Posts by sarah

Total # Posts: 6,129

  1. Calc. Based Physics

    10.1 Three uniform spheres with masses m1 = 6.0 kg, m2 = 2.0 kg , and m3 = 4.0 kg are fixed at the positions shown in the diagram. Assume they are completely isolated and there are no other masses nearby. m_1 | | 3cm | m_2-- P ^ | 1cm |2cm m_3 (a) What is the magnitude of the ...
  2. World History

    Choose four of the following questions to ask Moses, Jesus, and Muhammad:? Ok I choose the questions and I got the first and third one I just need help with the second and forth question •Why is the Holy Land an important site for your faith? Moses: The book of my people ...
  3. Math

    Assume the carrying capacity of the earth is 9 billion. Use the 1960s peak annual growth rate of 2.1?% and population of 3 billion to predict the base growth rate and current growth rate with a logistic model. Assume a current population of 6.8 billion. How does the predicted ...
  4. Science

    What are some ways (at least two) that cells can increase their (Unicellular and multi-cellular organisms) surface area to volume ratio without splitting into multiple cells?  One way that cells can increase their surface area to volume ratio without splitting into ...
  5. Science please help

    What are some ways (at least two) that cells can increase their (Unicellular and multi-cellular organisms) surface area to volume ratio without splitting into multiple cells? One way that cells can increase their surface area to volume ratio without splitting into multiple ...
  6. Math1

    Since the bacteria is doubling every hour, it won't be multiplying by 2. So 24 times 2 won't be the formula. Instead you would square it. doubles so 2^24.
  7. science

    What are some ways (at least two) that cells can increase their (Unicellular and multi-cellular organisms) surface area to volume ratio without splitting into multiple cells? I am having trouble finding information on the ways.
  8. Science

    For this activity, we had to make cube shaped models to represent cells. Then we had to compare surface area, volume, and surface area to volume ratio (SA:V) between the cells.  Cell A:  length of one side=1cm  Surface area= 6cm^2  Volume= 1cm^3  SA:V...
  9. Algebra

    Yup that's correct, 336
  10. Math

    Find the change in mass. So difference of 54 and 48 is 54-48 = 6 Now the original mass is 48 so you would divide 6/48 = 0.125×100=12.5 Your answer should be 12.5% I'm pretty sure
  11. science

    For this activity, we had to make cube shaped models to represent cells. Then we had to compare aurafve area, volume, and surface area to volume ratio (SA:V) between the cells. Cell A: length of one side=1cm Surface area= 6cm^2 Volume= 1cm^3 SA:V= 6 Cell B: Length of one side...
  12. Calculus

    If ln(x^2-15y)=x-5+5 and y(-4)=1 find Y prime(-4) by implicit differentiation thus the equation of the tangent line to the graph at the point (-4,1) is y=
  13. Math

    25
  14. math help

    Ms.sue may you help me? A user named Cory is keep on bothering me. Every time I post this question, Cory harasses by saying they know the answer and they aren't going to tell me. I need help with this issue and also with this math problem. Thank you for your time and effort
  15. math help

    Given f(x)=7-2x find f (x+5)   I'm not sure how to approach this problem.   I have done this so far:   F(x+5) = 7-2x   F(x+5)=7-2(x+5)   F(x+5)=7-(2x+10)   Not sure if this is right and what to do next.
  16. math

    Oh. Thank you so much! I am glad that you helped.
  17. math

    Given f(x)=7-2x find f (x+5)  I'm not sure how to approach this problem.  I have done this so far:  F(x+5) = 7-2x  F(x+5)=7-2(x+5)  F(x+5)=7-(2x+10)  Not sure if this is right and what to do next.
  18. math

    I've been trying to solve it for a ay already and decided to ask on here. May I please get help on how to do this? It'll be great and I'll appreciate if you could help.
  19. math

    Given f(x)=7-2x find f (x+5) I'm not sure how to approach this problem. I have done this so far: F(x+5) = 7-2x F(x+5)=7-2(x+5) F(x+5)=7-(2x+10) Not sure if this is right and what to do next.
  20. Chemistry

    Determine the pH of a solution after 20.00 mL of 0.4963 M HI has been titrated with 12.64 mL of 0.5174 M NaOH.
  21. Chemistry

    Consider the titration of 20.00 mL of 0.1728 M Ascorbic acid (Ka = 7.9 x 10-5) with 0.4329 M NaOH. Match the following regions in the titration curve with the appropriate pH range. 1.Initial pH 2.Before equivalence point 3.At equivalence point 4.After equivalence point A. 8 - ...
  22. Chemistry

    Determine the pH of a solution after 20.00 mL of 0.4963 M HI has been titrated with 12.64 mL of 0.5174 M NaOH.
  23. OChem

    Suppose a student obtained a 0.15g of cruse salicylic acid. How much water would be needed to just dissolve it at 75 degrees Celsius? How much salicylic acid would remain dissolved in that amount of water at just 10 degrees Celsius? What percent of the original mass of the ...
  24. English

    Should animals be tested for science research
  25. English

    that* instead of at
  26. English

    All things considered, it seems reasonable that injecting a small dosage of drugs in animals is acceptable. This practice could help to find cures for the illnesses as well as animals. Having said that people are not acknowledging the positive results of these trials. Another ...
  27. English

    It's for my argumentative essay
  28. English

    I'm not against it...
  29. English

    what percentage of animal testing is successful
  30. English

    Thanks
  31. English

    All things considered, it seems reasonable to that injecting a small dosage of drugs in animals is acceptable. This practice could help to find cures for the illnesses. Like so?
  32. English

    What do u mean by put a period after acceptable?
  33. English

    All things considered, it seems reasonable to that injecting a small dosage of drugs in animals is acceptable as this practice could help to find cures for the illnesses
  34. English

    I don't get it...
  35. English

    All things considered, it seems reasonable to accept that injecting a small dosage of drugs in animals is acceptable as it could help and improve to find cures for the illnesses. How can I improve? what words shall I remove?
  36. English

    All things considered, it seems reasonable to accept that injecting a small dosage of drugs in animals as it could help and improve of find cures for the help
  37. English

    How can I rewrite this sentence using parallel structure? The stirring closing paragraph is the formal pronouncement of independence and borrowed from the resolution of independence adopted by congress July 2, 1776.
  38. Biology

    A biologist found that 20% of a population of bats are brown, which is recessive. assuming the population shows Hardy-Weinberg equilibrium, determine the genotype and the allele frequencies of the population?
  39. Math

    Tan 57= f/70 f= 70tan 57 =107.79 tan 59 =(f+t)/70 f+t= 70 tan 69 =182.356 t=70 tan 69- f =70 tan 69 - 70tan 57 = 74.5m
  40. Physics

    The femoral artery carries blood to the leg and has a diameter of 12.5 mm. What is the resistance in a column of blood that is 2.20 cm long if the conductivity of blood is 0.630 ?-1m-1?
  41. Math

    A Gallup poll asked two questions: 1. Do you favor a tax cut or “increased spending on other government programs”? Result: 75% favored a tax cut. 2. Do you favor a tax cut or “spending to fund new retirement savings accounts, as well as increased spending on ...
  42. math

    Simplify the expression 23w^3-5w^2x+8wx^2-8w^3-13wx^2+30w^2x Group like terms so: 23w^3-8w^3= 15w^3 -5w^2x+30w^2x= 25w^2x 8wx^2-13wx^2 = -5wx^2 The final answer I got is: 15w^3+25w^2x-5wx^25wx Is this right? I had to simplify the expression.
  43. Chemistry

    When 0.010 moles of Zn(s) reacts with 30.0 mL of 1.0 M HCl, the H2 gas produced is collected in a 1.0 L flask at a temperature of 270 K. What is the pressure (atm) of H2 gas collected? Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g)
  44. Chemistry

    When 0.010 moles of Zn(s) reacts with 30.0 mL of 1.0 M HCl, the H2 gas produced is collected in a 1.0 L flask at a temperature of 270 K. What is the pressure (atm) of H2 gas collected? Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g)
  45. Physics

    An object is given two initial velocities, one that has a magnitude of 60.0 ms-1 and points along a direction that is 35.0° north of east and the other has a magnitude of 55.0 ms-1 that points 15.0°, also north of east. Determine the resultant velocity of the object.
  46. Physics

    A plane travels 3 km due north, then 5 km due northeast. Represent these two displacements graphically and determine the resultant displacement by finding is magnitude and direction.
  47. Chemistry

    2AgNO3(aq) + K2CrO4(aq) ==> Ag2CrO4(s) + 2KNO3(aq) Ag2CrO4(s) ===> 2Ag^+ CrO4^^2- Ksp = [Ag^+]^2[CrO4^2-] Ksp = (2x)^2(0.1)
  48. Chemistry

    Calculate the mass of solid AgNo3 that can be added to 2.0 L of 0.10M K2CrO4 solution in order to just start precipitation?
  49. calculus

    find y' if x^2y^4+3y-4x^3=5cos x-1 (2x*y^4)+dy/dx 4y^3*x^2)+dy/dx3+12x^2=5-sin-0 dy/dx=-5sin (x -12 x^2)/(2x*4y^3)+(12y^2+x^2) this is using implicit differenation is this correct
  50. calculus

    find y' if x^2y^4+3y-4x^3=5 cos x-1 (2x-y^4)+(dy/dx4y^3*x^) +dy/dx+12x^2=5(-sin x-1) is this started correctly
  51. Physics

    sorry, I forgot to inlcude the mass and the angle given. The mass is 10 kg and the angle is 45 degrees
  52. Physics

    The box is being pulled by a roope across a level floor as shown in the diagram. The box is accelerating at 1 m/s2, the coefficient of kinetic friction is 0.5. what is th tension in the rope?
  53. Physics

    mg sin theta - F = ma (9.8 sin 30) - 2 / (9.8 cos 30) = 0.34
  54. Physics

    you are skiing down a slope angled at 30 degrees to the horizontal. Your acceleration is 2m/s^2. what is the coefficient of kinetic friction between you and the hill?
  55. math

    Oh okay. So since there is a adding or subtracting sign with brackets, all you do is collect like terms? Okay. So it is not distributive property
  56. math

    Simplify  (5x+3)+(8x+1)  (5x)+(8x)= 13x^2  (5x)+(1)=5x  (3)+(8x)=11x  (3)+(1)=4  =13x^2+5x+11x+4  =13x^2+16x+4  Is this right or wrong? Simplify (2t^2-3t)-(7t^2-5t)  = (2t^2)-(7t^2)=-5t  = (2t^2)-(-5t)= 7t  =(-3t)-(7t^2)=-...
  57. math

    (2t^2-3t)-(7t^2-5t) = (2t^2)-(7t^2)=-5t = (2t^2)-(-5t)= 7t =(-3t)-(7t^2)=-10t =(-3t)-(-5t)=2t =-5t+7t-10t+2t I am confused. Why are all my answers "t" and none of them are "t^2"?
  58. math

    Simplify (5x+3)+(8x+1) (5x)+(8x)= 13x^2 (5x)+(1)=5x (3)+(8x)=11x (3)+(1)=4 =13x^2+5x+11x+4 =13x^2+16x+4 Is this right or wrong?
  59. Math

    A toy store has found that 30% of its customers spend more than $40 each visit. What is the probability that the next two customers will each spend more than $40?
  60. physics

    & this one... 4. A person drops 740 g rock originally held 6.5 ft above the ground. What is its velocity the moment before it hits the gound. (Assume rock doesn't gain/lose energy)... (Hint: You will need to calculate the P.E of the rock before it's dropped!
  61. physics

    Last one! Thankyou for the help thus far... calculate the KE in kJ of 9.100 x 10^5 atoms of silver moving at 1800. km/hr. ... the atoms part is what I'm confused about.
  62. physics

    I'm not sure with this conversion... getting 9.843x10^4 ft/min to m/s ? How do I get to m/s using a specification conversion without using online conversions?
  63. Physics!

    stuck on this one!
  64. Physics

    calculate K.E in Joules of a baseball w/ a mass of 237.2 cg moving at 85.00 mph
  65. Physics

    The dipole moment of a water molecule is 6.37E-30 Cm. What is the electric potential's magnitude 1.58 nm from a water molecule along the axis of the dipole?
  66. Math

    Can I please see your solution?Thanks!
  67. science

    What can people do to reduce global warming?
  68. science

    what causes clouds to form?
  69. Chemistry

    Which of the following statements cannot be assumed for the vapourization of a liquid? A)Enthalpy is positive B)Entropy is postive C)Temperature (in degrees Celcius) is positive D)They are all true
  70. Chem

    Yes
  71. Chem

    Specify the concentration of each ion in solution for the following: .10 M AlCl3 (aq) and .15 M (NH4)2SO4 (aq)
  72. Chem

    21.7 mL of 1.15 M KOH (aq) was required to titrate 25 mL of H2SO4 (aq) as follows: H2SO4 (aq) + 2KOH (aq) --arrow-- K2SO4 (aq) + 2H2) (l) What is the molarity of the H2SO4 (aq)?
  73. Chem

    Add them all together and then divide by the number of dimes. Put your answer in the ones place.
  74. Physics

    a periscope is an optical instrument made of two plane mirrors inclined at an angle 45 with respect to the axis of the tube. an observer places her eye at point O. draw the path of a ray light issued from A. determine the position and the nature of the image of A given by two ...
  75. english 101

    yes you are right bc they had drove is wrong bc drove isnot pp
  76. english 101

    no they had drove make sounds better since its a past perfect ??am I right??tnx
  77. english 101

    hi guys I need a help in my grammer class?? After throwing their sleeping bags into the backseat of their cars they-- ((had drove/drove/drivig/having driving))--more than 400 miles to reach their destination. I think driving is right.??
  78. Spanish 202

    I have some answers for my spanish class. I was hoping the grammar could be checked. Antes de estudiar esponal había dormido. Con $100000 compraría una mona. Mi passión ideal sería bombero. Comería muy mucha comida todo día. Si no ...
  79. Chemistry

    You start with 2.5L of a KNO3 stock solution and wish to prepare 10.0 L of 1.5 M KNO3. What percentage (m/v) would the potassium nitrate stock solution need to be if you were to use it all? (MW of KNO3: 101g/mole)
  80. Chemistry

    Consider a one step reaction. Which of the following does not describe the activation energy of the process? The minimum amount of energy needed for a reaction to occur The energy difference between the starting point and the transition state The energy required to distort or ...
  81. Chemistry

    Benzene (C6H6) has a normal freezing point of 5.50oC and a density of 0.88 g/mL. When 1.28 g of naphthalene (C10H8) is dissolved in 125 mL of benzene, the freezing point of the solution is 5.03oC. Determine the molal freezing point constant for this solvent.
  82. Chemistry

    Consider a one step reaction. Which of the following does not describe the activation energy of the process? The minimum amount of energy needed for a reaction to occur The energy difference between the starting point and the transition state The energy required to distort or ...
  83. math

    .20x+x=? what is ?
  84. Physics

    Which is the best example of Newton's Third Law of Motion? A hockey puck sliding on the ice will keep going until it is hit by another player or hits the wall. It takes more force to move a large tractor trailer than it does to move a small sports car. A swimmer who jumps ...
  85. Biology

    I forgot to mention that the volume of the amalyse stock is 50 ug/ml. and 2.5ml amylase stock and 2.5 ml buffer.......so i think I should take: 50ug/ml/5.0 ml = 10 The the dilution factor is 10x Is this correct do you think?
  86. Biology

    If I have 2.5 amylase stock solution, 2.5 PBS Buffer, and final amylase concentration of 25 [ug/ml] , how do you calculate the amylase dilution factor?
  87. calculus

    limx--->0 3sin 3x/4x would it be 9/4
  88. calculus

    limx-->3 sin 3x/4x
  89. Physics

    A baseball is thrown at 40 m/s. Jose Bautista hit it back in the opposite direction at a speed of 65 m/s. The ball is in contact for 1.2 ms. What distance does the ball travel while it is in contact with the bat?
  90. Math

    f(x+h)?f(x)=8hx^2+2hx+2h^2x?3h^2?4h^3. Find f?(x).
  91. MATH @Damon @ms. Sue

    Belinda wants to invest $1000. The table below shows the value of her investment under two different options for three different years: Number of years 1 2 3 Option 1 (amount in dollars) 1100 1210 1331 Option 2 (amount in dollars) 1100 1200 1300 Part A: What type of function, ...
  92. MATH @Damon @ms. Sue

    Part A:Option 1 is linear because it increased arithmetically by $110.00 a year. Option 2 is exponetial because it is increased geometrically by $1.09 a year Part B: Option 1 100x+1000 5.5x^2+93.5+1001 Option 2 100(20)+1000 2000+1000=300 Part C: After 20 years she would get $...
  93. MATH @Damon @ms. Sue

    Can Someone check my Work Belinda wants to invest $1000. The table below shows the value of her investment under two different options for three different years: Number of years 1 2 3 Option 1 (amount in dollars) 1100 1210 1331 Option 2 (amount in dollars) 1100 1200 1300 Part ...
  94. Physics

    let me try this again area formula is 1/2 x b x h 1/2 x 2.705 x 6.22 m/s = 8.4125 m is this correct? so after 11.7 seconds the particle position will be 8.4125 m?
  95. Physics

    I just saw related questions so I figured it out. (28.7/53.56)(sin 106) = 0.515 sin-1 0.515= 31.00deg 31.00deg -19deg = 12.00 deg
  96. Physics

    Two geological field teams are working in a remote area. A global positioning system (GPS) tracker at their base camp shows the location of the first team as 38 km away, 19deg north of west, and the second team as 28.7 km away, 35deg east of north. When the first team uses its...
  97. calculus

    I have a definition lim theta approaching 0 sin theta/theta = 1 so show if the limit x approaching 0 sin2x/5=2/5
  98. Physics

    A boy kicks a rock off a cliff with a speed of 15.5m/s at an angle of 53.5° above the horizontal. The rock hits the ground 5.37s after it was kicked. How high is the cliff? I found the height of the cliff which is 7.45*10^1 m. What is the speed of the rock right before it ...
  99. Chemistry

    The density of water at 60 degrees C is 0.98338 g/mL. What is the mass of 37.48 mL of water in a graduated cylinder (not including the mass of the graduated cylinder)
  100. Math

    It takes 3 mins to fill a tub to the top and five minutes to drain the full tub.if the faucet and drain are both open how long will it take to fill the tub
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