# why does the equation x^2=-9 has no real solution why does the equation x^2 = 9 has two solutions

56,329 questions, page 252-
## chemistry

a 2.00l buffer contains 1.00 mol HNO3 mixed with 1.00mol NaNO2 a. write the relevant ionization equation for this buffer. b. determine its pH c. determine the new pH if 1.00g of NaOH is added to the buffer.

*asked by mehek on December 29, 2014* -
## Math - solving quadratic equations with factoring

A person jumps off a 20m high cliff into water below. The height of the person above the ground at time t seconds is given by the equation h=-5t^2+30. How long does it take the person to reach the half way mark to the water?

*asked by Amy on January 24, 2012* -
## math 12

i got the wrong answer from the back, and i know that imnot dooing it right. please try to help me on this hard question. THE ANSWER WAS:16 solve the equation: 3log(x-15)= (1/4)^x i don't know how to solve it algerbrically. the teacher doesn't want us to

*asked by kajal on June 2, 2011* -
## math

Set up an algebraic equation for this problem:When Brett and his younger sister add their ages together the sum in 17. Brett is not a teenager yet. In fact his age is not even a two-digit number. How old is Brett's sister?

*asked by Lucy on December 15, 2011* -
## Chemistry

Considering the tube wherein HCL (1 M) was added to ethyl 4-aminobenzoate. a) what reaction would occur in the tube? b) write a balance equation that supports your explanation above? c) describe what would happen if u added NaOH (6 M) to the same tube?

*asked by Neets on February 4, 2009* -
## O-CHEM

Considering the tube wherein NaOH (1 M) was added to benzoic acid. a) what reaction would occur in the tube? b) write a balance equation that supports your explanation above? c) describe what would happen if u added HCL (6 M) to the same tube? please

*asked by Nina on February 3, 2009* -
## Chemistry

Anhydrous aluminum oxide can be reduced to aluminum according to thisa chemical equation: 2 Al2O3 (s) ---> 4 Al (l) + 3 O2 (g) Calculate the mass of aluminum oxide reacted if 82 g of Al was produced and the percent yield was found to be 89.3%

*asked by Kristin on October 18, 2013* -
## Chemistry

Considering the tube wherein NaOH (1 M) was added to benzoic acid. a) what reaction would occur in the tube? b) write a balance equation that supports your explanation above? c) describe what would happen if u added HCL (6 M) to the same tube?

*asked by AMY on February 5, 2009* -
## physics

A uniform ladder of mass m and length L leans at an angle θ against a frictionless wall. If the coefficient of static friction between the ladder and the ground is 0.43, what is the minimum angle at which the ladder will not slip? Do i use the equation

*asked by Sydney on January 17, 2011* -
## Chemistry

45.1 grams of Sodium Chloride is combined with 72.3 grams of barium phosphate. Balance the following equation NaCl + Ba3(PO4)2 --> Na3PO4 + BaCl2 How many grams of Barium dichloride will be produced?

*asked by Adam / DrBob222 on May 12, 2016* -
## Algebra

Algebra Question: A team wins 15 of their first 20 games. If they win only half the time from now on, how many games will they have to play in order to win 60% of their total games? I have it figured out manually, but cant get it in equation form.

*asked by Robert on September 12, 2012* -
## Honors Chemistry

Equation: Fe2O3 + 2Al ---> 2Fe + Al2O3. How many grams of Fe2O3 react with excess Al to make 475g Fe? Can you show me step by step how to do it? My book says the answer is 679g Fe2O3.

*asked by Anan on February 23, 2010* -
## algrebra 1

Could you explain in detail how to do the equation (5b4n ) 2 2a6 keep in mind the 4 and 6 are small numbers on the right top corner and the parenthesis are for the numbers on top and bottom. There is a line in between the upper and lower numbers too.

*asked by Andree on January 6, 2009* -
## Algebra I

I got the following question but since I haven't reached a definite answer I'm wonder if I've solved it correctly: Write the slope-intercept form of an equation of the line that passes through (-2,5) and has an undefined slope. I got: 5=-2m+b 5--2m=b

*asked by Brittany on September 22, 2015* -
## math

consider the curve defined by the equation y=a(x^2)+bx+c. Take a point(h,k) on the curve. use Wallis's method of tangents to show that the slope of the line tangent to this curve at the point(h,k) will be m= 2ah+b. have to prove this for tow cases: a>0 and

*asked by iew on May 21, 2007* -
## Math

Every year a lake becomes more polluted, and 5% fewer organisms can live in it. If in 2010 there are one million organisms, write an equation relating N, the number of organisms (in millions), to time t, in years since 2010.

*asked by George Carl on March 5, 2018* -
## Chemistry

Write a balanced equation for the incomplete combustion of gaseous pentane (C5H12) which combines gaseous oxygen to form carbon dioxide, gaseous water and carbon monoxide.

*asked by Christine on November 6, 2012* -
## Algebra

The formula v=8square root of h gives the relationship between velocity, v (in feet per second and height, h (in feet). What is the maximum velocity of a roller coaster that is 203 feet high? Can the question be solved using the equation t^2-2t-11=0?

*asked by Anonymous on November 5, 2014* -
## math

Manny receives 6 dollars each week for allowance. He also had 45 dollars saved from birthday gifts. If he currently has 111 dollars, write an equation to represent how many weeks Manny has been saving money.

*asked by sophya on June 24, 2017* -
## chem

Anhydrous aluminum oxide can be reduced to aluminum according to thisa chemical equation: 2 Al2O3 (s) ---> 4 Al (l) + 3 O2 (g) Calculate the mass of aluminum oxide reacted if 91.4 g of Al was produced and the percent yield was found to be 89.3%

*asked by vanessa on September 15, 2010* -
## Algebra

Joe had collected 20 stamps at age 6. At age 10, his collection grew to 72 stamps. Assuming linear growth, write an equation that expresses the relation between time and number of stamps.

*asked by Name on September 29, 2016* -
## Math

The area of a rectangle pool was 120 square meters. If the long side is 7 meters plus a number and the width is 6 meters. What is the value of the variable? I couldn't make a equation for this; I tried and I got 7+x+6 = 120 and that doesn't seem right.

*asked by Anonymous on November 2, 2014* -
## Chemistry

If 0.790 mol of solid TiO2 and 8.53 g of solid C are reacted stoichiometrically according to the balanced equation, how many moles of solid TiO2 remain? 3TiO2(s) + 4C(s) + 6Cl2(g) → 3TiCl4(l) + 2CO2(g) + 2CO(g)

*asked by Anonymous on February 10, 2009* -
## ALGERBRA

Patricia owned so many posters that she decided to sell 63 of them to her friends. After selling the posters, she still had 172 left. Write and solve an equation to find the number of posters p Patricia had originally

*asked by TOM on March 8, 2012* -
## college calc

Give a formula for the function illustrated using a vertical shift of an exponential function. The two points marked on the graph are A=(−1,17) and B=(1,2). The red horizontal line is given by y=1, and is a horizontal asymptote of the function. What is

*asked by harry on September 6, 2012* -
## Math

A person jumps off a 20m high cliff into the water below. The height of the person above the ground at t time seconds is given by the equation h=-5t^2+30. How long does it take the person to reach the half way mark to the water?

*asked by Anonymous on February 11, 2013* -
## algebra

janice noticed that the number of problems she did for homework (x) formed a linear relationship with her quiz score (y). When she did 3 problems she earned a 25% and when she did 8 problems she earned a 60%. Write an equation to represent this situation.

*asked by andrew on January 20, 2010* -
## AP chem

The experiment can be extended to determine the order of reaction m with respect to [OH-] by varying the concentration of hydroxide ions [OH-] Assume that the value of the pseudo-rate constant k’ was measured for two different concentrations of [OH-].

*asked by Alexa on October 26, 2015* -
## Chemistry

Benzene, C6H6, reacts with nitric acid, HNO3. Two products are formed, one of which is water. The second product has a molar mass of 213 grams. The second product is composed of 33.8% carbon, 1.42% hydrogen, 19.7% nitrogen, and 45.1% oxygen. Write a

*asked by Melissa on April 17, 2015* -
## algebra

you research the cost of a gallon of gasoline over several years to look for trends the table shows the data you have collected what is the equation of the line of best fit how much would you expect to pay for gasoline in 2029 a)y=0.538x+1.36; $33.10 b)

*asked by matt on March 14, 2015* -
## Chemistry

C2H5O2N is an important compound. The combustion reaction of glycine proceeds according to this equation: 4C2H5O2N + 9O2 ---> 8Co2 +10H2O +2N2 which is = -3857 kJ Given CO2 is -393.5 kJ/mol Given H2O is -285.6 Calculate the standard molar enthalpy of

*asked by Izzie on November 8, 2011* -
## algebra

you research the cost of a gallon of gasoline over several years to look for trends the table shows the data you have collected what is the equation of the line of best fit how much would you expect to pay for gasoline in 2029 a)y=0.538x+1.36; $33.10 b)

*asked by matt on March 14, 2015* -
## Physics

A spring force constant 210 N/m vibrates with an amplitude of 28.0 cm when .250 kg hangs from it. What is the equation describing this motion as a function of time? Assume that the mass passes through the equilibrium point with positive velocity at t=0. At

*asked by Ally on January 19, 2012* -
## chemistry

What is the volume of 6M H2SO4 required by the balanced equation to react with the CuO to produce 0.025 moles of copper(ii) sulfate. Report the volume needed BEFORE allowing for excess in milliliters to two significant figures. Don not include units in the

*asked by tj on October 1, 2014* -
## chemistry

Predict the products and then write the complete balanced chemical equation with states of matter: 1. Sulfuric Acid and sodium hydroxide 2. Aluminum and copper (II) sulfate 3. Silver nitrate and iron (III) chloride 4. Magnesium heated 5. Aluminum oxide

*asked by Graham on February 8, 2011* -
## algebra

Skip designs tracks for amusement parks. For a new design the track will be ellipitical if the ellipse is placed on a large coordinate grid with its center at (0,0) the equation x^2/2500+y^2/8100=1 model the path of the park.The units are given in yards,

*asked by lee on March 1, 2013* -
## physics

A robot probe drops a camera off the rim of a 457 m high cliff on Mars, where the free-fall acceleration is 3.7 m/s2. find the time required for the camera to reach the ground. answer in units of s. i don't know if my equation is right: * tfinal= (vinitial

*asked by Mueller on September 28, 2014* -
## science

In a chemical reaction,10.g of sodium carbonate reacted with 12 g of ethanoic acid.the poducts were 4.4g carbon dioxide,1.8g of water and 16.4g of sodium ethanoate. (a) write a word equation ,clearly showing the reactants and products as given above. (b)

*asked by saurav on February 2, 2015* -
## Chemistry

A limiting reactants problem. 6.32g of sodium sulfate is reacted with 12.03g of barium nitrate. How many grams of the precipitate would you expect to collect. The answer my teacher gave me is 16.0g BaSO4, but I cannot get it. The equation I formed is:

*asked by Lindsey on April 15, 2012* -
## Chemistry

100 mL of buffer solution that is 0.15M HA (Ka= 6.8x10-5) and 0.20M NaA is mixed with 15.2mL of 0.35M NaOH. What is the pH of the resulting solution? 100 mL of buffer solution that is 0.15M HA (Ka= 6.8x10-5) and 0.20M NaA is mixed with 28.3mL of 0.25M HCl.

*asked by Anonymous on September 29, 2018* -
## Physical Science

To create a supernaturated solution, a student heats a beaker of water on a hot plate and adds sugar until no more sugar will dissolve. The student then strains the solution through a funnel using filter paper and allows the solution to cool. Name two

*asked by SHAZAM on January 12, 2011* -
## Chemistry

Please help! I'm trying to find the solubility of Ca(OH)2 in .001305 mol/L aqueous NaOH? Saturated solution of Ca(OH)2 in 0.01305 mol/L NaOH. [HCl] = 0.1213 M Volume of HCl = 9.81 mL Volume of Ca(OH)2/NaOH aliquot = 25ml Find: 1. the TOTAL [OH-] in the

*asked by Alex on March 20, 2017* -
## economics

The manager of All City Realtors wants to hire some real estate agents to specialize in selling housing unit acquired by the Resolution Trust Corporation (RTC) in its attempt to bail out the savings and loan industry. The commission paid by the RTC to the

*asked by Ashaki on May 29, 2012* -
## English

i need this paragraph proofread plz Imagination is an influence which directs life; its powerful stimulation can lead to either positive or negative outcomes. In the play Macbeth, by William Shakespeare, imagination is a powerful force which leads Macbeth

*asked by Sam on November 26, 2009* -
## chemistry

You have a 250ml solution of 0.13M calcium iodate. How many grams of potassium iodate need to be added to the solution to begin to precipitate calcium iodate? The solubility product constant for calcium iodate is6.47 *10^-6. B) you have a 250ml solution of

*asked by anonymous on November 18, 2015* -
## Chemistry

A 10.0 L container contains 1.0 L of solution of a gas. Assume [gas]=1.5x10^-4 M in solution when 2 mol of gas remain in gas form. If 1 mol of gas is removed from the gas phase, what will be the new concentration of the gas in solution? What is the value

*asked by Sarah on February 15, 2016* -
## Jewelry markings

I have to find out what certain markings on jewelry mean. 925-I think it means silver, but I have to be more in depth. han-hand made? S O- no idea F-no idea 925 is indeed sterling silver. I have no idea on the others. The 925 specifically means 92.5%

*asked by Lisa on December 17, 2006* -
## maths

you are at the music store looking for CDs. the store has CDs for $10 and $15. you have $55 to spend. write an equation that represents the different numbers of $10 and $15 CDs you can buy. hmm now.. how do i do this?

*asked by mia on October 18, 2009* -
## math

The third and seventh terms of an arithmetic sequence are 10 and 20. 1) What is the value of the 1st term? 2) What is the value of the 9th term? 3) What is the equation to find the nth term in the sequence? HELP!! PLEASE!!

*asked by Brittany on February 2, 2011* -
## Calculus 3! ASAP please

1.A given line is described by the system of equations x=2t+7; y=-3t+4; z=5-t; find the equation of a line parallel to the given line and which contains the point (1,1,0). 2.Let a= and b=, then the component of a parallel to b is given by? - the answer is

*asked by Sally on September 22, 2015* -
## Chemistry

5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A(g) + B(g) --> 3C(g) At equilibrium, there is 4.8 x 10-5 mol of B. Calculate the value of the equilibrium constant.

*asked by Sandra on May 11, 2012* -
## Calculus-math

Find an equation of the line that is tangent tothe graph of f and parallel tothe given line. Function: 1/square root of x Line: x+2y-6=0

*asked by Anonymous on September 26, 2012* -
## math

For which table(s) of values in Exercises 39–42 is the relationship linear? Tell how you decided. Write the equation for each linear relationship. x 5 10 15 20 25 30 y 20 30 40 50 50 50 I understand this is not linear function but what is it asking me to

*asked by Alex on April 20, 2010* -
## Math

All the seats in the theater are divided into 8 groups.There are 40 seats in each group.Write and solve a division equation to find how many seats there are in the theater.

*asked by Ashely on October 19, 2011* -
## Chemistry

Write a balanced chemical equation for nitrogen gas reacts with oxygen gas to produce nitrogen dioxide gas

*asked by Elizabeth on March 29, 2010* -
## Algebra 2

Q: What is the value of b in the equation 4^2b-3 = 8^1-b? My Work/Answer: Set each sides base to 2 2^2(2b-3) = 2^3(1-b) cancelled bases out solved for b my answer - 9/7 Is my work and answer correct Thank You

*asked by Bryan on March 22, 2016* -
## PLEASE HELP CHEM!!

5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A(G) + B(G) 3C(G) At equilibrium, there is 4.8 x 10-5 mol of B. Calculate the value of the equilibrium constant.

*asked by scilover on April 21, 2013* -
## Algebra

I can't seem to solve this for x correctly...I got 128 over 55 as an answer which can't be correct. Please help me find the correct answer! Thanks! The equation is: .05x-.6(x+2)=.08 Please show the work as well as the answer. Thanks again.

*asked by Clare on October 12, 2011* -
## Math

Write the slope intercept form fo an equation of the line that passes through the given point and has the given slope 1. Point (1,1) Slope 1/4 Formula y-y1=m(x-x1) Answer : y=1/4x+0

*asked by M on October 30, 2014* -
## math

Points A and B lie on the graph of the equation y = -4.3x. What are the y coordinates for each point? Point A: (-3, ) Point B: (5, ) Not multiple choice.. confused on how to find the other points

*asked by Anonymous on October 23, 2014* -
## Math

The voltage (in volts) induced in a coil of wire is v = (2t + 1)^0.5. The current in the coil is initially 0.3 amps, and the inductance is 5H. What is the equation for the current in the coil?

*asked by Anonymous on March 13, 2014* -
## Math

Jason has 20 coins that are only dimes and quarters. The total value is $2.75. How many of these are quarters? I tried answering it but I got 5 quarters. I'm not so sure if that's the right answer. Can you show me the equation and the right answer to see

*asked by Anonymous on September 18, 2016* -
## Chemistry

For an H+ concentration, [H+], of 4.3 x 10-4 M, would this be acidic, neutral or basic? Why? I'm assuming that because it is an H+ it would be acidic and H+ means acidic and OH- means base. Is this correct? And is there a better formula for this equation?

*asked by Chris on November 29, 2014* -
## math

there are 40 jump ropes in the gym class. there are 4 times more red jump ropes than blue ropes. how many of each color are there? i can't seem to write the equation. help!!!!!!!! x+ 4x=40 5x=40 x=8

*asked by shawna on February 1, 2007* -
## math

The voltage (in volts) induced in a coil of wire is v = (2t + 1)^0.5. The current in the coil is initially 0.3 amps, and the inductance is 5H. What is the equation for the current in the coil?

*asked by Jacob on March 11, 2014* -
## Math

The sum of the squares of three consecutive whole numbers is 77. Form a quadratic equation and hence solve it to determine the numbers. (Hint: let the three consecutive numbers be x, x+1 and x+2)

*asked by Alyssa on December 7, 2014* -
## Algebra

Find an equation of the line containing pair of points (1/6, 1/3) and (5/6, 3) I can't seem to figure out the slope right, which apparently is 5. How does one get a five slope out of all these fractions?!!! To find the slope 3-1/3 = 8/3 over 5/6 - 1/6 =

*asked by Aria on May 29, 2011* -
## College Algebra

Graph the equation in the standard window and in the given window. Determine which window better shows the shape of the graph and the x- and y- intercepts: y= -2x + 24 [-15,15, -10,30] Xscl =3 Yscl =5

*asked by Anonymous on August 31, 2011* -
## Math Final *Updated* Since no one knew what it was

8. Suppose an investment of $5,000 doubles every 12 years. How much is the investment worth after 36 years? After 48 years? Write and solve an exponential equation

*asked by Name on March 14, 2018* -
## algebra

how do you write and solve an equation to determine the radius of mars the radius of earth is 6378.1 km, which is 2981.1 km longer than the radius of mars

*asked by delisa on September 12, 2009* -
## Math

Answer check please: Consider the circle (x-3)^2 + (y+1)^2 = 169. The point (15,4) is on the circle. Find an equation for the line that is tangent to the circle at this point. I got y= 5/12x-9/4.

*asked by KC on August 26, 2012* -
## Math

Please let me know if I figured this out correctly. Directions: Find the slope of a line perpendicular to the graph of each equation. 1) y= -x/5 - 7 Answer: Slope = 5 2) 2x + 3y=5 Answer: Slope = 3/2 Thank you!

*asked by Kate on January 29, 2012* -
## Chemistry

What volume of hydrogen chloride gas will result when hydrogen gas is combined with 58.35 liters of chlorine gas? I need help balancing the equation also.

*asked by doll on March 3, 2012* -
## College Algebra

Suppose that the length of a rectangle is 3 inches longer than the width and that the perimeter of the rectangle is 78. Set up an equation involving only W, the width of the rectangle.

*asked by Nina on June 16, 2008* -
## ap calculus

write the general form of the equation of the lines throught the point (a) parallel to the given line and (b) perpendicular to the given point point- (2,1) line- 4x-2y=3

*asked by kate on September 26, 2009* -
## Math (2 of 4 question)

8. Suppose an investment of $5,000 doubles every 12 years. How much is the investment worth after 36 years? After 48 years? Write and solve an exponential equation.

*asked by Name on March 14, 2018* -
## math

Find an equation for the ellipse that satisfies the given conditions. Length of major axis 6, length of minor axis 4, foci on y-axis

*asked by monic on November 10, 2012* -
## Math - Solving for Trig Equations

For the following equation, why cannot I not solve it? I keep getting an error. -- 2cosx - 3 = 0 -- I first isolated for "x" 2cosx-3 = 0 (2cosx/2) = (3/2) x = cos^-1(3/2) x = error? why? -- My textbook answer: 30 and 330 degrees --

*asked by Anonymous on November 22, 2007* -
## math

a cold front moves in at noon and in 5 hours, the temperature had dropped 23%. the temperature at 5:00 p.m. was 14%. let x be the temperature at noon. write an equation to find x.

*asked by anne on November 30, 2010* -
## math

The voltage (in volts) induced in a coil of wire is v = (2t + 1)0.5. The current in the coil is initially 0.3 amps, and the inductance is 5H. What is the equation for the current in the coil?

*asked by Anonymous on March 12, 2014* -
## Chemistry, acids and bases

(a) Find pH and pOH of 1.0 M solution of sodium benzoate, NaC6H5COO. (Ka of benzoic acid is 6.2x10^-5) (b) Calculate pH after 0.205 moles per liter of HCl was added (assume volume does not change (c) Calculate pH after 1.0 moles per liter of HCl was added

*asked by Marissa on May 6, 2008* -
## math

solve the following by a quadratic equation and then solving it. a rocket is projected vertically upwards from ground level, its height "h" meters after "t" seconds is given by the formula h=35t-5t^2 how long does it take to reach 50 meters? you should

*asked by Anonymous on April 30, 2017* -
## Applied Science Chemistry

A 0.5g mixture of Cu and CuO was treated with hydrogen at elevated temperature. CuO was reduced to Cu. Q1.) write a balanced equation for the reaction Q2.) before the experment, calculate the minimum amount in mole of hydrogen required to ensure the

*asked by Darth Chan on December 26, 2016* -
## chemistry

What mass in grams of sodium hydroxide is produced if 20.0 g of sodium metal reacts with excess water according to the chemical equation 2Na(s)+2H20(l)=2NaOH(aq)+H2(g)? Please show me step by step how to do this because I have 5 other questions like this

*asked by Chris on April 17, 2008* -
## chemistry

Based on the calculations above, which of the following equations is the one represented by this experiment? Justify your answer by comparing the moles of iron consumed and the moles of copper produced to the coefficients in the equation of your choice.

*asked by john on October 26, 2013* -
## Physics

A juggler throws a ball with an initial horizontal velocity of +1.1 m/s and an initial vertical velocity of +5.7 m/s. What is its acceleration at the top of its flight path? Make sure to consider the sign when responding. Consider the upward direction as

*asked by Alexandra on September 13, 2014* -
## maths - geometry -yr11

HI guys. find the equations of the lines represented by 4x^2 - 5xy - 6y^2 + 11x + 11y - 3 = 0 I am lost. What two lines are they asking for? And is there a general formula/appraoch to simplifying the duel equation with powers to 2? I tried turning the x^2

*asked by mike on June 19, 2008* -
## Chemistry

Use the Henderson-Hasselbalch equation to calculate the pH of a buffer prepared by adding 10mL of acetic acid to 20mL of 0.10M sodium acetate (Ka= 1.75 x 10^5 for acetic acid). Please showing working out, as am confused as to how to approach this question.

*asked by Lois on May 9, 2010* -
## chemistry

Methane reacts with an excess of chlorine gas. [it's an equation] I have the reactants: CH4(g) + Cl2(g) --> ? I was thinking single replacement, making CCl4 for sure. I'm just not sure about that hydrogen, unless it's just H2, and when balanced the full

*asked by anonymous on January 4, 2010* -
## AP Chem

Consider the following unbalanced equation: Ca3(Po4)2+H2SO-->CaSO4+H3PO What masses of calcium sulfate and phosphoric acid can be produced from the reaction of 1.0 kg calcium phosphate with 1.0 kg concentrated sulfuric acid (98% H2SO4 by mass)? I'm so

*asked by Robyn on November 4, 2008* -
## Chemistry

I've run into some difficulty with my chemistry homework. We went over this practise question in class today as an example. However, I wasn't able to fully grasp how to work it out. "How many grams of nitrogen form when 34.6 grams of nitrogen dioxide

*asked by Kara on March 28, 2016* -
## chemistry

In the formation of acid rain, sulfur dioxide reacts with oxygen and water in the air to form sulfuric acid. Write the balanced chemical equation for the reaction. (Type your answer using the format CH4 for CH4.)

*asked by skyler on February 2, 2012* -
## Chemistry

Some drain cleaners contain a mixture of sodium hydroxide and aluminum which reacts with water as follows: 2Al(s)+2 NaOH(aq)+6H2O(l)->2Na[Al(OH)4](aq)+3H2(g) What mass of hydrogen gas can be produced when 5g Al reacts with sufficient NaOH and H2O)

*asked by Christina on November 1, 2009* -
## math

An olympic swimmer is having his laps timed during practice. To be aware of his progress, the results are shown as order pairs (l, t) below: (1,19), (2,38), (3,57) (4,76). Which equation represents t, the time in seconds, as a function of l the number of

*asked by Jane on May 10, 2012* -
## math

Algebraically analyze the graph of the function f(x)= -6x^2+5x+2 . Find the vertex, axis of symmetry, range, minimum or maximum value, increasing and decreasing intervals, and zeros. Write the Quadratic equation in standard form. [Standard form is:

*asked by shannon on September 30, 2008* -
## math

A manufacturer has determined that if it sets the price of paper at x dollars per ream, then its monthly profit can be represented by the equation P = (6000 - 400x)(x - 2). Determine the y-intercept and explain what it means. The teacher said that the

*asked by Carly on December 5, 2016* -
## Algebra 2

Please help! I'm having the worst time figuring this out. 3. One of the fireworks is launched from the top of the building that is 70ft tall with an initial upward velocity of 150 ft/sec. a. What is the equation for this situation? b. When will the

*asked by S.Burris on January 22, 2016* -
## math

Assume that you make a down payment of $2000, and you finance the remainder with a five-year loan at 6.9 percent APR. 20092 total cost-2000 down payment=18092 interest=2.24$ What is the equation I need to use to figure out the monthly payments per $100?

*asked by crissy on December 27, 2016* -
## Chemistry

The electrochemical cell described by the balanced chemical equation has a standard emf (electromotive force) of -0.35 V. Calculate the value (J) for the Wmax that the cell can do under standard conditions. Round your answer to 3 significant figures.

*asked by Roger on December 3, 2010* -
## Chemistry

Thioacetoamide decomposes in hot water to produce hydrogen sulfide, which is the active reactant in the first step of this reaction. write balanced equation of thioacetoamide in water. Does what I have below make sense? C2H5NS + H2O ----> H2S + C2H3NO

*asked by Anonymous on November 11, 2010*

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