Most popular questions and responses by sonia
  1. Trig

    From two different tracking stations, a weather balloon is spotted from two angles of elevation, 57degrees and 83 degrees, respectively. The tracking stations are 15 km apart. Find that altitude of the balloon. Any help given will be greatly appriciated

    asked on July 20, 2010
  2. Trig

    a sailor out in a lake sees two likght houses 11km apart along the shore and gets bearings of 285degrees from his present position for light house A and 237degrees for light house B. From light house B, light house A has a bearing of 45degrees. How far to

    asked on July 21, 2010
  3. calculus

    A fence 5 feet tall runs parallel to a tall building at a distance of 3 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?

    asked on November 21, 2012
  4. math

    Paul has grades of 73 and 86 on his first two tests. What must he score on his third test in order to have an average of at least 70?

    asked on September 6, 2011
  5. physics urgent

    A 1.5 m tall man stands 2 m in front of a flat wall mirror. Please find: image distance and height of image I have the formulas but i don't know how to solve this without the focal point or a radius...pls help!!!!!!!

    asked on December 10, 2011
  6. english iii

    why did john choose the room in the yellow wallpaper?

    asked on March 10, 2013
  7. Clothing and Textiles

    What are thedifferent methods of controlling fullness in a garment. Need pictures

    asked on March 28, 2011
  8. maths

    THE Perimeter of a triangle is 2004. One Side of a triangle = 21 Times the other. the shortest side is integral length. SOLVE For lengths of the sides of the traingle in every possible case.

    asked on December 31, 2012
  9. Chem H

    How do you write a balanced net ionic equation for the reaction Cr2(SO4)3(aq)+(NH4)2(CO3)(aq)?

    asked on December 12, 2010
  10. math

    Find the volume of the solid formed by rotating the region enclosed by y=e^4x+3 y=0 x=0 x=0.7 this is my work V = ∫ e^4x dx {between x=0 and x=0.7} = 1/4 e^4x {between x=0 and x=0.7} = 1/4 (e^2.8 - e^0) = 1/4 (e^2.8 - 1) however i am etting the wrong

    asked on October 29, 2009
  11. math

    walkie talkie phone company charges $18.00 for basic phone service per month and $0.15 per minute for long distance calls. Arena calls charges $80.00 per month with no fee for long distance calls. For what number of minutes of long distance calls is the

    asked on August 10, 2013
  12. maths

    using a scale of 1:250 draw an accurate plan of a rectangular garden measuring 25m x 15m.

    asked on September 17, 2016
  13. Literature

    What words and comparisons emphasize Achilles' speed? (question from the iliad)

    asked on August 27, 2007
  14. urgent physics

    A power line carries a current of 110 A at a location where the Earth's magnetic field has a magnitude of 0.37 Gauss (0.37·10-4 T) and points due north, very nearly parallel to the ground. Find the direction and magnitude of the magnetic force exerted on

    asked on November 4, 2011
  15. physics

    A point charge of -8.4 µC is at the origin. a)What is the electric potential due to this charge at (x,y) = (3.5 m, 0 m) b) What is the electric potential due to this charge at (x,y) = (-3.5 m, 0 m) c) What is the electric potential to this charge at (x,y)

    asked on September 16, 2011
  16. math

    The temperature has been going down at a constant rate. In 8 hours it went down 16 degrees. Which expression best shows the temperature change each hour?

    asked on October 3, 2016
  17. Trignometry

    A calculator is broken so that the only keys that still work are the \sin, \cos, \tan, \cot, \sin^{-1}, \cos^{-1}, and \tan^{-1} buttons. The display initially shows 0. In this problem, we will prove that given any positive rational number q, show that

    asked on May 4, 2014
  18. GEOMETRY 4.6

    USE THE GIVEN SET OF POINTS TO PROVE EACH CONGRUENCE STATEMENT E(-3, 3), F(-1, 3), G(-2, 0), J(0, -1), K(2,-1), L(1, 2);

    asked on August 9, 2010
  19. Math

    The temperature was less than 32 degrees Fahrenheit

    asked on November 1, 2018
  20. Trig

    A sail boat on lake Huron leaves Southampton and sails 20degrees west of north of 20km. At the same time, a fishing boat leaves Southampton and sails 30degrees west of south for 15 km. At this point, hot far apart are the boats, to the nearest metre? ( the

    asked on July 21, 2010
  21. Physics

    I have been working on this homework question for a bit, but I just can't get it. Please help me! Where must an object be placed with respect to a convex lens (f=20cm) to generate an upright image that is 4 times as large as the object? 10 cm in front 10

    asked on April 25, 2011
  22. physics

    Four light bulbs (A, B, C, D) are connected together in a circuit of unknown arrangement. When each bulb is removed one at a time (and subsequently replaced), the following behavior is observed while it is removed: A B C D A rem * on on on B rem on * on

    asked on September 30, 2011


    asked on September 14, 2009
  24. physics

    i need help figuring out what formaula to use for finding the final velocity of a rocket. Model rocket engines are sized by thrust, thrust duration, and total impulse, among other characteristics. A size C5 model rocket engine has an average thrust of 5.26

    asked on October 7, 2008
  25. chem

    what mass of zinc will be required to react completely with 100cm3 of a 1.0M hcl.

    asked on January 17, 2016
  26. MDM4UO

    A teacher provides pizza for his class if they earn an a average on any test the proability of the class getting an A average on one of his test is 8% What is the probability that the class will not earn a pizza for the firt seven tests? Answer is 0.5578

    asked on April 3, 2011

    The fishing pole below (F = 94 N , = 1.90 m) makes an angle of 20.0° with the horizontal. What is the torque exerted by the fish about an axis perpendicular to the page and passing through the fisher's hand? i TRIED doing fdsinthetha=(1.90*94*sin20) this

    asked on November 10, 2008
  28. physics

    A particle has an initial horizontal velocity of 2.9 m/s and an initial upward velocity of 4.5 m/s. It is then given a horizontal accelera- tion of 1.2 m/s2 and a downward acceleration of 1.2 m/s2. What is its speed after 4.9 s? Answer in units of m/s

    asked on October 25, 2012
  29. Please Please Help-Physics

    I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North

    asked on March 16, 2011
  30. econ

    Consider the following data about the goods market in a hypothetical closed economy. Assume that government expenditure is constant at $200 million. Also assume that there is equilibrium in the goods market at all times. Some of the pairs of interest rate

    asked on March 14, 2010
  31. econ

    Consider the following data about the goods market in a hypothetical closed economy. Assume that government expenditure is constant at $200 million. Also assume that there is equilibrium in the goods market at all times. Some of the pairs of interest rate

    asked on March 14, 2010
  32. Physics

    If a body of weight 10N is lifted from the floor to a table 2m above the floor, calculate the potential energy gained by the body

    asked on April 11, 2019
  33. physics

    A young woman named Kathy Kool buys a sports car that can accelerate at the rate of 4.16 m/s2. She decides to test the car by drag racing with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 0.58 s before

    asked on October 13, 2012
  34. Statistics

    Three cards are drawn with replacement from a standard deck. What is the probability that the first card will be a spade, the second card will be a black card, and the third card will be a queen? Write your answer as a fraction or a decimal number rounded

    asked on June 22, 2012
  35. geometry

    Given two spheres, if the volume of the first sphere is 36r, and the volume of the second sphere is 288r, what is the relation of the second radius to the first radius?

    asked on August 1, 2011
  36. Math

    Charlene takes the bus to work in the morning then walks home for lunch walks back to work and finally walks home in the evening the distance one way is 600 meters how far does she walk each day between home and work

    asked on January 11, 2018
  37. PoE

    Turner’s treadmill starts with a velocity of −1.9 m/s and speeds up at regular intervals during a half-hour workout.After 36 min, the treadmill has a velocity of −7.6 m/s. What is the average acceleration of the treadmill during this period? Answer

    asked on October 7, 2012
  38. econ

    Suppose you inherit $10,000 and decide to use the money to start a lawn-care business. You purchase a truck and a mower for $10,000 and start mowing lawns. Your annual cost for fuel and other supplies is $2,000. Now, instead of investing your money in the

    asked on April 9, 2010
  39. Govt. accounting

    The following information relates to Dell City, whose first fiscal year ended December 31, 2006. Assume Dell has only the long-term debt specified in the information and only the funds necessitated by the information. 1. General fund: • The following

    asked on March 22, 2008
  40. statistic

    1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has a normal distribution, the mean and the median are not equal.

    asked on August 24, 2011
  41. Organic chem

    When you react 1-octene wih borane tetrahydrofuran solution and hydrogen peroxided over NaOH and water... (hydroboration- oxidation reaction) how do you run the reaction differently to improve the yield of the major product 1-octanol?

    asked on November 4, 2009
  42. physics

    A man jogs at a speed of 1.7 m/s. His dog waits 1.4 s and then takes off running at a speed of 3.4 m/s to catch the man. How far will they have each traveled when the dog catches up with the man? Answer in units of m

    asked on September 30, 2012
  43. statistic

    Using the 68-95-99.7 rule: Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: a. Percentage of scores less than 100 b. Relative frequency of

    asked on August 24, 2011
  44. physics

    a piece of iron has a temperature of 18 degrees celsius. A second identical piece of iron is twice as hot. What is the temperature of the second piece of iron? Please explain why.

    asked on December 13, 2010
  45. geometry

    ABCD is a square with area =625 in square. The circumfrence centered in circle is circunscribed by ABCD. Find the approximately value of the shaded area. Use pie = 3.14

    asked on May 20, 2010
  46. math

    if you do a job in 4 hours, and your friend can do the same job but in 6 hours, and if you both work together how long will it take to complete the job?

    asked on September 6, 2008
  47. math

    After Khalil gave Benjamin 3/5 of the rocks in his collection, Benjamin had 70 rocks. If Benjamin had 25 rocks in the beginning, how many rocks did Khalil have in the beginning?

    asked on January 28, 2015
  48. math

    there are 36 carpenters in a crew. on a certain day, 29 were present. what percent showed up for work?

    asked on August 10, 2013
  49. calculus

    A fence 5 feet tall runs parallel to a tall building at a distance of 3 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?

    asked on November 21, 2012
  50. Algebra 1

    Can someone tell me the x- and y- intercepts of: x+y=9 Explain how you got the answer please.

    asked on February 8, 2012
  51. physics urgent!

    The magnetic field in the region shown below is increasing by 5 T/s. The circuit shown (with R=25 , C=55 µF, dimensions 1 m by 2 m) is inserted into the region as shown. The capacitor is initially uncharged. 1. What is the current in the circuit at the

    asked on November 12, 2011
  52. physics

    A transformer with 360 turns in its primary coil and 18 turns in its secondary coil is designed to delivered an average power of 1400 W with a maximum voltage of 60 V. What is the maximum current in the primary coil?

    asked on August 3, 2011
  53. help please

    if you are printing an essay on the comuter....can the essay be double line space?

    asked on April 15, 2011
  54. math

    a dailly farmer produce 50 tons of rice in the first day, 57 tons in the second day, and 64 tons in the third day. the production continue to increase in the same manner up to the 28 day. what is the a) production of the farmer on the 28 day? b) what is

    asked on November 2, 2010
  55. algebra

    solve by substitution, 9x+2y=-64

    asked on October 29, 2009
  56. econ

    1) during last year a company went through $800,000 worth of net loss. yet its cash increased 300,000 during the same period of time. How could this occur. Please help confused!

    asked on October 21, 2009
  57. calc

    The equation of the tangent line to y=f(x) at a=2 can be written in the form y=mx+b where f(x) =4sinx/4sinx+6cosx i already got 3/2 for m but i cant seem to find out how to get the value of b?

    asked on May 9, 2008
  58. math

    What is divisor. Dividend quotient

    asked on April 10, 2008
  59. math

    The ratio of Jane's number of soda to Pat's number of soda is 2 to 3. If Jane has 16 cans of soda, how many cans of soda does Pat have?

    asked on January 21, 2015
  60. physics

    A bomber flies horizontally with a speed of 225 m/s relative to the ground. The altitude of the bomber is 3010 m and the terrain is level. Neglect the effects of air resistance. The acceleration of gravity is 9.8 m/s2 . a) How far from the point vertically

    asked on October 25, 2012
  61. Science- Chemistry

    A test tube containing a mixture of compounds X, Y, and a small amount of Z weighs 25.4886 g. The tube is emptied into a beaker and the empty tube is reweighed, giving a value of 10.2586 g. The mixture is separated into two components by dissolving in

    asked on October 13, 2012
  62. math

    identify the property that it shown. 2*8*5=2*5*8

    asked on February 22, 2012
  63. math

    tickets to a school play cost 1.5 in advance and 2.0 at gate. by selling all 200 tickets students got $360. how many tickets did they sell in advance?

    asked on January 29, 2012
  64. math

    write the place name for the 4 in the following number 3 624 786

    asked on May 3, 2011
  65. Phys 2

    I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North

    asked on March 16, 2011
  66. English

    in a paragraph......details grow out of the major details and also give information about..... details. what are the best suitable words for these two blanks?

    asked on November 5, 2010
  67. math

    a man saved a sum of 200 dinars in the first month, 250 in the second month, 300 in the third month and he continue to save at the streght. after how many month can he buy a radio instronment coastin 13500 dinars

    asked on November 2, 2010
  68. econ

    If i were to do a simple supply and demand curve for subprime mortagages I know I would do the supply as increasing but what happens to the demand would I say the demand for these mortagages also increased causing the price to say the same I feel as though

    asked on August 5, 2009
  69. math

    Consider the function f(x)=10sqrrootx+5 on the interval [3,10]. i found the average slope to be 2.043181217 By the Mean Value Theorem, we know there exists a c in the open interval (3,10) such that f'(c) is equal to this mean slope i tried tking the first

    asked on May 6, 2009
  70. music

    I am still on to the four seasons oh by the way thanks to miss sue your a star!But I have a lot of infomation on vivaldi not the 4 seasons,and thanks for taking the time to help!

    asked on April 2, 2008
  71. algebra

    i have a problem in dis sum from complex numbers prove that (1+sinA+icosA)/(1-sinA-icosA)=i(secA+tanA)

    asked on April 1, 2008
  72. Geography

    What government imposed barriers stop or hinder the export of automobiles?

    asked on February 26, 2007
  73. chemistry

    calculate the weight in grams far a given solution of sodium thiosulphate crystals of strength 2.0M

    asked on January 21, 2016
  74. chemistry

    What mass of NaHCO3 must be added to 100ml H2O to produce a solution with a pH of 10? K1(H2CO3)=4,6*10^-7 K2(H2CO3)=4,4*10^-11 -------- Help! Thank you

    asked on January 7, 2016
  75. math

    the elevation of a tower from a point on the ground is 30 at a point on the horizontal line passing through the foot of the tower and 100 metres nearer it, the angle of elevation is 60 find height of the tower and the distance of the first point from the

    asked on September 6, 2015
  76. maths

    Fuel wood logs sawed 53 times and 72 pieces made. If the cutter saw only one at a time how many there were before cutting?

    asked on May 21, 2015
  77. math

    Estimate 5/30 as a percentage.

    asked on February 5, 2015
  78. math

    Alex's car takes 10 gallons of gas for 20.10 miles. If Shon's car uses 3/10 the amount of gas as Alex's car to travelled, what is the mileage for each person's car? How man gallons of gas would each need to travel 4.5 miles?

    asked on December 10, 2014
  79. Quantum Physics

    What is the probability current density of a particle with wavefunction ψ(x,t)=exp(iℏ(px−Et))?

    asked on October 21, 2013
  80. To Reiny, math helper

    can you look at my post, its just 4 math terms I need to figure out, please help

    asked on September 18, 2013
  81. Math definitions

    a number that can be expressed as the product of 3 equal factors? a number that can be expressed as the product of 2 equal factors product of 1 and a radical product of a rational number and a radical

    asked on September 18, 2013
  82. math

    find the radius and height of a cylindrical soda can with a volume of 21in^3 that minimize the surface area.

    asked on April 28, 2013
  83. math

    verify that the function satisfies the hypotheses of the mean values theorem on the given interval. then find all numbers c in the given interval that satisfy the conclusion of the mean value theorem. f(x)=2x/x4 [0,3]

    asked on April 28, 2013
  84. physics

    A car starts from rest and travels for 5.9 s with a uniform acceleration of +3.0 m/s2. The driver then applies the brakes, causing a uniform deceleration of 1.3 m/s2. If the brakes are applied for 2.1 s, how fast is the car going at the end of the braking

    asked on October 7, 2012
  85. health safety and nutrition of young child

    could u please give answers for exam 40553400. i,m not sure about my answers

    asked on October 19, 2011
  86. child care

    in preparing budget for a day care center, you must plan for an amployer you must pay part of employees which tax

    asked on October 18, 2011
  87. Statistic

    Indicate whether the given statement could apply to the data set consisting of 1000 values that are all different. 1. The 29% is greater then the 30 th percentile. 2. The median is greater then the first quartile. 3. The third quartile is greater then the

    asked on August 20, 2011
  88. Pre-algebra

    0.2297=(1/x^2-1/49) I don't get how to solve for x. Pls help stuck on a problem

    asked on June 19, 2011
  89. math

    the first term of an arthmetic progression is 1 and its last term is 28, find the sum of the progression if their number is 10

    asked on November 1, 2010
  90. positive psychology

    Week 2: Online Presentation: “Tutorials & Guides-1” - Due Date: Day 3 [post to the Main forum] This week you will chose a topic from the Online Presentation Guidelines and follow the directions there. Use the PowerPoint presentation as a guide. Be sure

    asked on October 5, 2010
  91. cacl

    integral of x^3+65/X^+7x+12 dx when i solved i got x^2/2-7x+64ln(x+4)-111ln(x+3)+c however this isn't the right answer....what have i done wrong??

    asked on December 2, 2009
  92. microecon

    Our professor gave us a exercise to do for fun where he said to derive profit=PQ(P,A)-C(Q(A))-A (note Q is a function of A both for revenue and cost) the answer I came up with is profit= Pdq/da -Cqfq/da-1 =Pdq/da -(d+c/dq)(dq/da) Im not sure if I am right

    asked on November 30, 2009
  93. econ

    My professor asked to take the derivative of profit for fun so I just wanted to check if my answer was right. profit=PQ(p,a)-c(q(a))-a dΠ/dQ = -2bQ + (a-c) ≡ 0. Thus, -2bQ = -(a-c) and Q = (a-c)/2b.

    asked on November 23, 2009
  94. cacl

    cos(t)/(5sin(t)+8)^2 the answer i got was: xcos(t)/(5sin(t)+8)^2 this is not right when i put it in what did i do wrong?

    asked on November 19, 2009
  95. math

    Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. y=1/x^2 y=0 x=4 x=7; about y=–3 i integrated and plugged in values for x and got .61 *pi this is not the right answer been trying for hours

    asked on October 23, 2009
  96. algebra

    In 1990, the life expectancy of males in a certain country was 66.3 years. In 1997, it was 70.0 years. Let E represent the life expectancy in years t and let t represent the number of years since 1990. E(t)= ___t +____ round to the nearest tenth. Use the

    asked on October 22, 2009
  97. college algebra

    y=-10x+5 m= what. I came up with 5 am I close

    asked on October 8, 2009
  98. Math

    How do I multiply fractions with different denominators? Do I always do cross multiplication? EX: Xy, when X = -5/16 and y = 7/15. 2. How do I write 12/5 as a whole number?

    asked on September 27, 2009
  99. indefinite integrals

    integral from 1 to 0 dx/x^1/2 i am unsure on how to even start would the limit still go to infintiy?

    asked on August 27, 2009
  100. math

    y=x^2e^x I am suppose to find the dy/dx of this the way i did it was x^2e^x times dy/dx of x^2 and got x^2e^x times 3x^2 this is not right and im confused on how to solve it help pls.

    asked on August 12, 2009


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