Most popular questions and responses by Sally
  1. Chemistry

    Hi. Is PO4(3-) polar or non-polar? Why or why not? Thanks! Look up the electronegativity of P and O. I think I remember that O is about 3.5 and P is about 2.1; therefore, each P-O bond is somewhat polar. Thus, the ion will be polar unless the Lewis

    asked on November 23, 2006
  2. Economics

    you are hired as the consultant to a monopolistically competitive firm. The firm reports the following information about its price, marginal cost, and average total cost. Can the firm possibly be maximizing profit? If the firm is profit maximizing, is the

    asked on December 5, 2006
  3. social studies

    In feudal society, who was responsible for ensuring justice was served and people's homes and lands were protected? A. peasants B. clergy C. lords D. serfs

    asked on November 18, 2018
  4. Algebra2

    Does the relation in the table represent direct variation inverse variation or neither? If it is a direct or inverse variation, write an equation to represent the relation. (x,y) (5,2) (10,1) (15,2/3) (20,1/2)

    asked on October 17, 2016
  5. Math

    Alice is covering a foam cube with fabric to make a footstool. Each side of the cube is 20 inches. How many square inches of fabric will she need? 120 in** 720 in 1,200 in 2,400 in Please help!! I'm not sure I quite get it!

    asked on April 21, 2016
  6. Algebra 2

    Describe the graph of y=1/2x-10 -3 compared to the graph of y=1/x

    asked on October 17, 2016
  7. Chemistry

    Rank the ions in order of decreasing size. Sr2+, Ba2+, Cs Cs>Ba>Sr

    asked on November 9, 2007
  8. Math

    What is the circumference of the circle? Round your answer to the nearest tenth. The radius of the circle is 12.5 cm. A) 39.25 cm B) 392.5 cm C) 78.5 cm** D)785 cm If I'm right, I guess I did it right, if I'm not, please tell me and explain if you can, if

    asked on April 20, 2016
  9. Chemistry

    A solution contains 0.022 M Ag and 0.033 M Pb2 . If you add Cl–, AgCl and PbCl2 will begin to precipitate. What is the concentration of Cl– required, in molarity, when A. AgCl precipitation begins? B. AgCl precipitation is 99.99% complete? C. PbCl2

    asked on April 21, 2013
  10. Economics

    3. Suppose the Clean Springs Water Company has a monopoly on bottled water sales. If the price of tap water increases, what is the change in Clean Water’s profit-maximizing levels of output, price, and profit? Explain in words and with a graph. Take a

    asked on December 1, 2006
  11. Math

    During its first week of business, a market sold a total of 108 apples and oranges. The second week, five times the number of apples and three times the number of oranges were sold. A total of 452 apples and oranges were sold during the second week.

    asked on December 18, 2015
  12. Math

    You want to have 1.5 million in real dollars in an account when you retire in 40 yeras. the nominal return on your investment is 11 percent and the inflation rate is 3.8 percent. What real amount must you deposit each year to achieve your goal? My answer

    asked on February 29, 2012
  13. college physics help please...

    The location of the center of mass of the partially eaten, 11 inch diameter pizza (r = 5.5) shown in Figure 9-20 is Xcm = -1.1 in. and Ycm = -1.1 in. Assuming each quadrant of the pizza to be the same, find the center of mass of the uneaten pizza above the

    asked on October 19, 2008
  14. physics

    In a thundercloud there may be an electric charge of 46 C near the top of the cloud and −46 C near the bottom of the cloud. If these charges are separated by about 6 km, what is the magnitude of the electric force between these two sets of charges? The

    asked on January 28, 2016
  15. physics

    A force of magnitude Fx acting in the x-direction on a 2.50-kg particle varies in time as shown in the figure below. (a) Find the impulse of the force. (b) Find the final velocity of the particle if it is initially at rest (c) Find the final velocity of

    asked on March 29, 2012
  16. accounting

    Logan Products computes its predetermined overhead rate annually on the basis of direct labor-hours. At the beginning of the year, it estimated that 38,000 direct labor-hours would be required for the period’s estimated level of production. The company

    asked on September 8, 2012
  17. Chemistry

    The neutralization of H3PO4 with KOH is exothermic. H3PO4(aq) + 3KOH(aq) -> 3H2O(l) +K3PO4(aq) +173.2KJ 70.0 mL of 0.207 M H3PO4 is mixed with 70.0 mL of 0.620 M KOH initially at 21.87 °C. Predict the final temperature of the solution if its density is

    asked on January 24, 2013
  18. SIG FIGS

    How many significant figures does 22.0, 0.22, 22. , 0.022? Im just confused as to the decimal addition to numbers and what the sig figs will be for them. If you don't mind can you please state some rules for sig figs that are helpful and some confusing

    asked on September 20, 2012
  19. Math

    Each pail of plaster covers 90 square feet of ceiling. What is the least number of pails of plaster you would need to buy to cover the ceiling of a square room with walls 14 feet long? 5 pails 6 pails 3 pails (my answer) 4 pails

    asked on April 4, 2016
  20. Grade 9 Science

    In each situation s below , it seems that a new substance may have been produced. Explain why each situation represents a physical change. a) A tailor makes a new suit out of a piece of fabric. b) A chef makes a salad out of lettuce, tomatoes and

    asked on September 14, 2014
  21. algebra

    BASEBALL The equation h = –0.005x2 + x + 3 describes the path of a baseball hit into the outfield, where h is the height and x is the horizontal distance the ball travels. a. What is the equation of the axis of symmetry? b. What is the maximum height

    asked on February 26, 2016
  22. social studies

    what negative impact did gold and silver mining have in the west? A. Tent cities near the mines fostered criminals as long-term residents B. ghost towns were left behind after the mines stopped producing. C. mining camps were sources of many contagious

    asked on February 12, 2018
  23. social studies

    1. What sequence of steps did the Spanish follow to establish colonies in America? A. (1) settled towns, (2) formed alliances with native Americans, (3) bought land B. (1) took over territory, (2) settled towns, (3) set up governments C. (1) formed

    asked on November 16, 2018
  24. Math help plz check my answers!

    1. Write the ratio in the simplest form. 50:10 25:5 10:2 5:1 1:5 2. Solve the following proportion. r/5= 9/21 r = 9 r = 2.14 r = 11.66 r = 37.8 3. A recipe calls for 3 cups of flour to make 3 dozen cookies. Use the proportion to calculate how much flour is

    asked on November 23, 2013
  25. Math

    A frame around a photo is 5 cm wide. The photograph is 20 cm long and 10 cm wide. What percentage of the entire area is the frame.

    asked on June 4, 2014
  26. Math

    Maria wants to cover the box shown below with paper.Which of the following could be the dimensions of the paper so that Maria has enough to cover the box, including the ends, with a little left over? Shape: Rectangular Prism Length:8 in Width: 2 in Height:

    asked on May 4, 2016
  27. Finance

    Jiminy's Cricket Farm issued a 30-year, 7.2 percent semiannual bond 6 years ago. The bond currently sells for 87.5 percent of its face value. The book value of this debt issue is $103 million. In addition, the company has a second debt issue, a zero coupon

    asked on November 23, 2015
  28. algebra2

    what do you call it when someone pays back a loan quickly??

    asked on August 29, 2010
  29. Math -___-

    The table below shows the percentage of households that own a microwave in different countries. Constuct a stem-and-leaf plot of the data. Use the ‘|’ key (Shift + \ on most keyboards, just beside the backspace key) to create the line between the stems

    asked on May 17, 2014

    What are the next three terms in the sequence? –1, 9, 19, 29, … (1 point) 38, 37, 32 40, 51, 62 39, 49, 59 38, 47, 56 2. Geoff planted dahlias in his garden. Dahlias have bulbs that divide and reproduce underground. In the first year, Geoff’s garden

    asked on May 7, 2014
  31. Math (please help)

    Maria wants to cover the box shown below with paper.Which of the following could be the dimensions of the paper so that Maria has enough to cover the box, including the ends, with a little left over? Shape: Rectangular Prism Length:8 in Width: 2 in Height:

    asked on May 10, 2016
  32. chemistry

    Solid white P melts then vaporizes at high temperatures. Gaseous white P effuses at a rate that is 0.404 times that of neon in the same apparatus under the same conditions. How many atoms are in a molecule of gaseous white phosphorus?

    asked on February 20, 2013
  33. organic chemistry

    Which one is chiral? 1,1-Dibromopropane 1,2-Dibromopropane 1,3-Dibromopropane 2,2-Dibromopropane 2-Bromo-2-chloropropane

    asked on July 24, 2008
  34. Chemistry

    3 I- (aq) +H3AsO4 (aq) + 2 H+ = I3- (aq) + H3AsO3 (aq) + H2O (l) is found to be first order with respect to each of the reactants. write the rate law. what is the over all order?

    asked on June 5, 2011
  35. Biology

    Please help with this, What was it important to have a detailed growth curve for your test plant (which was a Lemna spp.) sample on a frequent basis grown under control conditions without a test chemical?

    asked on March 17, 2011
  36. Math

    James has set up an ordinary annuity to save for his retirement in 17 years. If his quarterly payments are $650 and the annuity has an annual interest rate of 7%, what will be the value of the annuity when he retires? 650(1+.07/4)^17-1 =.3430281149

    asked on March 6, 2017
  37. Algebra

    what are the first three terms of the sequence represented by the expression n(n-1)-4? n=1

    asked on January 30, 2017
  38. Literature (Vocabulary)

    When the _1_ citizens of Reynoldsville finally realized that their forty-cent bottles of miracle sap contained nothing more than licorice extract and whiskey, they formed a lynch mob and searched for the _2_ who had sold the fake elixir. Fortunately,

    asked on April 26, 2011
  39. Walk Two Moons

    Has anyone read the story walk two moons? If so, please help. where does Sal BEGIN to realize that her mother is really not returning? A) Lake Michigan B) Madison Wisconsin C) Pipestone Minnesota *** D) Sioux Falls, South Dakota please help, I've read the

    asked on May 14, 2016
  40. Chemistry

    What will happen to the number of moles of SO3 in equilibrium with SO2 and O2 in the following reaction in each of the following cases? 2 SO3(g) equilibrium reaction arrow 2 SO2(g) + O2(g) ΔH° = 197 kJ (a) Oxygen gas is removed. increase decrease stay

    asked on March 15, 2015
  41. Physics

    One mole of an ideal gas initially at a temperature of Ti = 7.4°C undergoes an expansion at a constant pressure of 1.00 atm to eight times its original volume. (a) Calculate the new temperature Tf of the gas.______J (b) Calculate the work done on the gas

    asked on November 26, 2012
  42. Algebra

    Create a system of equations that includes one linear equation and one quadratic equation. Part 1. Show all work to solving your system of equations algebraically. Part 2. Graph your system of equations, and show the solution graphically to verify your

    asked on June 9, 2016
  43. Statistics

    A machine fills 12 ounce bottles with soda. For the machine to function properly, the standard deviation of the sample must be less than or equal to 0.02 ounce. A sample of 8 bottles is selected, and the number of ounces of soda in each bottle is given. At

    asked on December 6, 2015
  44. physics 6a

    A potential difference of 4.75 kV is established between parallel plates in airf the air becomes ionized (and hence electrically conducting) when the electric field exceeds 3.00×106 V/m, what is the minimum separation the plates can have without ionizing

    asked on May 20, 2010
  45. Organic Chemistry

    Why would the presence of crystals of sample at the starting line cause streaking on a TLC plate?

    asked on March 19, 2012
  46. Math

    Similar polygons are _____ the same size. always sometimes** never I'm having a brain fart. ahh! please help!

    asked on April 6, 2016
  47. math

    claude has 5 1/2 meters of ribbon and uses 4 2/3 meters of it how much ribbons does claude have left in simplest form

    asked on November 18, 2018
  48. Physics Help!

    Sorry I've tried 3 different ways to answer this and all have been wrong, please help me out! The moment of inertia of a 1.1 kg bicycle wheel rotating about its center is 0.15 kg*m^2 What is the radius of this wheel, assuming the weight of the spokes can

    asked on November 5, 2009
  49. AP Chemistry

    Does precipitation occur when 100. mL of 0.050 M CaCl2 is added to 100. mL of 0.10 M K2SO4? Show calculations to support your response.

    asked on April 21, 2010
  50. Physics

    The acceleration of a certain rocket is given by ax=bt where b is positive constant, find the position and velocity at t=5.0s if Xo=0 and Vo=0 and b=3.0m/s^3?

    asked on October 8, 2009
  51. Science

    Explain how gravitational, electrical, and magnetic forces act on a maglev train?

    asked on April 10, 2014
  52. College Physics

    A current exists in a wire that gradually narrows down to a smaller diameter. How do the drift velocity, the current density, and the electric field vary along the wire? Can you please help explain this?

    asked on February 4, 2010
  53. Physics

    How much work is it to push a box (mass 120 kg) up an incline (angle 16 degrees with the horizontal) that is 9.6 meters long, if the coefficient of kinetic friction between the box and the incline is 0.5?

    asked on January 27, 2015
  54. math

    Find the slope of the line through (-9,-10) and (-2,-5) A. -5/7*** B. 7/5 C. 5/7 D. -7/5

    asked on March 28, 2017
  55. Trig

    A. Find simpler, equivalent expressions for the following. Justify your answers. (a) sin(180 + è) (b) cos(180 + è) (c) tan(180 + è) B. Show that there are at least two ways to calculate the angle formed by the vectors [cos 19, sin 19] and [cos 54, sin

    asked on April 17, 2010
  56. Language Arts

    Which sentence uses a participial phrase? A) The fence, which was broken and dirty, looked terrible. B) Shutting out their opponent, the other team celebrated in victory. C) Swimming in the pool all day is my favorite way to spend the summer. D) I am

    asked on April 14, 2017
  57. Probability & Stats

    The probability that Pete will catch fish on a particular day when he goes fishing is 0.8. Pete is going fishing 3 days next week. 1. The probability that Pete will catch fish on exactly one day is: a. .008 b. .096 c. .104 d. .8 Please show work

    asked on November 2, 2016
  58. Chemistry

    A 5.0-g Sample of KBr at 25.0 degrees celsius dissolves in 25.0 degrees celsius 25.0 mL of water also at 25.0 degrees celsius. The final equilibrium temperature of the resulting soltution is 18.1 degrees celsius. What is the enthalpy of of solution in

    asked on December 2, 2010
  59. Economics

    What components of GDP (if any) would each of the following transactions affect? Explain. (b) Aunt Jane buys a new house. (c) Ford sells a Mustang from its inventory. (g) Honda expands its factory in Marysville, Ohio. My Answers: (b) Investment since I

    asked on April 4, 2007
  60. physics

    A rifle with a mass of 0.9 fires a bullet with a mass of 6.0 g (0.006 kg). The bullet moves with a muzzle velocity of 750 m/s after the rifle is fired. A. What is the momentum of the bullet after the rifle is fired? B. If external forces acting on the

    asked on April 12, 2018
  61. Math

    Maria wants to cover the box shown below with paper.Which of the following could be the dimensions of the paper so that Maria has enough to cover the box, including the ends, with a little left over? Shape: Reactangular Prism Length:8 in Width: 2 in

    asked on May 4, 2016
  62. College Chemistry

    Of KCl and NaCl, which has a higher lattice energy? What is lattice energy? Lost. Please help.

    asked on October 24, 2010
  63. algebra

    Triangles ABC and DEF are similar. Find the area of triangle ABC. Round your answer to the nearest tenth. the answer should be __________m^2 triangle abc has a 12m. triangle def has 12m and 18m.

    asked on March 9, 2013
  64. Geography

    In southwest asia most people live?

    asked on June 6, 2017
  65. math

    A tree that is 100 feet tall casts a shadow that is 150 feet long. Determine the angle at which the rays of the sun hit the ground, to the nearest degree.

    asked on April 23, 2012
  66. math

    Solvefor y: x2 = a2 + b2 − 2aby

    asked on April 11, 2010
  67. math

    If there is 1/6 of a cake and Mitchell only wants 3/12 of it, how much of the cake does he want

    asked on October 11, 2012
  68. Trig

    Find sin(s+t) and (s-t) if cos(s)= 1/5 and sin(t) = 3/5 and s and t are in quadrant 1. =Sin(s)cos(t) + Cos(s)Sin(t) =Sin(1/5)Cos(3/5) + Cos(-1/5)Sin(3/5) = 0.389418 Sin(s-t) =sin(s)cos(t) - cos(s)sin(t) =sin(-3/5)cos(1/5) - cos(1/5)sin(3/5) =Sin-3/5

    asked on May 7, 2015
  69. Physics

    A system undergoes a two-step process. In the first step, the internal energy of the system increases by 368 J when 144 J of work is done on the system. In the second step, the internal energy of the system increases by 24 J when 248 J of work is done on

    asked on April 27, 2008
  70. Economic

    3. A large share of the world supply of diamonds comes from Russia and South Africa. Suppose that the marginal cost of mining diamonds is constant at $1,000 per diamond, and the demand for diamond is described by the following schedule. Price/Quantity:

    asked on December 5, 2006
  71. chemistry

    3. Use the mole ratio of CuO produced per mole of malachite to write a balanced equation for the malachite decomposition reaction. Assume that CO₂ is also a product of the decomposition. CuCo3*Cu9OH)2 -----> 2Cuo+Co2+H2O 0.004522431 moles of malachite

    asked on May 3, 2010
  72. Math


    asked on July 7, 2013
  73. business math

    Anny invests $8,500, at 6% interest, compounded quarterly for 12 years?

    asked on March 31, 2015
  74. Algebra

    Using Cowling’s Rule what is the age of the child if the adults dose is 500mg and the child dose is 187 mg?

    asked on October 17, 2014
  75. Math

    Andy has set up an ordinary annuity to save for his retirement in 16 years. If his semi-annual payments are $250 and the annuity has an annual interest rate of 7.5%, what will be the value of the annuity when he retires? How do I solve this equation? What

    asked on March 6, 2017
  76. algebra

    Triangles ABC and DEF are similar. Find the perimeter of triangle DEF. Round your answer to the nearest tenth.

    asked on March 1, 2013
  77. adult education

    The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 290 hours and a standard deviation of 6 hours. What percentage of the bulbs have lifetimes that lie within 1 standard deviation to either side of the mean?

    asked on May 23, 2009
  78. History

    In the Byzantine Empire, the emperor A) controlled the church** B) took orders from people C) obeyed church leaders D) always helped defend Italy Ugh please help!

    asked on May 10, 2016
  79. algebra 2

    Who discovered the Worlds Smallest Glacier?

    asked on August 20, 2013
  80. physics

    A 67.5-kg basketball player jumps vertically and leaves the floor with a velocity of 1.66 m/s upward. (Take upward as positive and forward as positive.) (a) What impulse does the player experience? magnitude direction (up,down, back or zero) (b) What force

    asked on March 29, 2012
  81. Economics

    Consider an economy with a constant nominal money supply, a constant level of real output Y = 100, and a constant real interest rate, r = 0.10. Suppose that the income elasticity of demand is 0.5 and the interest elasticity of money demand is –0.1. By

    asked on March 19, 2012
  82. Algebra

    Scores on a statewide standardized test are normally distributed with a mean of 12.89 and a standard deviation of 1.95. Certificates are given to students whose scores are in the top 2% of those who took the test. This means that they scored better than

    asked on June 9, 2016
  83. Grammar

    Our coach, Mrs. Sterner, is very encouraging on the field. What is the appositive in the sentence? a. coach b. very encouraging c. field d.Mrs.Sterner * help! I'm bad at grammar. Ms. Sue??

    asked on April 29, 2016
  84. math

    Ava made 100 paper cranes, and Brittany made 3/4 of the number of paper cranes Ava made. Ava gave 9/20 of her paper cranes to Brittany. Then, Brittany gave 1/4 of her paper cranes to Ava. How many more paper cranes did Brittany have than Ava in the end?

    asked on May 21, 2015
  85. Chemistry

    a) moles of malachite in 1g: 1g / (221.12g/mol) = .004522 mol (b) moles of CuO produced: .72g / (79.55g/mol) = .009051 mol (c) ratio of moles of CuO produced per moles of malachite decomposed: 2CuO/CuCO3(OH)2 2*79.5/221.1 = 0.719 3. Use the mole ratio of

    asked on May 3, 2010
  86. Health

    The following is a health benefit of a nicotine substitute: it is cheaper than regular cigarettes so you can still get the benefit of nicotine at a lower cost. true false** I have no clue. can someone please help me?

    asked on April 12, 2016
  87. physics

    A car starts from rest and travels for 6.0 s with a uniform acceleration of +2.4 m/s2. The driver then applies the brakes, causing a uniform acceleration of −1.0 m/s2. If the brakes are applied for 3.0 s, determine each of the following. (a) How fast is

    asked on February 3, 2012
  88. Math

    First round to the nearest whole number. 9.86 x 9.13 Use compatible numbers to estimate each quotient. 32.2 divided by 7.56

    asked on August 23, 2018
  89. Science

    Why is a gas able to flow? It's particles have melted and can move around. It's particles have high viscosity and can move around. It's particles have enough energy to move around. It's particles have enough pressure to move around.** not sure of the

    asked on April 6, 2016
  90. math word problems

    nilsa is working on a 60 minute math test. there are 20 questions on the test. if it takes her 20 minutes to complete 12 of the questions, what is the greatest amount of time on average she can spend on each of the remaining 8 questions.

    asked on October 22, 2014
  91. physics

    A skater of mass 74.5 kg initially moves in a straight line at a speed of 5.10 m/s. The skater approaches a child of mass 37.5 kg, whom he lifts on his shoulders. Assuming there are no external horizontal forces, what is the skater's final velocity?

    asked on March 10, 2012
  92. Chemistry help!!!

    Calculate [H3o+] in each aqueous solution at 25*C, and classify each solution as acidic or basic. a. [OH-]= 1.1 x 10^-9M b. [OH-]= 2.9 x 10^-2M c. [OH-]= 6.9 x 10^-12M

    asked on March 14, 2011
  93. physicsa 6a

    A charge of 28.0 is placed in a uniform electric field that is directed vertically upward and that has a magnitude of 4.00×104 . What work is done by the electric force when the charge moves

    asked on May 18, 2010
  94. Chemistry

    2. 12.5 ml of 0.280M HNO3 and 5.0mL of 0.920M KOH are mixed. To make the resulting solution neutral, which of the following should be added? -1.1 mol HCl -1.69 mL of 0.650M HBr -0.55 mmol Mg(OH)2 -2.2mL of 0.50M LiOH -none of the above; already neutral

    asked on January 28, 2011
  95. Basic chem question

    3dz2 how many orbitals can this have?? what is the z?

    asked on October 21, 2008
  96. science

    1.what causes a plant to grow into that specific plant is it genetics or environment?

    asked on February 12, 2019
  97. Geometry

    Altitudes $\overline{XD}$ and $\overline{YE}$ of acute triangle $\triangle XYZ$ intersect at point $H$. If the altitudes intersect at a $123^\circ$ angle, and $\angle YXH = 26^\circ$, then what is $\angle HZX$ in degrees?

    asked on April 19, 2016
  98. physics

    Three charged marbles are glued to a nonconducting surface and are placed in the diagram as shown. The charges of each marble are q1 = 5.75 µC, q2 = 1.48 µC, and q3 = −2.47 µC. Marble q1 is a distance r1 = 3.00 cm to the left of the marble q2, while

    asked on February 13, 2015
  99. chemistry

    hemoglobin is the protein that transports O2 through the blood from the lungs to the rest of the body. in doing so, each molecule of hemoglobin combines with four molecules of O2. if 1.00 g of hemoglobin combines with 1.53 mL of O2 at 37 C and 743 torr,

    asked on February 20, 2013
  100. math

    My son has been given the collinear problem below that has be stumped two folds. 1- By trying to solve the problem using (y2-y1)/(x2-x1)=slope -- and then, find the (b) in y=mx+b for two points takes way way too long to be a 7th grade probem. My son has

    asked on January 27, 2013


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