Posts by Sara

Total # Posts: 4,608

  1. math

    Two cars are side by side. One is 3.9 meters long. The other is 6% shorter. How long is the second car? I know the answer is 3.7, but how?
  2. Organic Chem

    what is the pka of anhydride? i've searched the whole web and can't seem to find the pka of the functional group.
  3. Chemistry

    Calculate molarity 9.8g r 500 ml
  4. Calculus

    Consider the functions A(x, y) = x^2y + xy ? 3xy^2, and B(x, y) = xe^xy ? y. (a) Calculate the x derivative of A, or Ax. (b) Calculate the y derivative of A, or Ay. (c) Calculate the x derivative of B, or Bx. (d) Calculate the y derivative of B, or By.
  5. math

    Christina finances a piano for $3,070 by taking out an installment loan for 24 months. The payments were $153.50 per month and the total finance charge was $614. After 14 months, Christina decided to pay off the loan. After calculating the finance charge rebate, find her loan ...
  6. math

    Scott purchases a piano costing $2,630 by taking out a 13% add-on interest installment loan. The loan requires a 15% down payment and equal monthly payments for 5 years. How much are Scott's monthly payments?
  7. math

    You purchase a hot tub costing $4,600 by taking out a 13% add-on interest installment loan. The loan requires a 15% down payment and equal monthly payments for 4 years. How much are your monthly payments?
  8. Math

    Okay so it is 1/4
  9. Math

    Given that g is the inverse function of f, and f (3) = 4 , and f ?(3) =5 , then g?(4) = -1/5 -3/5 3/5
  10. physics

    Determine the x and y components of the following three vectors in the xy plane. 1) A 19-m/s velocity vector that makes an angle of 40° counterclockwise from the -x direction. x: 2) y: Explain please!
  11. Chemistry

    hydrobromic acid (50.5) calculate the concentration in mol/L. (MW HBr: 80.91 g/mol, density: 1.49 g/mL)
  12. Computer science C++

    3. After following statements have executed, find the value of the variable a. int a=5; while (a<20) ?a=a+3; 4. After following statements have executed, find the value of the variable a. int a=0; while (a<12) ?a++; 5. After following statements have executed, find the ...
  13. Math

    Jason was hired to mow a lawn that covers an area of 2 3/4 acres it took him 4 1/8 hours to complete the job what was his unit rate and hours per acre you multiply the numerator and a complex fraction by the reciprocal of the denominator to calculate our unit rate involving ...
  14. math

    An object is dropped from a balloon 3600 feet above the ground. Find the time it takes to reach the ground if the height of the object is given by the equation h(t) = –16t^2 + 3600
  15. Math

    The length of a rectangle is three times as long as its width. Its area is 675 square feet. a. Write an equation that demonstrates the given information. b. Find the dimensions of the rectangle.
  16. history

    I think its 1 but I'm not sure
  17. history

    Which of the following best applies to religion in the High Middle Ages? 1. Pilgrimages to holy shrines declined as the practice of indulgences increased 2. The Bible was translated and widely read in the vernacular (every day, spoken) languages 3. The popular interest in ...
  18. math

    Determine whether ?QRS is a right triangle for the given vertices. Explain. Q(18, 13), R(17, –3), S(–18, 12)
  19. History

    1. In the Lindisfarne Gospels, what symbol represents St. Mark? (The Winged lion?) 2. In the Lindisfarne Gospels, who is the only evangelist who is pictured facing the reader directly? (I think its John) 3.In the Book of Kells, how many evangelists are presented as actual men...
  20. math

    Determine whether ?GHI is a right triangle. G(-2, 1), H(3, -1), I(-4, -4). Can you please show the steps too? Thank you!
  21. history

    It says that Al-Andalus is another name for the Iberian peninsula
  22. history

    is it Al-Andalus?
  23. history

    is it Reconquista?
  24. history

    Which European country was controlled by Muslims throughout the Middle Ages, and what year did Christian rulers finally take power away from the Muslims?
  25. math

    The vertices of a triangle are L(1,3), M(4,0), N(-4,1) LO is a median of the triangle. What are the coordinates of point O? Explain.
  26. math

    Thank You
  27. math

    The value of Sara's new car decreases at a rate of 8% each year. 1.Write an exponential function to model the decrease in the car's value each month. 2.Write an exponential function to model the decrease in the car's value each week. 3.Write an exponential function...
  28. English

    How to re-word this please? The Emmett Till Unsolved Civil Rights Crimes Reauthorization Act of 2016 will be considered by the House on Wednesday, December 7. under the rules. S. 2854 was proposed on April 26, 2016, by Senator. Richard Burr Republican of North Carolina and ...
  29. English

    How can I re-word this to start my summary ? On Wednesday, December 7, 2016, the House will consider S. 2854, the Emmett Till Unsolved Civil Rights Crimes Reauthorization Act of 2016, under suspension of the rules. S. 2854 was introduced on April 26, 2016, by Sen. Richard ...
  30. Math

    Give the domain and range of the following functions: f(x) = 1?4x – 7 g(x) = 3x2+ 2
  31. math

    -2/5x-9<9/10
  32. Exponential and Logarithmic functions

    Thank you
  33. Exponential and Logarithmic functions

    A certain material decays at a rate of 1.9% per year. The sample is 260 grams. How much will be left in 11 years? How long will it take to have only a 100g sample left?
  34. Opreating System

    Hi, i need help with this opreating system homework. Part 1: you need your C program to do the following in order to achieve this desired output. (1) navigate the subfolders of the proc folder looking for those folders holding information about processes in the system. ...
  35. Opreating System

    Hi, i need help with this opreating system homework. Part 1: you need your C program to do the following in order to achieve this desired output. (1) navigate the subfolders of the proc folder looking for those folders holding information about processes in the system. ...
  36. Math

    For the following geometric sequence find the recursive formula and the 5th term in the sequence. In your final answer, include all of your work. {-4, 12, -36, ...}
  37. Biology

    What is a protein that transports ions across the plasma membrane without requiring energy or changing shape?
  38. math

    i used to take that material last year ,now i forgot it, sorry
  39. math

    its more physics than math, anyways, i guess but im not sure since patrick left after 30 min, u need to add 30 min on johns arrival time.
  40. math

    sorry john
  41. math

    velocity=distance/time to find the time patrick reached
  42. psychology

    does someone know a good website that includes b.f. skinner in behavioral approach ,or just inform about him?
  43. Math! Please Help It's Due Today!!!!!

    and then you substitute the point and u'll find b then m+b=* hope im correct
  44. Math! Please Help It's Due Today!!!!!

    i used to know but now i forgot but i guess i may help you on that if two lines are perpendicular their slope product = -1 line 1:y=-5/8 x-9 a1 x a2 =-1 -5/8 x a2 =-1 a2=8/5 line2: y= 8/5 x +b
  45. MATH

    A prism has a cross section that is a right angled triangle.its volume is 60 cm^3.What could the dimensions of prism be?
  46. maths

    Aprism has a cross section that is a right angled triangle.Its volume is 6 cm^3.What could the dimentions of this prism be ? .....cmby..........cmby.....cm(2)
  47. Physics

    an object of mass m is being weighed in an elevator that is moving upward with an acceleration a. What is the eesult if the weighing is done using a spring balance and a pan balance?
  48. Math

    How would I go about solving y - 6 is greater than or equal to = 12?
  49. Math

    y + 5 is equal to or greater than 7 Is y less than or greater than 12? Please check, and help correct.
  50. Math

    x/4 + 1 = -6 I'm not sure the process to solve the equation, could I have help?
  51. physics

    If 335 g of water at 65.5 °C loses 9750 J of heat, what is the final temperature of the water? Liquid water has a specific heat of 4.18 J/(g.°C). °C (Answer a number only, no units. Round to the tenth place). This is an example of an endothermic or exothermic ...
  52. algerbra

    can someone check my work for this question? the question is to graph the function of square root of x plus 2 with the plus 2 not being in the square root my x values were 0,1, 4, 9, and 16 my y values were 2, 3, 4, 5, and 6 the next part says to write the domain and range. ...
  53. algerbra

    can someone check my work for this question? the question is to graph the function of square root of x plus 2 with the plus 2 not being in the square root my x values were 0,1, 4, 9, and 16 my y values were 2, 3, 4, 5, and 6 the next part says to write the domain and range. ...
  54. math

    yes, that's what I have. Thank you for checking my work!!
  55. math

    The question is: the table below lists the total cost for parking for a period of time on the street in NYC. The total cost for any time up to and including the hours parked. For example, parking up to and including 1 hour would cost $1.25; for 3.5 hours parking would cost $5....
  56. Algebra

    Ms. Sue, I'm sorry! I got these answers for those problems. :\ I didn't post the choices and my answers cause I thought it'd be too much work... 1. x^2 - 12x + 1 2. -4x^2 - x + 15 3. 2x^2 + x + 9 5. m^2 - 2m - 9 6. 14t- 8 9. 64^50 10. x^7 11. 4^36 12. 4^48 14. 1/27...
  57. Algebra

    I have a few of these questions that I need help on, please help me! 1. 16x^2 + 2 + 2x - 15x^2 - 1 + 14x 2. 2x^2 + 8 8 - 4x + 3x - 6x^2 + 7 3. 2x^2 = 6x - 7x +8 - 3x^2 + 1 5. (m^2 - m - 4) + (m - 5) 6. (5x^2 + x - 3) - (-2x^3 + 4) 9. 64^10/64^5 10. x^11/x^4 11. 4^3 x 4^12 12. ...
  58. math

    On the set of axes below, graph the function represented by y=cubed root of x-2 for the domain -6< or equal to x< or equal to 10. x column I did -6, 1, 2 , 3 ,10 y column I did -2, -1, 0, 1, 2 Then I plotted these points. Is this correct? Thanks for checking over my work.
  59. Math

    An employee earns $200 for 14 hours work. Assuming he is paid by the hour, how much will this employee earn in 35 hours?
  60. math

    my watch is twelve minutes slow .the bus for which I am waiting should have arrived at 3.49pm but it is five minutes late. What time would my watch show when the bus arrives?
  61. geometry

    Find the lateral area of a regular square pyramid whose slant height is 20 and whose base has an edge length of 7
  62. statistics

    Recent studies, as summarized, for example, in E. Mortensen et al. (2002). The association between duration of breastfeeding and adult intelligence. Journal of the American Medical Ass o ciation , 287 , 2365–2371, suggest that breast-feeding of infants may increase their...
  63. Math

    If <1 and <2 are supplementary, then <1 and <2 form a linear pair
  64. Math

    If <1 and <2 are supplementary, then <1 and <2 form a linear pair
  65. statistics

    The professor teaching a large introductory class gives a final exam that has alternate forms, A, B, and C. A student taking the exam using Form B is upset because she claims that Form B is much harder than Forms A and C. Discuss how percentile point data might be useful to ...
  66. math

    ok, corrected is 2x^2+4x+4x+8-4=28 2x^2+8x+4=28 2x^2 +8x-24=0 none of them still work
  67. math

    This is a multiple choice question. What is the solution of the equation 2(x+2)^2-4=28 1)2 only 2)6 only 3)-2 and 6 4)2 and -6 I did (2x+4)(2x+4)-4=28 4x^2+8x+8x+16-4=28 4x^2+16x+12=28 4x^2+16x=16 This is where I get stuck, can you help? thank you
  68. math

    thank you so I got 45.95, so approx. 46mph, which is still over the speed limit. Thank you for taking the time to check my long involved problem.
  69. math

    The equation d=0.12v^2 + 2.1v models the distance d in feet it takes a car traveling at a speed of v miles per hour to come to a complete stop. Graces car was able to stop after 350ft on a highway. If the speed limit in the area was 35 miles per hour, was she speeding? Justify...
  70. Math

    Michael can travel at 166.35mph in his Ferrari. How far can he travel in 5 hours?
  71. Math

    Colin lived in Scotland and was going to take his caravan on holiday to France. On the first day he travelled 472.87 miles to Portsmouth. He got a ferry which travelled 73.92 miles. He then got off the ferry and drove 134.56 miles to the camp site. How far did Colin travel to ...
  72. 9th grade English

    Thank-you. I guess I shouldn't complain but I want to challenge myself
  73. 9th grade English

    Sam had to mix __________ parts of the two chemicals for the experiment. a. equaled b. equitably c. equal d. equate f. equation I pick C This seems to easy am I missing something?
  74. Story section

    Imagine you are an old ragged doll.You have just been thrown away by your owner.Tell the story of what happens to you. Please at least write 4 or 5 sentences to make a start Thank you
  75. Logic

    Thanks
  76. Logic

    Which of the following is not like the others? A. 1 B. 22 C. -2 D. 50 E. -94
  77. Logic

    Thank you
  78. Logic

    Which of the following is not like the others? A. Mars B. Venus C. Asparagus D. Potatoes E. Computers F. Cheeses G. Chairs H. Pasta
  79. Maths

    A boy spends 1/4 of his money on sweets and 1/3 on computer games. What fraction of his money does he not spend?
  80. Trigonometry

    The first three terms of an arithmetic progression are 1/2, x, 25. The first three terms of a geometric progression are x+1/4, 32 1/2, and y, where x and y are positive numbers. Find the value of X and the value of Y.
  81. MATH

    Jenny is running an experiment for organic chemistry class. She needs exactly 100 ml of 70% hydrochloric acid, but the lab only has 90% and 40% solutions. How much of each solutions does she need to mix in order to obtain 100 ml of 70% hydrochloric acid solution?
  82. Math

    What is 7 to the nearest hundred?
  83. MATH!!

    There are two numbers whose sum is 50. Three times the first is 5 more than twice the second. What are the numbers?
  84. math

    15(5^x-2)=8^2x+1 extraneous root sorry for the re post, i typed it wrong
  85. math

    given f(x) = x^2 and g(x)= squar root x+4. determine the following compostions and their doamin and range a) f(g(x)) b) g-1(superscript) (f(x)) c) g(f(x)) +g-1(superscript)(f(x))
  86. math

    log(subscript)2 (x+5) + log(subscript)2 (x-1) =4 find the extraneous root
  87. math

    The pH or acidity of liquid is measured in pH, where pH is given by the equation pH=- log C, with C being the concentration of [H+] in multiples of M=1mol/L. Suppose you are given a solution of hydrochloric acid with a pH of 1.7 and asked to increase the pH solution by 1.4. ...
  88. math

    opss i typed it wrong 15(5^x-2)=8^2x+1
  89. math

    15(5x-2)=82x+1 solve the extraneous root
  90. math

    A polynomial function function is defined by the equation p(x)=3x3+ax2+bx+7, where a, bE/. If p(-2)=5 and p(1)=14 then the value of a+b is...
  91. Advanced Functions

    4cos2x - cosx-3 =0 0 to 2pi
  92. chemistry

    The pH or acidity of liquid is measured in pH, where pH is given by the equation pH=- log C, with C being the concentration of [H+] in multiples of M=1mol/L. Suppose you are given a solution of hydrochloric acid with a pH of 1.7 and asked to increase the pH solution by 1.4. ...
  93. Advanced Functions

    the compound interst forumla is A= P(1+i)^n. consider the function in the form of y= 100(1+x/2)^20, where y is the compound amount. a) determine the required annual interest rate of investment to the nearest tenth of a percentage of 10 years that will give an amount of $300 b...
  94. statistics

    the percentage increase in price of four items from what they did a year earlier is 72,108,36 and 96 what is the average percentage increase in price of the four items
  95. physics

    suppose a car is driven from town A to town B from town B to town C and from town C to town D which have equal distances at average speeds 20km/hr,60km/hr and 120km/hr respectively,what is the average speed for the whole journey
  96. Advanced Functions

    assume the function f(x) and its inverse f-1(x) are both defined for xer. give a geometric interpretation of the composite function y=f(f-1(x))
  97. Percentage

    If Safia have 10 percent more cookies than Rohit, how many percent fewer cookies does Rohit have than Safia?
  98. help math!

    Elisabeti bikes from home to the grocery store and back to pick up in- gredients. On the way to the store, she averages 15 mph. Encumbered by groceries, she averages 10 mph on the way back. What is her average speed for the whole hour?
  99. help with math!

    Morwen bikes around his neighborhood for an hour. He averages 15 mph for the first 40 minutes, but then he tires and averages 10 mph for the last 20 minutes. What is is his average speed for the whole hour?
  100. MATH 2

    Elisabeti bikes from home to the grocery store and back to pick up in- gredients. On the way to the store, she averages 15 mph. Encumbered by groceries, she averages 10 mph on the way back. What is her average speed for the whole hour?