Wednesday
September 28, 2016

Posts by Alex

Total # Posts: 3,493

science
1.the modern atomic model includes orbiting the nucleus. which of the following parts of dalton's was disproved by the discovery of the electron atoms are tiny particles atoms cannot be divided into smaller parts atoms have specific mass and size atoms have specific ...
September 30, 2015

segi college
Do you think that southwest actions are consistent with its mission?explain ways in which the firms action are consistent or inconsistent with its mission
September 29, 2015

chemistery
at 20 degree Celsius, 65.2 g of KBr will dissolve in 100 g of water. what is the mass percent of KBr in water ?
September 29, 2015

English 30-1
What is the theme of Home Place by Guy Vanderhaeghe?
September 28, 2015

Algebra II
Hi, can someone please explain how to graph piece wise functions to me? I am extremely confused. Ex.: -x+3, if x<2
September 27, 2015

algebra
jon rented a car from a company that charged a daily rental fee and a mileage charge. He rented the car for 9 days and drove 300 miles and was charged $315. His friend Amanda later rented the same car for 5 days and drive 240 miles and was charged $186. What was the daily ...
September 25, 2015

Math
Write an expression: The quotient of a number h and 3 decreased by 2. Would you write it like this: h/3-2
September 23, 2015

Gen Chem
:(
September 23, 2015

Gen Chem
Predict products and balance equations for the reactants shown. Pb 2+(aq) + H2PO4 1-(aq)--->? Pb 2+(aq) + HPO4 2-(aq)--->? Pb 2+(aq) + PO4 3-(aq)---->?
September 23, 2015

math
what is 7 to the 6th power divided by 7 to the first power.
September 23, 2015

math
Find each quotient. Express using positive exponents: 7 to the 6th power over 7
September 22, 2015

probability
The state of Ohio has several statewide lottery options. One is the Pick 3 game in which you pick one of the 1000 three-digit numbers between 000 and 999. The lottery selects a three-digit number at random. With a bet of $1, you win $500 if your number is selected and nothing...
September 22, 2015

Chemistry
Thank you!
September 20, 2015

Chemistry
A 39 g of iron ore is treated as follows. The iron in the sample is all converted by a series of chemical reactions to Fe2O3. The mass of Fe2O3 is measured to be 7.9 grams. What was the percent iron in the sample of ore? Answer in units of %. Please help me understand how to ...
September 20, 2015

engilsh
what does central claim mean?
September 20, 2015

MATH
You have to get X all by itself and your answer will be evident
September 19, 2015

CHEMISTRY !!! HELP !
I really wish I knew the answer and I would've tried to work my way around but unfortunately I don't. My teacher didn't teach me how to do these calculations and I'm doing online Hw. Thanks for your help ! I'll post the answer if I get it right.
September 19, 2015

CHEMISTRY !!! HELP !
K1*K2=(x^2*.0226)/.0158=.0000671 Which results in pH being 4.17 But it seems that my answer is still wrong. An i missing something ?
September 19, 2015

CHEMISTRY !!! HELP !
I tried with both of them but the answer was still wrong.
September 19, 2015

CHEMISTRY !!! HELP !
A solution containing 0.0158 M maleic acid and 0.0226 M disodium maleate. The Ka values for maleic acid are 1.20 × 10-2 (Ka1) and 5.37 × 10-7 (Ka2). What is the pH of the solution ?
September 19, 2015

Chemistry 101
I'm not sure but isn't there supposed to be specific heat involved in there ? (Sorry if it's a silly question, but i'm still a high school student)
September 19, 2015

Chemistry
A solution containing 0.0158 M maleic acid and 0.0226 M disodium maleate. The Ka values for maleic acid are 1.20 × 10-2 (Ka1) and 5.37 × 10-7 (Ka2). What is the pH of the solution ?
September 19, 2015

chemistry
I'm just an ordinary student like you so I might be wrong but it's H2O x Specific heat(2.09 J/g⋅C) x delta T x stands for multiplication and delta T is change in temperature
September 19, 2015

Math
I believe that is the correct answer
September 18, 2015

Physics
A Formula 1 car it heading for a straight piece of track which is 500m long. He is travelling at 220km/h. How long will he take to cover this amount of track? Time = Distance / Speed I'm confused as I don't know whether to change the distance to equal the speed's ...
September 17, 2015

Geometry
A design on the surface of a balloon is 5 cm wide when the balloon holds 71 cm of air. How much air does the balloon hold when the design is 10 cm wide? Explain the method you use to find the amount of air.
September 15, 2015

Geometry
The equation (x + 5) + (y + 3) = 169 models the position and range of the source of a radio signal. Describe the position of the source and the range of the signals.
September 15, 2015

Math
The equation (x + 5) + (y + 3) = 169 models the position and range of the source of a radio signal. Describe the position of the source and the range of the signals. How would I explain it?
September 15, 2015

History
Suspicion had always troubled the relationship between the Western powers and the Soviets. The Soviets didn't trust the West in anything, especially Stalin, though he gave them reasons that they couldn't trust him, either, when his armies began gobbling up Eastern ...
September 15, 2015

History
What factors led the wartime alliance between the United States and the Soviet Union to disintegrate into the Cold War? What would be a great short answer?
September 15, 2015

Social Studies
10 is correct
September 15, 2015

Chemistry
When 1.63 g sample of an unknown hydrocarbon is completely burned in oxygen, 4.97 g of CO2 are produced. What is the percentage by mass of hydrogen in this hydrocarbon? THANK YOUU Found out the formula: 4CH+5O2--> 4CO2+2H2O then found out the moles of CH= 0.1251 I don't...
September 14, 2015

Math
At a track meet, 50 people ran the 100-meter dash. 2 people finished in 11 seconds, 5 people finished in 12 seconds, 8 people finished in 13 seconds, 10 people finished in 14 seconds, 21 people finished in 15 seconds, 2 people finished in 16 seconds, and 2 people finished in ...
September 14, 2015

Math
Janine wants to paint just the sides of a cylindrical pottery vase that has a height of 45 cm and a diameter of 14 cm. To the nearest whole number, find the number of square centimeters she will need to paint. Explain the method you would use to find the lateral area.
September 14, 2015

Math
An hourglass, composed of two identical cones, is 12 cm tall. The radius of each cone is 3 cm. If you want to fill the bottom half of the hourglass full of salt, how much salt will you need? Explain the method you would use to find the amount of salt.
September 14, 2015

Chemistry
Calculate the number of moles of carbon atoms present in 2.2 g of ethanol (C2H6O). For this question, I would just need to find the molar mass of carbon, right? Not the molar mass of all of ethanol? So it would just be 2.2 g/ 24.02 g/mol which would equal .092. It wouldn't...
September 13, 2015

Math 9th Grade
Write an expression for the distance a car travels in t hours at a speed of s km/h
September 12, 2015

Physics
A person exerts a force of 90 N on a rope that pulls a sled across a very smooth surface. The rope is oriented 37∘ above the horizontal. The sled has a total mass of 40 kg . The sled starts at rest and moves for 10 m.
September 12, 2015

ap calculus
((1/-2-h)-1)/h
September 11, 2015

Math
if a bullet travels at 645.0m/s, what is its speed in miles per hour? can you please show me how to solve this?
September 10, 2015

Chemistry
Round each number to two significant figures: 233.356 0.002353 1.005 Can you please show me and explain how to do this? Im confused. thank you!!!
September 10, 2015

Math
A triangle has side lengths 10, 15, and 7. Is the triangle acute, obtuse, or right? Show your work and explain. I think it's gonna be an obtuse and maybe right....might be wrong...
September 10, 2015

Chemistry
Hi! I really really need help in this question: what observation is expected when: 1. an acid (nitric acid, HNO3) is added to a solution containing carbonate or bicarbonate ions? 2. silver ion is added to a solution containing chloride (or bromide or iodide) ions? Please help ...
September 9, 2015

probability
thanks Reiny, the buttons were pushed
September 9, 2015

probability
Two hunters shoot at the same duck. The probability of the first hunter hitting the duck is 0.2. The probability of the second hunter hitting the duck is 0.75. Hitting the duck results in its death. What is the probability of the duck being killed?
September 9, 2015

probability
A survey asks people about their reading habits with respect to three newspapers. The results show that 56% read newspaper A, 33% read newspaper B, and 27% read newspapers C. 7% of the respondents read newspapers A and B, 8% of the respondents read newspapers B and C, 11% of ...
September 9, 2015

Chemistry- PLEASE HELP
Hi! I really really need help in this question: what observation is expected when: 1. an acid (nitric acid, HNO3) is added to a solution containing carbonate or bicarbonate ions? 2. silver ion is added to a solution containing chloride (or bromide or iodide) ions? Please help ...
September 9, 2015

CHEMISTRY
i meant Pb304…sorry, my mistake
September 9, 2015

microeconomics
Budget constraint 1 is faced when price food = 10 and price clothing = 5. Budget constraint 2 is faced when pfood = 40/7 and pclothing = 10. The income is 100 for both budget constraints. Draw both budget constraints. Next, draw the following four consumption bundles in your ...
September 7, 2015

English: Amoretti LXXV: One Day I Wrote Her Name
What are three questions asked in this sonnet. If you can help great! If not that's fine
September 7, 2015

physics
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.09 m/s. The car is a distance d away. The bear is 20.9 m behind the tourist and running at 6.04 m/s. The tourist reaches the car safely. What is the maximum possible value for ...
September 7, 2015

microeconomics
Save Open Spaces (SOS) is a non-profit organization that promotes protection of undeveloped land. They perform two primary activities: purchasing undeveloped land for preservation and lobbying Congress for additional protection for undeveloped land. SOS has a budget of $600,...
September 7, 2015

microeconomics
Mickey is very picky and insists that his mom makes his breakfast with equal parts of cereal and apple juice. Any other combination ends up on the floor. Cereal costs 4 cents per tablespoon and apple juice costs 6 cents per tablespoon. If his mom budgets $8 per month for his ...
September 7, 2015

Physics
In a cathode ray tube, a beam of electrons is injected horizontally into the exact center of the parallel-plate region. Here L = 3.0 cm and d = 0.20 cm. The top plate has a surface charge density of σ0 = +0.15 μC / m2, and the bottom plate has a surface charge ...
September 7, 2015

Physics
Inside a metal conductor, why is it not possible to have a static charge configuration if there is a net electric field?
September 7, 2015

american history
That link doesn't have a specific site ...it brings out google ...
September 3, 2015

american history
Did the Watergate scandal have any lasting effects on the nation? Explain.
September 3, 2015

american history
What factors led the wartime alliance between the United States and the Soviet Union to disintegrate into the Cold War?
September 3, 2015

american history
What were the key aspects of Lyndon B. Johnson’s Great Society?
September 3, 2015

american history
What factors led the wartime alliance between the United States and the Soviet Union to disintegrate into the Cold War?
September 2, 2015

american history
How did the New Deal affect women, African Americans, and Native Americans?
September 2, 2015

american history
What were the causes of World War I?
September 2, 2015

Math
If Ms. Herbert gives her class a English quiz every 6 days any math quiz every 10 days when is the first day there will be a math and English quiz on the same day
September 1, 2015

american history
What was factory work like in the late 1800's?
September 1, 2015

american history
How did the spoils system affect politics during the Gilded Age?
August 31, 2015

american history
I'm still confused
August 31, 2015

american history
In the 1812-1860
August 31, 2015

american history
What arguments did supporters of the public school movement make to support their cause?
August 31, 2015

american history
Why did so many colonists protest the Stamp Act?
August 31, 2015

Chemistry
In chemical analysis, it is often necessary to prepare a solution by diluting a stock solution.Calculate how much of a 5.337M NaOH is needed to make 1.669 liters of a 0.063M sodium hydroxide solution. (Remember to include units.)
August 26, 2015

Chemistry
To determine the concentration of 10.31mL of an unknown solution of a monoprotic acid, it is titrated with 0.172M sodium hydroxide. The initial reading on the buret of sodium hydroxide is 2.19mL. The final reading is 13.41mL. What is the concentration of the unknown acid?
August 26, 2015

Social studies
Mayan priests interest in astronomy led to the creation of ____. A. a 365-day calendar B. A book of rules C. Human sacrifices D. Cave paintings Which one is correct ? Please help
August 25, 2015

Physics
19. A track consists of a frictionless incline plane, which is a height of 0.5 m, and a rough horizontal section with a coefficient of kinetic friction 0.02. Block A, whose mass is1.5 kg, is released from the top of the incline plane, slides down and collides instantaneously ...
August 24, 2015

Algebra
You invested 20,000 in two accounts paying 4% and 7% annual interest, respectively. If the total interested earned for the year was $830, how much was invested at each rate?
August 21, 2015

Art
Would it be space?
August 20, 2015

Art
1. In the image, Green Wheat Fields, Auvers by Vincent van Gogh, which of the following elements was not used to create the principle of harmony? A. Colors B. Form C. Line D. Texture 3. In the image, The Annunciation, by Jan van Eyck, which element in this image creates ...
August 20, 2015

pre-calculus urgent
Please help me here as well to clarify more my understanding. Let a1, a2, a3, . . . be a geometric sequence with initial term a and common ratio r. Show that a1^2, a2^2, a3^2, . . . is also a geometric sequence by finding its common ratio. Given that the ratio for a1, a2, a3...
August 15, 2015

pre-calculus urgent
The first term of an arithmetic sequence is 6, and the tenth term is 2. (a) Find the common difference d. d = Find the 100th term of the sequence. a100 = (b) Find the partial sum of the first ten terms. S10 = how do i do this, there's an example I tried following but it ...
August 15, 2015

Math
Drew is twice as old as his sister joy.The quotient of their ages five years ago is seven less than Joy's present age. Find out how old they are at present.
July 29, 2015

Algebra
m+7/m^2+4m-21
July 26, 2015

Chemistry
Why is the rate determining step the slowest step?
July 9, 2015

American History
What caused the King Philip's war? Can you briefly explain or send me some links to sites.
July 7, 2015

Business
Unions have a substantial impact on the compensation and work lives of both unionized and non-unionized workers. Unions raise wages of unionized workers by roughly 20% and raise compensation, including both wages and benefits, by about 28%. Unions reduce wage inequality ...
July 5, 2015

personal finance
You purchase a car $22,000. The interest rate is 5% and you decide to pay over a period of 5 years. What is your payment?
July 5, 2015

physics
You push against a steamer trunk at an angle of 33° with the horizontal . The trunk is on a flat floor and the coefficient of static friction between the trunk and floor is 0.55. The mass of the trunk is 43 kg. What is the minimum magnitude of force that will allow you to ...
June 23, 2015

Public speaking
Saying "gonna" instead of "going to" is an issue of: A. Body movement B. Eye contact C. Articulation D. Timing
June 18, 2015

Physics
A projectile of mass 0.636 kg is shot from a cannon, at height 6.6 m, as shown in the figure, with an initial velocity vi having a horizontal component of 6.8 m/s. The projectile rises to a maximum height of ∆y above the end of the cannon’s barrel and strikes the ...
June 16, 2015

Physics
Three blocks of mass 10kg, 20kg, 15kg respectively are being pushed in a row on along a horizontal surface with constant velocity by a force applied to the 10kg block.The coefficient of kinetic friction between each of the blocks and the surface is 0.18. What is the magnitude ...
June 16, 2015

physics
A jetliner is traveling east from Seattle to Chicago, a distance of 1,750 miles. The jetliner travels at an average air speed of 620 mph relative to the air. At the jetliner's altitude, the wind is blowing 46 mph to the east. How long does the journey take?
June 15, 2015

physics
An astronaut in a spacecraft looks out her window and observes a comet travel in the opposite direction at a relative speed of 237 m/s. The velocity of the spacecraft is 114 m/s directly away from the sun. What is the comet's velocity relative to the sun? Assume that ...
June 15, 2015

physics
A stone is thrown vertically upwards, reaches a highest point, and returns to the ground. When the stone is at the top of its path, its acceleration
June 15, 2015

physics
Hot air balloon A is rising upward a rate of 5.0 m/s. A passenger aboard balloon A observes balloon B rising upward at a relative rate of 7.5 m/s. What is the velocity of balloon B relative to the ground? Assume that up is positive.
June 15, 2015

physics
A test rocket is fired straight up from rest. The net acceleration is 20 m/s2 upward and continues for 4.0 seconds, at which time the rocket engines cease firing. What maximum elevation does the rocket reach?
June 15, 2015

Calculus
So don't write cos x = 0 and sin x = 0 ?
June 15, 2015

Calculus
Okay
June 15, 2015

Calculus
Yes, so what work do I need to show how I got a Absolute Maximum at pi/2 and 3pi/2
June 15, 2015

Calculus
To show how I got the answer, is the work sufficient? f(x)= sin^2(x) f'(x)=2sinx(cosx) = cosx(2sinx) cosx=0 sinx=0 f(0)=0 f(pi)=0 f(pi/2)=1 f(3pi/2)=1 Absolute Maximum is at pi/2 and 3pi/2
June 15, 2015

Calculus
On the closed interval, [0, 2*pi], find the absolute maximum of the function f(x)= sin^2(x)
June 15, 2015

Calculus
-3/2 feet per minute I meant
June 15, 2015

Calculus
Is this right? 1.5 ft = dr/dt 2x dx/dt + 2y dy/dt = 0 2(18)(2) + 2(24)= 0 72 + 48 dy/dt = 0 48 dy/dt = -72 dy/dt = -72/48 = -3/4 feet per minute
June 15, 2015

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