factor method, to find the exact value of y(0.1). Hence, ...
September 29, 2013

Equation
Four times a number, increased by 25 is 13 less than 6 times the number. What is the number? 4n+25=-13-6n. ???
September 11, 2013

math
I think
September 3, 2013

math
57.5 hr
September 3, 2013

English
I need to write 2 paragraphs about my favorite movie giving 4 reasons why, but don't have one. Please Help..!!
August 5, 2013

Math
I am a two digit even number. I am less than 30. When you list out all of my factors, they add up to 60. who am I?
July 28, 2013

Chemistry
Calculate delta G of a reaction with equilibrium constant, K= 9.5 x 10^5 at 25 degrees C
July 10, 2013

trig, math
There was no diagram to show me that. It was just this question.
July 3, 2013

trig, math
Given triangle ABC with a = 16, b = 14, and β = 54°, find the value of c.
July 3, 2013

Python Help
# Cis108 07/03/2014 # The PCCC Palace Hotel - Final Bill # To write a bill per party regarding there stay at the Palace Hotel including there billing invoice # Ask the user there name and number of days they will be staying in the Palace customer = input ("Enter customers...
July 3, 2013

Math
You are paneling an office that has 2 walls measuring 18' x 8' and 2 walls measuring 9' x 8'. How many sheets of paneling will you need, assuming each panel sheet measures 4' x 8'?
June 25, 2013

Math
Compute the square footage of carpet needed to cover a room 10' 6" x 12' 3". Area (to the nearest tenth) = square feet. Can you explain the steps on how to solve this problem.
June 25, 2013

Math
Tim wants to model a doll house from a real house that measures 60 feet in length by 28 feet in width. He decides to use a scale in which ¼ inch equals 1 foot. Based on this scale, What will be the length of the longer side of Tim's model? inches What will be the ...
June 25, 2013

Math
Tim wants to model a doll house from a real house that measures 60 feet in length by 28 feet in width. He decides to use a scale in which ¼ inch equals 1 foot. Based on this scale, What will be the length of the longer side of Tim's model? inches What will be the ...
June 25, 2013

Math
A vehicle covers 2,160 miles in 5.5 hours. What is the average speed of the vehicle to the nearest tenth. I got 55.5, but I don't think it is correct.
June 25, 2013

Math
Chris Shopper received a $800 discount loan to purchase a washer and dryer. The loan was offered at 10% for 120 days. What are the proceeds? I tried this problem and the answer is not 26.40
June 24, 2013

Math
prove identity Sin2x - sinx/cosx + cos2x= sinx/cosx + 1
May 19, 2013

Language
Read the poem and answer the questions that follow 1.There once was a cowboy named Ray 2. Who never had that much to say, 3. Except for the times 4. Stampedes stopped on a dime 5. When that cowboy named Ray hollered Hey 1.in which lines do you see repetition? 2. What is the ...
May 10, 2013

Math
Yes, I copied it correctly. I was wondering too. Thank you for your help
May 5, 2013

Math
How do you find the price of each share if 700 shares of stock are sold for $55.00 ?
May 5, 2013

Math ASAP please
#1 is p = 0.20k + 100. #4 is correct.
April 19, 2013

Math
crap, i screwed up writing my answers. Ignore them please.
April 7, 2013

Math
So I have a question regarding advanced functions, logarithm stuff. here is the question: Beginning with the function f(x) = log[base(a)]x ,state what transformations were used on this to obtain the functions given below: a) p(x) = -(5/8) log [base(a)]x b) r(x) = log[base(a)](...
April 7, 2013

Calculus-Inverse Functions
is the inverse function of x+ floor(x) equal to x - floor (x/2) i got this after plotting points but i'm not sure. thank you
March 31, 2013

Calculus
The continuity of floor functions the function: x - floor(x) it is continuous on what interval? i got all real numbers except for integers. is this right. thank you.
March 31, 2013

math
but why the choice for ln?
March 18, 2013

math
nevermind on 2), i would appreciate an asnwer to 1) though
March 18, 2013

math
I asked the following the other day and received the following answer: Posted by Matthew on Sunday, March 17, 2013 at 11:03pm. A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen-19 in it. When measured exactly 10 minutes later, the amount of oxygen-19 was 0...
March 18, 2013

math
The value, V, of a $25000 vehicle after y years is given by V = 25000 (0.85)y What is the rate of depreciation? (1 mark) What will the car be worth after 5 years? (1 mark) To the nearest month, how long would it take to reduce the vehicle’s value to 10% of its original ...
March 17, 2013

math
A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen-19 in it. When measured exactly 10 minutes later, the amount of oxygen-19 was 0.964 g. What is the half-life, in seconds, of oxygen-19?
March 17, 2013

Chemistry
An experiment requires 0.7 M NH3(aq). The stockroom manager estimates that 15 L of the base is needed. What volume of 15 M NH3(aq) will be used to prepare this amount of 0.7 M base?
March 8, 2013

Please help check physical science!
Please help check my answers I really want to make a 100%! 1. A mechanical wave moves through a medium, which can be (1 point) A. a liquid. B. a solid. C. a gas. D. all of the above <-- This one 2. Which type of kind of wave causes the medium to vibrate only in a direction ...
March 6, 2013

Theoretical&Experimental Probability please help!
Please check my work thanks!! A number cube with the numbers 1 through 6 is rolled. Find the given probability. 1. P(number < 2) (1 point) A. 1/6 <--- i think this one B. 2/6 C. 4/6 D. 3/6 2. P(number ≥ 3) (1 point) A. 4/6 B. 1/6 C. 2/6 <-- this i think D. 5/6 ...
March 6, 2013

Math
It would be less then the World because of the international and if you add the cost of how much it is the answer shows you that it's less.
March 2, 2013

algebra
real world situation a problem describing incresing then constant and finally decreasing
February 19, 2013

Science
a 5-kilowatt source powers a motor that is lifting a 30 kg mass straight up. how far will the mass move in 6 seconds
February 14, 2013

math 5th
help
February 12, 2013

math
Burj Khalifa is the world tallest building in Dubai at 828 m tall. The CN Tower in Toronto is 553 m tall. Sam wants to compare the Burj Khalifa and the CN Tower by creating rectangular prism models on a 10 cm by 10 cm square base. She has decided to represent the Burj Khalifa ...
January 15, 2013

Computer
More than likely the computer requires more memory.
January 10, 2013

Math
Several friends are taking turns flying a kite. Each friend flies the kite for the same amount of time. They spend 6 hours flying the kite altogether. Explain what information you need to find how long each friend flew the kite for.
January 7, 2013

Chemistry
A 208 g sample of sodium-24 decays to 13.0 g of sodium-24 within 60.0 h. What is the half-life of this radioactive isotope?
December 11, 2012

Chemistry
All isotopes of technetium are radioactive, but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decays to 100.0 g of technetium-99 in 639,000 y, what is its half life
December 11, 2012

Chemistry
What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.6 s? Please help me!!
December 11, 2012

TRIGONOMETRY
Write the following trigonometric expression as an algebraic expression in x free of trigonometric or inverse trigonometric functions sin(cos^-1 x) -1≤x≤1
December 4, 2012

math
3.56kg = G
November 27, 2012

Chemistry
16. n^2= number of orbitals
November 18, 2012

Chemistry
dE= -Rh((1/nfinal^2)-(1/ninitial^2)) Rh is a constant = 2.178E^-18
November 18, 2012

Chemistry
never mind, I figured it out.
November 18, 2012

Chemistry
Air bags are activated when a severe impact causes a steel ball to compress a spring and electrically ignite a detonator cap. This causes sodium azide (NaN3) to decompose explosively according to the following reaction. 2 NaN3(s)--> 2 Na(s) + 3 N2(g) What mass of NaN3(s) ...
November 18, 2012

Momentum ~ Physics
3
October 29, 2012

Algebra
A petroleum company has two different sources of crude oil. The first source provides crude oil that is 35% hydrocarbons, and the second one provides crude oil that is 60% hydrocarbons. In order to obtain 120 gallons of crude oil that is 55% hydrocarbons, how many gallons of ...
October 22, 2012

Physics
In reply to Jennifer, her explanation is CLOSE to be correct. Instead of converting rpm to rps, convert it to rad/s and use that as the velocity. To do this, multiply the rpm by 2π and then divide by 60. Use that and the radius in the formula then divide by 9.8 and you ...
October 3, 2012

chemistry
A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 3.9 6.5 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 260. kg. Calculate the pressure in pascals exerted by the shelf ...
September 30, 2012

Chemistry
A photocell is a device used to measure the intensity of light. In a certain experiment, when light of wavelength 530 nm is directed on to the photocell, electrons are emitted at the rate of 5.1 10-13 Coulombs/sec. Assume that each photon that impinges on the photocell emits ...
September 23, 2012

Physics
i.imgur. com/cqwun. png i'm kind of stuck.. are the answers 6, -3, -3, and 0?
September 11, 2012

math
how do you find the % on a spinner?
September 10, 2012

math
What is the compatible estimation for 329 + 64
September 9, 2012

Physics
i.imgur. com/VWFwb. png
September 9, 2012

Physics
Bernie drove home from a vacation in 1.5 hours. He traveled a total distance of 60 miles. What was his average speed in miles per hour?
September 6, 2012

Physics
A "rocket car" is launched along a long straight track at = 0 . It moves with constant acceleration = 2.5 . At = 3.0 , a second car is launched with constant acceleration = 8.7. At what time does the second car catch up with the first one? How far have the cars ...
September 5, 2012

Physics
A juggler throws a ball straight up into the air with a speed of 20. With what speed would she need to throw a second ball half a second later, starting from the same position as the first, in order to hit the first ball at the top of its trajectory?
September 5, 2012

Physics
When jumping, a flea reaches a takeoff speed of 1.5over a distance of 0.45. A.) What is the flea's acceleration during the jump phase. B.) How long does the acceleration phase last?
September 5, 2012

Math
What are two ways to read x/16?
September 4, 2012

math
1. A year on earth is 365 earth days so a year on mars would be longer. 2. 686-365= 321 days longer 321 days divided by 7 days in one week = 45.857 weeks longer.
September 4, 2012

math
500
August 29, 2012

Math
Oh, nevermind. Found it. The answer is 721 eggs...
August 28, 2012

Math
Can anyone help?
August 28, 2012

Math
Well, the thing is, the problem says that only one eggs is left over, but, four has three extra, and five has one extra... I'm throughally confused...
August 28, 2012

Math
That helps but I need a little more help than that...
August 28, 2012

Math
I have to figure out how to do this problem. I don't have the slightest idea how to even begin it, so if you can lead me through it, step by step, I would be very grateful. A woman is walking home with eggs in her bag. Suddenly, a car comes speeding towards her. She jumps ...
August 28, 2012

Algebra
algebraic expression for the sum of twice a number squared and 7
August 23, 2012

English
What is the sentence pattern for: The waterfall rushed down the steep hillside. options: s-v-io-do s-lv-pa e-v-s s-lv-pn s-v-do s-v-do-oc quest pattern s-v
August 18, 2012

Science - Chemistry
What happens when you mix Sodium Bicarbonate, Bromothymol blue, and Calcium Chloride? What is Bromthymol blue used for in this experiment?
August 17, 2012

Math
Compare. write >, <, or= 2/5 4/5 7/10 3/5 1/2 4/7
June 27, 2012

Please help!- science
how do nerve fibers in the brain send messages
May 23, 2012

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