Popular questions and responses by shay
  1. Chemistry

    which sign of chemical reaction is not detectable by sight?

    asked on October 3, 2012
  2. Algebra

    Graph the line whose x-intercept is -8 and whose y-intercept is -7

    asked on April 22, 2011
  3. Pre calculus

    Find cos theta and cot theta if sin =1/4 and tan theta

    asked on September 8, 2019
  4. Physics

    Please check my answers: The voltage across a 10-ohm resistor carrying 3 amps must be? I got 30 volts-v=?, I=3 amps, R= 16 ohm. v= 30 amps * 10 ohm=30 volts A 4-ohm resistor is connected in parallel with a 6 ohm resistor. What is the total resistance of

    asked on October 24, 2007
  5. chemistry

    Radon-222 undergoes alpha decay.what is the nuclear equation

    asked on September 26, 2012
  6. Economics

    The accompanying table shows a car manufacturer’s total cost of producing cars: Qty |TC| Variable Costs| Avg. Var. Costs| Avg. Total Costs| Avg. Fixed Costs 0 |$500,000| ---- | ---- | ---- |---- | 1 |540,000 | 2 |560,000 | 3 |570,000 | 4 |590,000 | 5

    asked on May 25, 2011
  7. Geometry

    Write a rule in function notation to describe the transformation that is a reflection across the y-axis. A. Rx-0(X,Y) B. Ry-0(X,Y) C. Ry-x(X,Y) D. Rx--1(X,Y)

    asked on March 27, 2014
  8. algebra

    P=b+2s Solve for s

    asked on April 21, 2011
  9. Technology

    Which of the following is one way to assess whether or not a learning game is effective? A.Being able to win the game B.Doing the quiz before and after the game to see what you have learned.*** C.Making it difficult to win the game D.Simulating winning

    asked on March 6, 2019
  10. chemistry

    What two conditions necessary for molecules to be polar? Her's my answer pls check. First, at least one covalent bond in the molecule has to be a polar covalent bond. For a bond to be polar, there must be a difference in the electronegativities of the two

    asked on October 5, 2012
  11. Algebra

    The size of the beaver population at a national park increases at the rate of 5.1% per year. If the size of the current population is 151, find how many beavers there should be in 4 years. Use the function f(x)=151e^0.051t and round to the nearest whole

    asked on October 25, 2007
  12. Chemistry

    A rectangular solid of unknown density is 6cm long, 3cm high, and 7cm wide. The mass of this solid is 250g. Calculate the density.

    asked on September 11, 2016
  13. everglades

    Polygon ABCD is reflected and dilated to give polygon PQRS. The coordinates of the preimage are (2, 2), (6, 8), (12, 8), and (16, 2). The coordinates of the image are (11, 15), (9, 12), (6, 12), and (4, 15). What is the scale factor of the dilation? 0.25

    asked on April 15, 2015
  14. chemistry

    is IBr a hydrogen bonding or dipole-dipole interactions or dispersion forces

    asked on September 28, 2012
  15. chemistry

    Write the formulas of the compound NH4+ formed by specified cations with the following anions:OH-, NO3-, CO3-2,HSO4-, PO4-3 . Use the given order of anions

    asked on September 27, 2012
  16. Math

    Each exterior angle of a regular polygon is 15 degrees. How many sides does the polygon have? and What is the sum of the interior angles? Since this is not my area of expertise, I searched Google under the key words "polygon angles" to get these possible

    asked on April 4, 2007
  17. Chemistry

    At 700 k the equilibrium constant Kc for the reaction between NO(g) and O2(g) forming NO2(g) is 8.7*10^6. The rate constant for the reverse reaction at this temperature is 0.54 M^(-1)s^(-1). What is the value of the rate constant for the forward reaction

    asked on March 12, 2016
  18. physics

    Car A is travelling at 22.0 m/s and car B at 29.0 m/s. Car A is 300 m behind Car B when the drive of car A accelerates his car with an acceleration of2.4 m/s2. How long does it take Car A to overtake Car B?

    asked on June 27, 2015
  19. language arts

    The italicized words make up which type of verbal phrase? Turning the corner, Kate bumped into David. A. Split infinitive B. Gerund C. Infinitive D. Participial

    asked on December 23, 2013
  20. chemistry

    If the boron nitride molecule,BN, were to form, what would its structure look like? pls. need help

    asked on September 28, 2012
  21. chemistry

    Write the formulas of the compound Al+3 formed by specified cations with the following anions:OH-, NO3-, CO3-2,HSO4-, PO4-3 . Use the given order of anions

    asked on September 27, 2012
  22. math

    A raffle has a $500 first prize, two $100 second prizes and five $25 third prizes. If 500 tickets are sold for $5 each find the expected value of buying a single ticket.

    asked on July 10, 2011
  23. Chem Electron Config

    S2- Cu+ Sn2+ O2- A 1s22s22p63s23p63d10 B. 2s2 C. 1s22s22p63s23p4 D. 1s22s22p63s23p63d104s1 E. 1s2 F. 1s22s22p63s23p64s23d104p65s24d10 G. 1s22s22p63s23p64s23d104p64d105s25p2 H. 1s22s22p4 I. 1s22s22p6 J. none of the above Choose from the list the correct

    asked on October 18, 2012
  24. chemistry

    Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 {\rm hr} and is a pure gamma emitter. Suppose that 280{\rm mg} were prepared in the technetium generator this morning. How many milligrams would remain after the

    asked on September 26, 2012
  25. Math

    Find how much money there will be in the account after the given number of years. Principle $8500 Rate 4% Coumpounded quarterly Time 4 yeats A=8500(1+.04/4)raised to 40th power A=8500(1.01)raised to 40th power I am stuck here, how do you raise to the 40th

    asked on August 27, 2011
  26. math

    four diesel ships left a port at noon;january2,1953.the first ship returns to this port every 4 weeks, the second every 8, the third every 12,and the fourth every 16.when did all four ships meet again in the port?

    asked on December 4, 2008
  27. Math

    A plane is flying with an airspeed of 190 miles per hour and heading 140°. The wind currents are running at 25 miles per hour at 165° clockwise from due north. Use vectors to find the true course and ground speed of the plane. (Round your answers to the

    asked on March 2, 2020
  28. english

    what do i capitalized in this sentence.john grisham is the author of "the street lawyer".

    asked on April 23, 2013
  29. algebra

    Write a rule for the pattern. -3,-9,-14,-47,-141,.....

    asked on December 16, 2012
  30. chemistry

    What is the complete ionic equation for the double displacement reaction: CuNO3(aq) + K2S(aq)= what is the chemical name and formula of this chemical reaction? plsss. need help

    asked on October 3, 2012
  31. Chemistry

    Would you expect a chemical change to be always accompanied by a physical change? Explain?

    asked on October 3, 2012
  32. chemistry

    Reacting Mg with acid solution to form Mg salt and Hydrogen gas. What are the: 1.general reaction type 2. Chemical equation include phase 3. complete ionic equation include phase 4. chemical equation for the reaction between magnesium with water

    asked on October 3, 2012
  33. chemistry

    For each of the following bonds, indicate the positive end with \delta^{+} and the negative end with \delta^{-}. Write an arrow to show the dipole for each. 1. Si-Cl 2. Se-F 3. Br-F 4. N-H 5. N-P

    asked on September 29, 2012
  34. physics

    A tennis ball is thrown vertically upward with an initial velocity of +7.5 m/s. What will the ball’s velocity be when it returns to its starting point? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s How long will the ball take to

    asked on January 29, 2012
  35. physics

    A flowerpot falls from a window sill 25.3 m above the sidewalk. What is the velocity of the flowerpot when it strikes the ground? The acceleration of gravity is 9.81 m/s 2 . Answer in units of m/s How much time does a passerby on the sidewalk below have

    asked on January 29, 2012
  36. English

    which of the following is an example of a fragment? A) When Ted went to work, Bob went home. B) Although Ted went to work and Bob went home. C) Bob went to work although Ted went to work. D) Although Ted went to work, Bob went home. I Think the answer is

    asked on December 3, 2011
  37. physics

    What is the kinetic energy of a 20 kg dog that is running at a speed of 7.3 m/s (about 16 mi/h)?

    asked on January 27, 2011
  38. Physics

    When a pair of identical resistors is connected in series which of the following is the same for both resistors: voltage across each, power dissipated in each, current through each? What about if the resistors are different from each other?

    asked on April 15, 2008
  39. math

    Operations with scientific notation Perform the indicated operation. Each final answer must be written in scientific notation. 1. (2.34*10^5)*(-4*10^-8) 2. (4*10^3)*(4.5*10^-3) 3. (5*10^5)*(4.3*10^2)

    asked on January 17, 2008
  40. Chemistry

    The following solutions are combined in a calorimeter to determine the enthalpy of the neutralization reaction. 100.0 mL sodium hydroxide, NaOH, of unknown concentration an excess of 1.3732 M hydrochloric acid, HCl. The experimental value for q is

    asked on January 25, 2020
  41. Language arts

    how does Squeaky feel about taking care of Raymond? A) She complains about it. B) It makes her feel important. C) She ignores him. D) She feels protective of him.***

    asked on March 7, 2019
  42. math

    Justin writes the letters I-L-L-I-N-O-I-S on cards and then places the cards in a hat. What is the probability of picking an N? 8/1 7/1 1/8 1/7

    asked on March 5, 2019
  43. math 107

    Suppose you want to have $600,000 for retirement in 35 years. Your account earns 7% interest. a) How much would you need to deposit in the account each month? $ b) How much interest will you earn?

    asked on May 1, 2017
  44. math 107

    You deposit $4000 each year into an account earning 6% interest compounded annually. How much will you have in the account in 30 years?

    asked on May 1, 2017
  45. Algebra

    Can somebody please help me with solving this and show steps if they can. Solve the equation. Check for extraneous solutions. 9|9-8X|=2X+3 For my answer I got X=-1 I divided by 9 on both sides I got 8X=2X-6 Then I divided by 6 on both sides and got X=-1

    asked on November 16, 2016
  46. LA Check please

    which is the best paraphrase of these lines from "January"? Fat Snowy Footsteps Track the floor, A)Thick, snowy footprints show where animals walked B)Thick, snowy outlines of feet mark the floor ****** C)Large snow boots lie on the floor of the house D)A

    asked on January 30, 2015
  47. algebra 2

    Robert loves to dive . he joined the diving team . the diving board is feet above the water . if he jumps off the diving board as high as he can ( 10ft/s ) .how high above the water does he get ? and how long is he in mid air before he hits the water ?

    asked on January 27, 2015
  48. Chem

    Suppose that you start with 1000000 atoms of a particular radioactive isotope. how many half-lives woruld be required to reduce the number of undecayed atoms to fewer than 1000?

    asked on October 20, 2014
  49. health

    Mary Happens is an 82-year-old Hispanic patient who has been admitted to the hospital. She has Medicare and Medicaid. What demographic factors should be considered in providing this patient health care? What is the effect of culture on prevention and use

    asked on June 18, 2014
  50. Chemistry

    titration of a 50.00mL of KOH required 175.00mL of 0.0150M acetic acid, what is the Molarity of KOH solution

    asked on April 8, 2013
  51. Gen English

    In the poem Dreams by Langston Hughes, Describe how the poem is structerd,or arranged in lines and stannnzas.

    asked on April 1, 2013
  52. pre- algebra 1

    Solve the inequality. 42

    asked on November 17, 2012
  53. chemistry

    How much in $ is one MOLE of pennies?

    asked on October 9, 2012
  54. chemistry

    when two solutions are mixed and a new color is observed is this color change an indication that a chemical reaction has occurred? Explain why?

    asked on October 3, 2012
  55. chemistry

    decomposition of water to form elemental Hydrogen and Oxygen gas. What will be the balanced chemical equation, type of reaction and the driving force of the reaction?

    asked on October 3, 2012
  56. chemistry

    what is the gas formed when baking soda is added to vinegar? complete the reaction: NaHCO3(s) + CH3COOH(aq)

    asked on October 3, 2012
  57. chemistry

    Is there a gas formed if you heat a sugar? What will be its identity

    asked on October 3, 2012
  58. chemistry

    The half-life for the radioactive decay of calcium-47 is 4.5 days.If a sample has an activity of 4.00uCi after 13.5 days, what was the initial activity of the sample?

    asked on September 26, 2012
  59. chemistry

    When californium-249 is bombarded by oxygen-18, a new isotope and four neutrons are produced. Express your answer as a nuclear equation.

    asked on September 26, 2012
  60. Physics

    A person walks 13.9◦ north of east for 2.51 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? How far due east would this person walk?

    asked on September 16, 2012
  61. math

    tracy had coffee once a day, and the special blend she bought at Donna's Coffee Stop cost about $3.00 a cup. Max bought coffee at Donna's coffee stop twice a day. He bought several different types of special blends that cost $.400 a cup on average 3. Tracy

    asked on August 30, 2012
  62. Math

    Find the remainder when 13^18 + 19^12 is divided by 247.

    asked on August 2, 2012
  63. Math

    Find the units digit in 23^7777 by looking for mod 10.

    asked on August 2, 2012
  64. English

    Using the lists of possible answers, use the letters assigned to the characters/people to identify who would be the speaker of each of the following paraphrases/quotations: 1)I think we'll all be destroyed by the A-Bomb,so why should I care about anything?

    asked on December 3, 2011
  65. English

    Which of these is the properly punctuated sentence? a)Ted went to work and Bob went home. b)Ted went to work; and Bob went home. c)Ted went to work. And Bob went home d)Ted went to work, and Bob went home. Would the correct answer be D?

    asked on December 3, 2011
  66. English

    Which of the following is correct? a) We were supposed to go to the game today, but it rained. b)We were suppose to go to the game today, but it rained.

    asked on December 3, 2011
  67. English

    Which of the following is correct? a)Who's toothbrush is floating in the toilet? b)Whose going to Dairy Queen with me? c)Whose jacket is that? d)b&c I believe the answer is C

    asked on December 3, 2011
  68. algebra

    completely factor the following expression. 16a^2-40ab+25b^2

    asked on July 26, 2011
  69. intermediate algebra

    factor completely. Remember to look first for a common factor. If a polynomial is prime, state this. -4t^2+64 -(4t^2-64 =((2t)^2-8^2) (a^2-b^2)=(a+b)(a-b)

    asked on July 25, 2011
  70. algebra

    Essay. Show all work. the rectangular swimming pool is given by 2x^2-5x-3 ft.^2. One side length of the pool is given by 2x+1 feet. What is an algebraic expression for the other side length of the pool? Simplify this, and include correct units as part of

    asked on July 19, 2011
  71. Algebra II

    Solve the problem. The profit made when t units are sold, t>, is given by P²-36t+320. Determine the number of units to be sold in order for P>0 (a profit is made).

    asked on July 7, 2011
  72. Algebra

    The length of a rectangle is three times its width. If the area of the rectangle is 300cm, find its perimeter.

    asked on April 21, 2011
  73. geometry

    This is a two-column proof requiring 6 answers for each column. Given: line AB is perpendicular to line CD. Prove: m angle 2 + m angle 4 + m angle 7 = m angle 1.

    asked on September 1, 2010
  74. Business Law

    * What is the difference between lobbying and bribery? * What argument could the SLOC members make that the payments made do not fit the definition of an illegal bribe (under the FCPA)? * What do you think is the appropriate punishment for the violation of

    asked on July 23, 2010
  75. business

    as dr. andrea mogan listens to allison sanchez describe her ailments, she jots down her insights and treatment ideas. a health records specialist will later enter these _______ into allison's electronic medical record a. diagnostic reports b. medication

    asked on February 15, 2010
  76. Math 213 Elementary Math

    Use the definition of less than to show each of the following: a. 2 < 4 b. 3 < 100 c. 0 < 3

    asked on August 5, 2009
  77. can someone please help me?

    simplify the following expressions involving complex numbers. (3+2i)-(-7-i) 10 + 3i how did you do that? can you show me this one and explain how this time? (3+2i)(-7-i) or even (3-2i)^2 you would do 3+2i=5i, then -7-i=7i then 5i+7i=12i (3+2i)-(-7-i) =

    asked on January 18, 2007
  78. algerbra

    mrs. johnson is 3 times as old as her son. ten years agoe she was 5 times as old as her son was then. what is the two equations for this problem? let x = son's age and y = Mrs. Johnson's age. ============================ y=3x is one equation. 10 years ago

    asked on December 4, 2006
  79. Calculus

    Hello. I would appreciate it if someone could check my answers. I'm sorry it is so long. 1.) Let R denote the region between the curves y=x^-1 and y=x^-2 over the interval 1

    asked on September 3, 2005
  80. Chemistry

    What are the values of q, w, ΔU, ΔH, ΔS, ΔSsurr, and ΔSuniv for the following constant pressure process for a system containing 0.956 moles of CH3OH ? CH3OH(g, 122.0 ºC, 1.00 atm) ⟶ CH3OH(l, 34.0 ºC, 1.00 atm) Assume that CH3OH(g) behaves as an

    asked on February 2, 2020
  81. chemistry

    One mole of O2(g) undergoes the following change in state. O2(g, 299 K, 4.38 bar) ⟶ O2(g, 252 K, 6.79 bar) What is ΔS for the gas? Assume ideal gas behaviour. The constant pressure molar heat capacity for O2(g) is Cp,m = 29.10 J K−1 mol−1.

    asked on February 2, 2020
  82. chemistry

    A sample of gas is compressed from 12.93 L to 3.83 L using a constant external pressure of 4.89 atm. At the same time, 1,957 J of heat flows into the surroundings. What is the internal energy change for the gas?

    asked on February 1, 2020
  83. chemistry

    What is w when 3.93 kg of H2O(l), initially at 25.0 ºC, is converted into water vapour at 157 ºC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL.

    asked on February 1, 2020
  84. Chemistry

    Consider the neutralization between the following two solutions: 100.0 mL 0.9285 M hydrochloric acid, HCl 150.0 mL 1.8269 M sodium hydroxide, NaOH How many moles of water are produced by this neutralization?

    asked on January 25, 2020
  85. Social studies

    What were some influences on self-government? Select all that apply. ~Commentaries on the laws of England ~ The Columbian bill of rights ~English bill of rights ~ Poor Richards almanac

    asked on September 4, 2019
  86. Physics

    A state trooper’s car sends out a radar signal at a frequency of 14 GHz. Find the wavelength of this signal. The wave speed is 2.998 × 108 m/s. Answer in units of m

    asked on April 14, 2019
  87. statistics

    a line of regression y =-1.240 +7.07x is the best fit line for a set of data comparing airfare with 30 days notice and one-day notice. find the best-predicted cost of a ticket purchased one day in advance given that the cost of the ticket is $300 if

    asked on March 15, 2019
  88. English

    Why does Squeaky not know at first who has won the race in "Raymonds Run"? A. Raymond has climbed a fence*** B. The may pole gets in the way C. The finish is very close D. Mr. Person speaks to softly

    asked on March 7, 2019
  89. math

    find the volume of the cylinder. use 3.14 for pi the top is 34 and the bottom is 27

    asked on February 21, 2019
  90. math

    Sara needs to cover the top and sides of the cylinder below. 8 12 about how many square inches of paper will Sara need? 352 402 804 1005

    asked on February 21, 2019
  91. Managerial finance

    Your company contemplates buying a computer based inventory management system for 200 000. It will depreciated on a straight line basis to zero over its 4 year life span, when it will be sold for 30 000. the system will save the firm 60 000 pre-tax (EBIT)

    asked on August 7, 2018
  92. math

    your cellphone plan costs $24.99 per month plus $0.11 for each text message you send or receive. you have at most $28 to spend on your cellphone bill. what is the maximum number of text messages that you can send or receive next month

    asked on February 27, 2017
  93. Maths

    There are Number cards ”3”、”4”、”5” with 10 cards each ,choose any 8 cards to sum up to 31,then what is the maximum number of cards “3” in the combination?

    asked on November 11, 2016
  94. 3rd grade Math

    Allie was making a cookie recipe that called for 30 chocolate chips. She wants to make 2 batches of cookies. How many chocolate chips does she need? 1 group = 30 30+30=60 or 2x30=60 ?

    asked on October 30, 2016
  95. Algebra

    If x pounds of cashews valued at $6.00 per pound are to be mixed with y pounds of peanuts valued at $4.00 per pound to obtain a 40 pound cashew-peanut mixture. Find x and y so that when the mix is sold for $4.75 per pound, the same amount of revenue is

    asked on October 13, 2016
  96. Organic chemistry

    An unknown compound (x) melts at 60°C and is mixed with a compound (y) that melts at 45°C and is soluble in x. Will the Melting point for the mixture start below 45°? I think so, because if you look at ice and salt for an example, salt has a way higher

    asked on September 21, 2016
  97. pysical science

    An automobile with a mass of 1258 kg accelerates at a rate of 5 m/s² in the forward direction. What is the net force acting on the automobile?

    asked on May 11, 2016
  98. math

    Dan has walked 1/3 of the way to school. What fraction describes how far he still has to go? Is it 1/4,1/2,2/3,3/1

    asked on March 8, 2016
  99. Math

    Ms. Williams has 3 liters of lemonade. She wants to divide the lemonade into eight portions to give her 8 grandchildren. How can she divide the lemonade into eight equal portions

    asked on December 15, 2015
  100. math

    You are buying balloons for a pary. A small balloon cost $2. A large balloon cost $5. Write an algebraic expression for the cost of x small balloons and y large balloons. What is the answer?

    asked on November 2, 2015


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