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. 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
  3. Chemistry

    A buffer consisting of H2PO4- and HPO42-, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. You were asked to prepare this buffer from K2HPO4 and KH2PO4. Identify the week acid and base components of

    asked on July 3, 2020
  4. 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
  5. 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
  6. Math

    If the average of five consecutive whole numbers is 18, what is the smallest number?

    asked on October 26, 2018
  7. math

    BOOKS A library contains 2000 books. There are 3 times as many non-fiction books as fiction books. Write and solve a system of equations to determine the number of non-fiction and fiction books.

    asked on April 4, 2016
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. SSAT

    A small cube has a length of 2 inches. How many small cubes are needed to make a larger cube whose base has a perimeter of 32 inches?

    asked on October 26, 2018
  14. 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
  15. 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
  16. 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
  17. math

    A pile of 108 identical books has a mass of 30 kg. Find (a)the mass of 150 books and (b)the number of books that has a mass of 20 kg.

    asked on August 2, 2011
  18. 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
  19. 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
  20. algebra

    Solve the formula for the variable given. P = r-c/n solve for c. (business) I have worked this problem so many times I'm getting confused. please help. Thanking you in advance

    asked on March 1, 2013
  21. 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
  22. Chemistry

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

    asked on November 9, 2007
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. Math


    asked on July 7, 2013
  30. algebra

    If four times a certain number increased by 6 is equal to 94, what is the number? If x represents the number, then which of the following equations could be used to solve the problem? 4x + 6 = 94 or 4(x + 6) = 94

    asked on July 28, 2011
  31. Chemistry

    At standard temperature and pressure (0∘C and 1.00atm), 1.00mol of an ideal gas occupies a volume of 22.4L. What volume would the same amount of gas occupy at the same pressure and 30∘C?

    asked on October 19, 2017
  32. Math

    Alex's distance form home is represented by the equation D= -0.5t +300 D represents his distance from home and t represents time in minutes How long will it take Alex to reach a distance of 182 km from home

    asked on June 9, 2014
  33. 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
  34. Check my answers? Math help.

    2. Write an integer to represent owing your friend $10. –10 *** –2 2 10 3. Write the sum as a product, then simplify the product. (–8) + (–8) + (–8) + (–8) ( 2(–8) + 2(–8) = –30 4(–8) = –32 **** 4(–8) = 32 5(–8) = –40 4. What is

    asked on September 27, 2014
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. biology

    What are the step by step in finding the answer for this? 4C6H1206 carbon atoms: Hydrogen atoms: Oxygen atoms: Molecules:

    asked on September 19, 2012
  41. 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
  42. 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
  43. Math

    sin theta = 8/17 and theta is in the second quadrant. Find sin(2theta),cos(2theta),tan(2theta) exactly sin(2theta) cos(2theta) tan(2theta) sin(2theta) would it be 2 x (8/17) cos(2theta) would be 2 x (15/17) tan(2theta) would be 2 x (8/17 divided by 15/17)

    asked on November 14, 2014
  44. Math

    A piece of wood is 8 and 7/8 in. long is cut a piece 45 1/2 in. long. If 1/16 is wasted for the cut, how much wood is left.

    asked on October 7, 2014
  45. algebra

    please help Solve for h in U= mgh. Please show steps.

    asked on May 4, 2013
  46. 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
  47. 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
  48. math

    19. A high school soccer team has two goalies. Goalie A makes the save 80% of the time. Goalie B makes the save 75% of the time. If goalie A plays 35 of the games and goalie B plays 25 of the games then: a) Determine the probability that a save has been

    asked on June 25, 2011
  49. vector

    If two vectors u and v fit the equation (u − v) • (u − v) = u•u+v•v, how must these vectors u and v be related? What familiar theorem does this equation represent?

    asked on April 13, 2010
  50. Geometry

    M is the midpoint of AB and N is the midpoint of AC, and T is the intersection of BN and CM. If BN is perpendicular to AC, BN = 12, and AC = 14, then find CT. Diagram is at:

    asked on April 13, 2017
  51. Physics

    An infinitely long, solid insulating cylinder with radius a has positive charge uniformly distributed throughout it with a constant charge per unit volume p. a) using Gauss's law, derive the expression for the electric field inside the cylinder ra c)

    asked on June 15, 2016
  52. 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
  53. physics

    A car is rounding a circular curve of radius r on a banked turn. As the drawing indicates, there are two forces acting on the car, its weight mg and the normal force FN exerted on it by the road. Which force, or force component, provides the centripetal

    asked on June 1, 2014
  54. Math

    In right triangle ABC what is the arithmetic mean (average), in degrees, of the measures of the two smallest angles? Explain how the answer is 45 degrees.

    asked on March 11, 2013
  55. math

    ...A woman has a total of $9,000 to invest. She invests part of the money in an account that pays 5% per year and the rest in an account that pays 12% per year. If the interest earned in the first year is $730, how much did she invest in each account?

    asked on February 5, 2012
  56. geometry

    A segment that is a units long makes a C-degree angle with a segment that is b units long. In terms of a, b, and C, find the third side of the triangle defined by this SAS description. You have done numerical versions of this question. Start by finding the

    asked on April 11, 2010
  57. math

    f(x)=xsquared+10 and g(x)= square root of x-1 and i have to figure out g(f(-3) i just don't know how to do it because i thought you could not have a negitive under a radical?

    asked on December 3, 2009
  58. Math

    A milk company unconditionally guarantees that an unopened, properly refrigerated container of its milk will be fresh for 5 days after the date stamped on the carton. The company's data shows that unopened containers remain fresh on average for 6 days,

    asked on May 19, 2018
  59. 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
  60. precalculus

    Find Pk + 1 if Pk = 7 + 13 + 19 + ...+[6(k - 1)+1] + (6k + 1) 7 + 13 + 19 + …+[6(k - 1) + 1] + (6k + 1) + [6(k + 1) + 1] 8 + 14 + 20 + …+[7(k - 1) + 1] + (7k + 1) 7 + 13 + 19 + …+(6k + 1) 7 + 13 + 19 + ...+[6(k - 1) + 1] + (6k7 +1) + (6k + 2)

    asked on December 14, 2016
  61. precalculus

    Find a quadratic model for the sequence. -4, -4, -3, -1, 2

    asked on December 14, 2016
  62. Algebra 2

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

    asked on October 17, 2016
  63. math

    If Will gives Molly $9, he will have the same amount of money as her. If Molly gives Will $9, the ratio of the money she has to the money Will has will be 1 : 2. How much money does Will have in the beginning?

    asked on March 29, 2015
  64. Chemistry

    How do I balance CuSO4 + NH3 + H2O = (NH4)2SO4 + Cu(NH3)4(OH)2 Thank you!!!

    asked on November 24, 2014
  65. Math - Very urgent.

    Use prime factors to find the LCD for each pair of fractions. a) 1/4, 1/8 b)1/6, 1/18

    asked on September 8, 2014
  66. Chemistry

    Yesterday we combined Hydrochloric Acid HCl with Sodium Hydroxide NaOH in a violent reaction that resulted in water H2O and common table salt NaCl. How many grams of hydrochloric acid should we use so we have exactly enough to react with 40g of sodium

    asked on June 19, 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
  68. Spanish

    Tu amigo insiste en preguntarte de quiénes son las cosas. Tú le contestas de forma muy enfática. 1.¿De quién es este sombrero? / tú 2.¿De quiénes son estos cinturones? / Tomás y Ricardo 3.¿De quiénes son estos zapatos? / Uds. 4.¿De quién son

    asked on June 2, 2013
  69. math

    the bulletin board is 48 inches long and 24 inches wide. How many yards would they need for the trim?

    asked on February 11, 2012
  70. 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
  71. algebra

    One-fifth of a flank is sawn off and three-eights of remaining piece is then thrown away.What fraction of original remains?

    asked on February 5, 2008
  72. Economics

    Problem #1: If the economy is self-regulating, wouldn’t these scenarios represent correct and sequentially accurate economic explanation? a)

    asked on April 23, 2007
  73. 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
  74. Math

    If the points (4,2) and )-1, k) are on a line that is perpendicular to the line y=2x+1, what is the value of k?

    asked on October 26, 2018
  75. Psychology

    I have to write an essay on a psychology concept and I was thinking about writing my essay on the concept of conformity. However, my professor prefers that we use media examples that occurred after the 28th of January. This example is to be used to explain

    asked on April 16, 2018
  76. 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
  77. precalculus

    Can you check my answers? 1.Find the 5th term in the expansion of the binomial. (2x - 4)8 -458,752x3 286,720x4 458,752x3 35,840x4 answer: d 2.Find the 3rd term in the expansion of the binomial. (x - 2y)12 264x10y2 1760x9y3 -264x10y2 -1760x9y3 answer:a

    asked on December 16, 2016
  78. precalculus

    Can you check my answers? 1.Which of the following shows the best next step to prove the following by mathematical induction? 3^n>n*2^n, n≥1 1.When n=1, the formula is valid because 3^1 1*2^1 3>2 2.Assuming that 3^k>k*2^k a.3^k+1>k+1*2^k+1

    asked on December 15, 2016
  79. precalculus

    find Pk + 1 if Pk=2K-1/k!

    asked on December 14, 2016
  80. precalculus

    Find a quadratic model for the sequence with the indicated terms. 3, 3, 5, 9, 15, 23, ...

    asked on December 14, 2016
  81. 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
  82. History

    In the Eastern Orthodox Chrurch icons were once forbidden by the Pope true ** false check my answers please.

    asked on May 10, 2016
  83. 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
  84. History

    The Roman Empire was largest during which emperors rule? Hadrian Nerva Marcus Aurelius Trajan*** please help!

    asked on April 6, 2016
  85. chemistry cp

    The term formula mass is a general term that can be applied to both ionic compounds and molecular compounds because (a) ionic compounds exist as individual molecules (b) molecular formulas are always empirical formulas (c) not all formulas represent

    asked on April 7, 2015
  86. Math - Very urgent.

    Use multiples to find the LCD for each pair of fractions. a) 1/2, 1/3 b) 1/4, 1/5

    asked on September 8, 2014
  87. Science

    Describe how the structure of DNA is correlated with its role as the molecular basis of inheritance in Biology.

    asked on March 28, 2014
  88. psychology

    how do various behaviors of social dominance and coutship display affect the evolutionary process

    asked on September 4, 2013
  89. calculus

    10). Find the area of the region bounded by the graph of f(x)=4lnx/x, y=0, x=5.8 11). Find the area of the region bounded by x=y^2-1y, x=0

    asked on April 14, 2013
  90. Physics

    If a Mack truck and Honda Civic have a headon collision, upon which vehicle is the impact force greater and which vehicle experiences the greater acceleration? I know they have same force.

    asked on March 1, 2013
  91. 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
  92. 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
  93. Psychology

    what is the study called where the same people are tested repeatedly at different ages?

    asked on December 5, 2012
  94. Chemistry

    how do you balance the equation with H3PO4(aq)and BaCl2(aq)?

    asked on October 21, 2012
  95. 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
  96. celebrity fame

    are taylor lautner and lily collins going out????

    asked on January 10, 2012
  97. Math

    Express 120:80 as a ratio. Express 60:560 as a fraction.

    asked on December 6, 2011
  98. Math - Data please help!

    1) A lotery has 1,000,000 tickets and draws 100 tickets to award prizes. How many tickets would you expect to have to purchase before you would win a prize? 2) Lesley claims she can roll triples with three dice in fewer than 20 rolls. a)what is the

    asked on December 6, 2011
  99. algebra

    1. What is the equation of the line that passes through (4,-1) and (-2,3)? 2. What is the equation of the line with an x-intercept of -1 and a y-intercept of 2?

    asked on August 6, 2011
  100. music

    what similarities does Claudio Monteverdi and Antonio Vivaldi have in common?

    asked on April 15, 2011


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