# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,718 questions, page 593-
## Algebra

I am having a hard time with this problem 3. You are going to plant trees in your hilly backyard. Tree A is located at coordinates (1,2) and Tree B is located at (3,12). What is the slope of the hill between the two trees? Show how you arrived at your

*asked by Sydney on September 8, 2010* -
## Maths

A plane setts off from airport A and flies due east for 100 km, then turns to fly due south for 80 km before landing at an airport b show that the approximate bearing of airport b from airport a is 129

*asked by Maria on September 3, 2016* -
## English

1. I watch documentaries when I feel down. (What is the meaning of 'feel down'?) 2. This is a news program. This is an animation program. This is a game show program. This is a soap opera. This is a comedy program. (Are the expressions all correct? They

*asked by John on March 19, 2009* -
## accounting

Your team has been assigned the duty to diagram the audit trail for your company. In your diagram, show several transactions and how they would be tracked from the journal entry to the financial statement and back to the journal entry

*asked by Nicole on February 20, 2010* -
## Math

Shelley wove three rugs with Seminole designs. She wrote this expression to show the total length of all three rugs she wove. (8 7/16 + 11 9/10 ) + 15 1/10 Which shows another way to write the expression , using the Associative Property of Addition?

*asked by Anonymous on January 17, 2013* -
## Math

For a college football field with the dimension shown, the angle for kicking a field goal from a ( horizontal) distance of x feet from the goal post is given by∅(x)=tan^(-1)〖(29.25/x〗)-〖tan^(-1) (〗〖10.75/x〗) .Show that f(t)=t/(a^3+t^2 )

*asked by Amna on December 17, 2014* -
## Math

A rectangle has sides of length x cm and 2x - 4cm and the length x cm at time t seconds is given by x = 2 + 3t, (t>=0) . Show that the area, A cm^2 , the rectangle, in terms of t is A =12t + 18t^2 . Hence find the rate of change of the area at the instant

*asked by Aaqib zaman on January 28, 2015* -
## Eng. Essay - Writeacher

Writeacher or Bobpursley, or anyone who could help me with my essay. I don't know why I cannot find the post that I needed help on, my essay was on traditional families versus TV show families. I included more information. I wish I could include the link

*asked by Farrell on February 20, 2012* -
## algebra

Bob barber shop estimates their gross revenue for the second quarter to be given by the polynimal 3x^3+6x^2+3x+3. The shop estimates their cost for the quarter to be given by 9x^2-6x+5. Find and simplify the polyminal that will represent their profit. Will

*asked by mema on May 26, 2011* -
## chemistry

Here's the problem: You need to make 300L of 2.25M perchloric acid. It costs $25.95 for a 4.00 liter bottle of 60% HClO4, and $34.95 for a 4.00 liter bottle of 70% HClO4. Should you buy the 60% or the 70% bottles? Show your calculations and explain.

*asked by Evie on May 5, 2011* -
## Algebra ASAP!

Radio signals travel at a rate of 3 x 10^8 meters per second. How many seconds will it take for a radio signal to travel from a satellite to the surface of the Earth if the satellite is orbiting at a height of 9.6 x 10^6. Can someone show me how to do this

*asked by Astral Tellurian on March 8, 2016* -
## statistics

Two dice are rolled and two fair coins are tossed. Let X be the sum of the number of spots that show on the top faces of the dice and the number of coins that land heads up. The expected value of X is _____ .

*asked by mike on July 22, 2011* -
## Science

Are there more particles of acid in a drop of 1% hydrochloric acid (HCl) or more particles of base in a drop of 1% potassium hydroxide (KOH)? Explain how you figured out your answer. 4. Draw a diagram to show

*asked by Sam on February 3, 2011* -
## Statistics Hypothsis testing

Am I using the 2-sample T test or ANOVA? Please show all steps. test the claim that μ1 = μ2 Two samples are randomly selected from normal populations. The sample statistics are n1=11,x(bar)=4.8, s1=.76 n2=18, x(bar)=5.2, s2=.51 Assume that σ1 ≠ σ2 -

*asked by Jen on August 20, 2009* -
## English; Help/Check.

Write down what you learn about Herbert, Mr. White, and Mrs. White from their reactions to the paw. Ms.WHite: She didn't think if you asked for something you'd get something taken away for that wish. Mr.WHite: he seemed to only want the the paw for show

*asked by Unknown on February 5, 2013* -
## Algebra

Need help to an math problem. James have 15 cases, with 15 boxes per case, and 15 brands per box. Write an exponential expression using a base of 15 to show how many total brands there are in a stack of cases. How would I write that?

*asked by Anonymous on August 26, 2015* -
## statistics

Two dice are rolled and two fair coins are tossed. Let X be the sum of the number of spots that show on the top faces of the dice and the number of coins that land heads up. The expected value of X is _____ .

*asked by mike on July 22, 2011* -
## physics

A baseball thrown at an angle of 45 degrees above the horizontal strikes a building 18 m away at a point 8 m above the point it is thrown. Find the time taken by the ball to hit the building. Can someone please show me how to set the problem up?

*asked by tanner on September 27, 2016* -
## Algebra 2

how do i do these problems???? Graph each pair of equations in the same coordinate plane. Find the coordinates of the point where the graphs intersect. Then show by substitution that the coordinate satisfy both equations. 1. 2x + 5=0 2x + y=8 Graph each

*asked by Jessica on August 17, 2010* -
## College Physics

Two crates are connected by a massless rope that passes over a pulley. If the crates have mass 33 kg and 82 kg, find their acceleration. If the system begins at rest, with the more massive crate a distance 12 m above the floor, how long does it take for

*asked by Shannon on October 13, 2014* -
## env, sci

distinguish between the first law of thermodynamics energy and the second law of thermodynamics energy Energy as defined in both laws has the same meaning. It is the laws that are different. The second law involves the direction of heat flow, the role of

*asked by Susan on July 14, 2007* -
## physics

A mine car, mass= 440 kg rolls at a speed of 0.50 m/s on a horizontal track. A 150-kg chunk of coal has a speed of 0.80 m/s when it leaves the chute. The chunk of coal falls into the car at a 25 degree angle. Determine the velocity of the car/coal system

*asked by Sandhya on November 28, 2008* -
## physics

Four very thin rods, each 13 m long, are joined to form a square, as part (a) of the drawing shows. The center of mass of the square is located at the coordinate origin. The rod on the right is then removed, as shown in part (b) of the drawing. What are

*asked by Tyler on January 19, 2017* -
## Chem

When 0.0500 moles of HCL is reacted with 0.0500 moles of NaOH in 50.0 mL of water, the temperature of the water increases by 13.7 degrees C. Caclulate the heat for this reaction in terms of joules per mole of HCl. The heat capacity of the system is 209.2

*asked by Kyle on October 26, 2008* -
## Physics

From your intergalactic survey base, you observe a moon in a circular orbit about a faraway planet. You know the distance to the planet/moon system, and you determine the maximum angle of separation between the two and the period of the moon's orbit.

*asked by Megan on June 10, 2012* -
## Chemistry

A coffee cup calorimeter contains 100.0 g of water at 10.0 ◦C. A 72.4 g sample of iron is heated to 100 ◦C and dropped into the calorimeter. Assuming there is no heat lost to the coffee cup, calculate the final temperature of the system. The specific

*asked by kika on April 7, 2015* -
## physics

Four very thin rods, each 5.9 m long, are joined to form a square, as part (a) of the drawing shows. The center of mass of the square is located at the coordinate origin. The rod on the right is then removed, as shown in part (b) of the drawing. What are

*asked by Day on February 27, 2012* -
## Social Studies (please check ms. sue)

1. Why did farm prices fall in the 1950’s? a. Farmers bought new expensive machinery b. Farmers produced more than they could sell*** c. Farmers could not sell their products in Europe d. Farmers saw their government subsidies reduced 2. What shortage

*asked by SpitFireRedHead on April 22, 2016* -
## Art

Think about how different class systems of people are represented during Art of Europe and America (1700 - 1900). Looking at the values and representation of values or ideas, please compare and contrast the visual subject, form, and content of these two

*asked by Amy on July 2, 2015* -
## World History

I need to cover the most important developments in agricultural and pastoral production in central Africa during the middle ages (600-1450). Also, I can cover the creation, expansion, and interaction of economic systems in place of the subtheme. I'm out of

*asked by Anonymous on November 12, 2007* -
## physics oscillator energy

a block of wood of mass 0.25kg is attached to one end of a spirnf og constant stiffness 100N/m. The block can oscillate horizontally on a frictionless surface, the other end of the spring being fixed. a) calculate the maximum elastic potential energy of

*asked by Jess on November 3, 2008* -
## Math

Suppose that the service rate to a waiting line system is 10 customers per hour (exponentially distributed). Analyze how the average waiting time is expected to change as the arrival rate varies from two to ten customers per hour (exponentially

*asked by Rachael on September 14, 2013* -
## mathematics sequence need help

4, 10, 16, 22,... are the A.P obtained from the 1st differences of a Quadratic Sequence with a 1st term of 3. Determine the formula for the sequence & hence its 25th term plz show step

*asked by adn on March 29, 2017* -
## chemistry

Show a balanced equation for a diprotic acid reacting with a tribasic base. I have an example of a diprotic acid as H2SO4 and a triprotic base as H3PO4. can i use those? if so please help balance.

*asked by jamieson on November 19, 2009* -
## math

Draw a diagram to show that there are two tangent lines to the parabola y = x2 that pass through the point (0, −25). Find the coordinates of the points where these tangent lines intersect the parabola.

*asked by Kyle on January 9, 2016* -
## Physics

A nurse counts 72 heartbeats in 1 min. Show that the frequency and period of the heartbeats are 1.2 Hz and 0.83 s, respectively. I responded as: frequency=72hb/min*1min/60sec Is this correct? Thank you

*asked by Tracee on August 19, 2013* -
## Algebra

The question says given the function f(x)find the following: a graph is then shown with a) f(-1) b) f(3) c) find x when f(x) = -2 I have no idea where to start. I can't show you the graph here but there is a line with a starting point and ending point

*asked by Ardine on September 20, 2014* -
## algebra

Janet bought 5 shirts for s dollars each and 3 pairs of shoes for p dollars each. Write an expression to show the total that janet spent on the shoes and shirt

*asked by malina on February 6, 2012* -
## ethics

Just have a question if to if anyone can show me how to set up a APA citation reference and a in-text citation...... Also how to set up APA format..I read the directions and still get it wrong, so if anyone knows how to simplify it for me I would

*asked by stephanie on February 13, 2010* -
## science

the tracks of the astronauts who landed on the moon are still there in the dust and show no signs of being worn away.this is attruted to the lack of atmosphere on the moon. which of the following best accounts for the lack of atmosphere.

*asked by zach on November 8, 2011* -
## Physics 1401

A 30 N object I a hung from a scale and dunked in water (density of 1000 kg/m^3), the measurement on the scale is only 20 N. what is the density of the object? Answer is 3000 kg/m^3, can someone show me how? Would be very appreciated.

*asked by Amanda on April 30, 2017* -
## English

To show emphasis, what helping verb would you use to fill in the blank in this sentence? I _______ think I have master French prounciation. A. might B. must C. do D. can I think the answer is "C" I do think I have master French prounciation.

*asked by Sandia on December 8, 2012* -
## Math

My english teacher gave us 8 possible essay questions that might show up on are exam. She said she will put three of those essays on the test for us to do. She said that we could figure out the ones that she was going to put on there. If there is 8

*asked by Unknown on October 27, 2009* -
## math

Abe creates a scatter plot showing students’ ages on the x-axis and their heights on the y axis. Which type of trend will the scatter plot show?

*asked by Need help on May 10, 2017* -
## Math

Ramon, a single taxpayer, has adjusted income for 2015 of 98,000 and his itemized deductions total 19,000. What taxable income will show in 2015?

*asked by Larry on February 20, 2016* -
## Calculus

Show that limit as n approaches infinity of (1+x/n)^n=e^x for any x>0... Should i use the formula e= lim as x->0 (1+x)^(1/x) or e= lim as x->infinity (1+1/n)^n Am i able to substitute in x/n for x? and then say that e lim x ->0 (1+x/n)^(1/(x/n)) and then

*asked by Frederick E. on November 9, 2011* -
## physics

Show that the atm.pressure of 1.013x10^5Pa will support (a)10.3m of water (b)760mmHg of Hg.If the density of water is 10^3kg/m3 and density of mercury is 13.6x10^3kg/m3.

*asked by Y.Abdulsalam on December 10, 2017* -
## Algebra 1: 8th Grade

Explain why the graph of an equation in the form y=kx always goes through the origin. Give an example of a graph that shows direct variation and one that does not show direct variation. I don't really get the question.

*asked by Joy on October 7, 2008* -
## Pre Algebra

I have a rectangle that represents one whole. There are three sections that equal 1/3 each. I want to subdivide those sections into even & uneven squares. EX: 1/3 divided by 2 = 1/6 I am having trouble identifying the uneven squares. Could you please show

*asked by Kyle on September 11, 2015* -
## Maths (URGENT)

The values for x when f(x) = 0 are: x=-2 and x=3 My question is: The function f(x) can be written in the form of a(x-p)(x-q)(x-r) Write down one possible set of values for p, q, and r? Now Ive got the correct answer x = -3, 2 and 2 Could you show me step

*asked by Adrianna on October 1, 2009* -
## math

my watch is twelve minutes slow .the bus for which I am waiting should have arrived at 3.49pm but it is five minutes late. What time would my watch show when the bus arrives?

*asked by sara on May 7, 2017* -
## science/math

sandy made a drawing of a rec tangle to show the area of the library. what is the area ,in square yards of the library? what stands for (1) square yard

*asked by johnathan on May 3, 2010* -
## Calculus

Find the x-coordinates of any relative extrema and inflection point(s) for the function f(x)=9x^1/3+9/2x^4/3. I've gotten -0.5 as the relative minimum and x=1 for the inflection points. Is this correct? If not, can you show me how to get the correct answer

*asked by Kait on December 17, 2017* -
## math % problem

At birth a baby weighed 8 pounds 4 ounces. Two days later the baby weighted 7 pounds 12 ounces. What percent of it's weight had it lost? (show me the steps please)

*asked by Melissa on March 8, 2009* -
## 2nd grade

lucy's shade is covering nine-twelfths of her window. draw and clor nine-twelfths of a square to show lucy's window.Write te correct fraction

*asked by natalie on January 20, 2010* -
## physics

research on the physics of living systems.give to examples to show how physics help to understand the concepts of evolution,biological systems of living organisms.

*asked by tarun on July 7, 2016* -
## Math Help

Directions: Decide whether the statements are true or false by using partial fraction decomposition. If the statement is false, show the correct way to decompose the partial fraction. 3/x^2+x-2=-1/x+2+1/x-1

*asked by Alexander on March 19, 2015* -
## Maths

By expanding the inequality(the square root of A-the square root of B)^2>0,show that the arithmetic mean of two unequal numbers is greater than their geometric mean.Check by using the numbers a)10 b)2root2 c)2/3

*asked by Efa on July 28, 2016* -
## Finance

Could someone show me how to calculate average tax rate. What would be the average tax rate for a person who paid taxes of $4,864.14 on a taxable income of $39,870? Can someone help please?

*asked by Marie on February 2, 2011* -
## Math

Ramon, a single taxpayer, has adjusted income for 2015 of 98,000 and his itemized deductions total 19,000. What taxable income will show in 2015?

*asked by Larry on February 20, 2016* -
## math

of a radio show. Each commercial is either 30 seconds or 60 seconds long. If the total comercial time during 1 hour is 13 min, how many 30-second commercials were played that hour? How many 60-second commercials?

*asked by Diana on July 27, 2010* -
## Math ms sue please help again

Jim has designed a rectangle with an area of 100 square feet and a perimeter of 401 feet. What are the dimensions of Jim's rectangle?please show me how u got the answer.

*asked by Gabby on February 13, 2013* -
## Math

after pulling into a parking spot, ms. Felix backed her car up 2 ft. write an expression with absolute value to show the distance she traveled after pulling into the parking spot

*asked by Anonymous on March 23, 2015* -
## Math

Jane is 5 years younger than Mary. How old is Jane if Mary is 23 years old? Please show step so I can understand how you get the answer .Because word problem confuse me.Thank you in advance

*asked by Missy on February 2, 2018* -
## Maths

The values for x when f(x) = 0 are: x=-2 and x=3 My question is: The function f(x) can be written in the form of a(x-p)(x-q)(x-r) Write down one possible set of values for p, q, and r? Now Ive got the correct answer x = -3, 2 and 2 Could you show me step

*asked by Adrianna on October 1, 2009* -
## Maths

Show that the relation R defined on set A of all polygons as R={(P1,P2):P1 and P2 have same number of sides},Is an equivalence relation. What is the set of all elements in A related to the right angle triangle T with sides 3,4,5?

*asked by Gash on April 14, 2019* -
## Vector Calculus

2. Use the properties of the dot product to show that (⃗b·⃗c)a−(⃗a·⃗c)⃗b is perpendicular to ⃗c. Must be shown for arbitrary vectors. Im sorry, I'm really stuck on this. I know that is a vector is perpendicular to another their dot product

*asked by Lizz on January 30, 2012* -
## Calculus

Show that the rectangle with the largest area that is inscribed within a circle of radius r is a square. Find the dimensions and the area of the inscribed square. My respect goes to those who know how to tackle this one.

*asked by Evie on April 19, 2008* -
## math

Nancys birthdays is beteen aug 10 and aug 24. the date of her birthday is not an even number. the sum of the digits is 4. show how to find the date of nancys birthdat

*asked by franklynn on August 21, 2014* -
## math

Nancys birthdays is beteen aug 10 and aug 27. the date of her birthday is not an even number. the sum of the digits is 4. show how to find the date of nancys birthdat

*asked by franklynn on August 21, 2014* -
## CHEMISTRY!!!=0

Determine pH of each solution: b) 0.20 M CH3NH3I I did.... CH3NH3^+ +H2O -> CH3NH2 + H3O^+ 0.20 ---------------0--------------0 0.20-x--------------x------------x so i got... ? =x^2/0.20-x i looked up in the back of the book and found the Kb of CH3NH2 to

*asked by ALISON on March 1, 2012* -
## Chemistry

Which of the following pairs of compounds will give a precipitate in a diluted solution? Question 4 options: A) Cu(NO3)2 and Na2CO3 B) KNO3 and NaCl C) MgCl2 and Ba(NO3)2 D) NH4Cl and Al2(SO4)3

*asked by Katie on May 10, 2012* -
## Chemistry

A 75.0g sample of liquid contains 17.5% by mass of H3PO4 (molar mass=98.0g/mol). If 215.0mL of Ba(OH)2 is needed to completely neutralized the acid, determine the concentration (or molarity) of the Ba(OH)2 solution used.

*asked by Atia on July 20, 2019* -
## College of Medicine ;University of Malawi

what is the ph at 25 degrees Celsius of a solution made by dissolving a 5.00 grain tablet of aspirin in 0.500 litres of water? The tablet contains 0.325g of the acid HC9H7O4. ka=3.3*10^-4mm=180.2g/l

*asked by Andrew on December 3, 2015* -
## General Chemistry

A solution of 2.50g of compound having the empirical formula C6H5P in 25.0g of benzene is observed to freeze at 4.3 degrees Celsius. Calculate the molar mass of the solute and its molecular formula.

*asked by Sasha on September 4, 2011* -
## Chemistry

In a titration of 26.0 mL of 0.840 M H2SO4, __________ mL of a 0.200 M KOH solution is required for neutralization. Express your answer to the nearest 1/10 mL. Hint: remember H2SO4 is a diprotic acid

*asked by Camarra on March 10, 2010* -
## Chemistry

Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 C? The freezing point for pure water is 0.0 C and Kf is equal to 1.86 C/m. * Use Tf = Kf*i*m

*asked by Jaden on May 28, 2010* -
## chemistry

If the end point in the titration of oxalic acid with NaOH solution is super-passed (too pink), will the molar concentration of NaOH be hiegher or lower than the actual value ? Explain ..

*asked by Huda on April 2, 2011* -
## science

Calculate the pH of a solution created by mixing 200.0 mL of 0.400 M acetic acid and 200.0 mL of 1.00 M sodium acetate. Hint: The instant the two solutions are mixed what are the initial concentrations of each?

*asked by Bruce on February 14, 2011* -
## fluid mechanics problems

With the distance: 0.610 m, nutrient solution (ρ = 1040 kg/m3) can just barely enter the blood in the vein. What is the gauge pressure of the venous blood? Express your answer in millimeters of mercury.

*asked by Gun-yuoung on November 30, 2008* -
## ap chemistry

What mass of solid sodium formate (of MW 68.01)must be added to 125 mL of 0.48 mol/L formic acid (HCOOH) to make a buffer solution having a pH of 4.07? Ka = 0.00018 for HCOOH. Answer in units of g

*asked by gabriella on February 4, 2014* -
## AP Chem

When 0.076 moles of lead(II) nitrate are dis- solved in enough water to make 670 mililiters of solution, what is the molar concentration of nitrate ions? Answer in units of M

*asked by Lutesia on October 9, 2011* -
## Chemistry university level

what mass of ethylene glycol, the main component, of antifreeze, must be added to 10.0 L water to produce a solution for use in a car's radiator that freezes at -23.3 degree C? Assume the density for water is exactly 1 g/ml.

*asked by Raj on January 27, 2009* -
## Chem

A 0.170-mole quantity of NiCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Ni2 ions at equilibrium? Assume the formation constant* of Ni(NH3)62 is 5.5 × 108.

*asked by Mandy on December 5, 2013* -
## chemistry

What mass of solid sodium formate (of MW 68.01) must be added to 115 mL of 0.57 mol/L formic acid (HCOOH) to make a buffer solution having a pH of 4.16? Ka = 0.00018 for HCOOH. Answer in units of g

*asked by Anonymous on January 31, 2015* -
## Chemistry

Explain with a chemical equation why the pH of the salt solution is or is not the same as pure water: NaCl, NaC2H3O2, NH4Cl We're working with salt and buffer solutions but the equations confuse me the most. Anything helps!!

*asked by ryancon on October 3, 2018* -
## chemistry

Balance each of the following redox reactions occurring in acidic aqueous solution.Express your answer as a chemical equation. Identify all of the phases in your answer. Zn(s) + Na(aq)-> Zn2+(aq)+Na(s) Cl-(aq) + 2NO3-(aq)->NO(g)+Cl2(g)

*asked by redgy on April 23, 2011* -
## chemistry

0.1276 of a monoprotic acid (molar mass 110g/mol) was dissolved in 25ml of water.The pH of the solution was found to be 5.87 after the addition of 10.0ml of 0.0633 M NaOH.The Ka of acid is.......................

*asked by tete on April 18, 2010* -
## Quantitative Chemical Analysis

assume an unknown sample to be 15% copper, weigh enough dried ore sample to use approximatele 35-45mL of .09M S2O3-. How many grams do I need to measure out to use 40.00mL of the thiosulfate solution?

*asked by Jill on September 28, 2012* -
## chemistry

Calculate the pH and pOH of each of the following aqueous solutions of strong acd or base: (a) 0.010 M HNO3(aq) (b) ) 1.0 x 10-3M Ba(OH)2(aq) (c) 10.0 mL of 0.22M KOH(aq) after dilution to 250 mL (d) 100 mL aqueous solution containing 050 g of Ba(OH)2 (aq)

*asked by imelda on September 16, 2014* -
## General Chemistry

how many grams of a protein weighing 4500 grams/ mol must be present in 100 ml of water solution to a given osmotic pressure of 18 mm hg at 25 degrees celcius...( use formula of pie = Mrt

*asked by Sarah on December 11, 2010* -
## Chemistry

Assuming the solution you used was 95% ethanol by volume and that the density of ethanol is 0.816g/mL, how much water and carbon dioxide are produced in the experiment? Equation: C2H6O+3O2-->2CO2+3H2O

*asked by BUTCHER on April 19, 2016* -
## Chemistry

Suppose 10.2 G of copper a state is dissolved in 350 mL of a 3-0 molality solution of sodium chromate calculate the final molarity of copper assume the volume stays constant

*asked by Sabrina on April 13, 2019* -
## Chemistry

assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that freezes at -14.5 C? The freezing point for pure water is 0.0 C and is equal to 1.86 C/m .

*asked by Colin on January 27, 2012* -
## chemistry

What about this question? Calculate the mass (g) of PbSO4 that will dissolve in 2000 mL of 0.0694 M K2SO4 solution. The equation represents the solubility process. PbSO4 (s) Pb2+ (aq) + SO42- (aq) Ksp = 1.7 x 10-8

*asked by Confused on October 16, 2010* -
## Chemistry

A weak acid HA (pka=6.00) was titrated with 1.00M NaOh. The acid solution had a volume of 100ml and a concentration of .100M. Find the pH at the following volumes of added base. Vb=20ml

*asked by Layla on April 25, 2016* -
## Chemistry-Help Dr. Bob222

If a weak acid has a dissociation constant of 6.4 x 10^-6, what is the pH of a solution of this acid in a 0.10 molar concentration? I still don't understand the equation you gave me. My textbook doesn't break it down like this, so I'm confused as to where

*asked by Maddy on December 14, 2010* -
## Chemistry

A student dissolved the KHP in 100.0mL of water instead of 50.0mL. Will the molar concentration of the NaOH solution determined from titrating be greater, less than, or unaffected by this mistake? Explain.

*asked by Lola on April 2, 2013* -
## Program Design

You require an algorithm that will receive an integer from the screen, add 5 to it, double it, subtract 7 from it, and display the final number on the screen. Need help with the input, output, and processing. Also with the solution algorithym.

*asked by Kemp on September 8, 2008* -
## algebra

Let D = {(a,b,2a): a,b all real numbers} The set of vectors in R^3 with last entry twice the first. E = span{(1,0,2),(2,-1,4),(0,-3,0)} Prove that D = E I first made an augmented matrix to find out that there is a free variable of x3. Showing that there is

*asked by Daniel on June 7, 2013*

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