# Jenn

Most popular questions and responses by Jenn
1. ## Geometry Question

B is the midpoint of segment AC and D is the midpoint of segment CE. Solve for x, given BD=3x+5 and AE=4x+20. Sorry I couldn't get the link for the picture but, the diagram is a picture of a triangle with a C at the top, and A and E on the bottom angles,

2. ## social studies

How did communist and nationalist forces influence China? Select all that apply. A. They encouraged the opening of China to foreign trade. B. They caused political conflict and civil war. C. They worked together to overthrow China's last imperial dynasty.

39. ## Statistic

test consists of 10 multiple choice questions with five choices for each question. As an experiment, you GUESS on each and every answer without even reading the questions. What is the probability of getting exactly 7 questions correct on this test?

40. ## chem question i need help

I need help on this question. Could someone give me tips on how to solve it? thanks An emergency breathing apparatus often placed in mines works via the following chemical reaction: 4KO2(s) + 2CO2(g) to make 2K2CO3(s) + O2(g) If the oxygen supply becomes

41. ## Chemistry

If a sample of silver carbonate contains 1.75 grams of silver [Ag] atoms, calculate the mass (in grams) it contains of oxygen atoms [O].

42. ## Gases - van der waals

It turns out that the van der Waals constant b equals four times the total volume actually occupied by the molecules of a mole of gas. Using this figure, calculate the fraction of volume in a container actually ocupied by Ar atoms (a) at STP, (b) at 100

43. ## Bus 311

1. Petra contracted to paint Bret’s house for $2,000. After beginning the job, Petra realizes that the house is really quite big, and she’s not going to make enough profit, so she tells Bret she wants another$500 to finish the job. Bret doesn’t want

44. ## physics

A force in the +y direction applied at the point x=2.3m,y=1.4m gives rise to a torque of 39n*m about the origin. Find the magnitude of the force.

45. ## Chemisty

N2+3H2=2NH3 Assume 0.150 mol of N2 and 0.477 mol of H2 are present initially. After complete reaction, how many moles of ammonia are produced?

46. ## calculus

If a bone is found to have 20% of its normal amount of carbon 14, how old is the bone?

47. ## Physics

1580 kg car is traveling with speed of 15 m/s. What is magnitude of horizontal net force that's required to bring the car to a stop in 50 m?

48. ## calculus

If a bone is found to have 20% of its normal amount of carbon 14, how old is the bone?

49. ## math

When simplifying a rational fraction, why do you need to factor the numerator and the denominator? Include two examples! to get like terms Can you explain a little more? When you factor then you can cancel like terms Example: 12/3 (3)(4) ------- = 4/1 =4 3

50. ## english

What format does “forest fire” by Anais Nin use? example: compare-and-contrast

51. ## organic chemistry

An optical rotation study gives a result of +140 degrees. Suggest a dilution experiment to test whether the result is indeed +140 degrees, not -220 degrees.

52. ## Compenstion & Benefits

what methods do employers actually use to gauge their employees' evaluation of benefit packages?

53. ## Physics

Four penguins are being pulled along very slippery (frictionless) ice by a curator. The masses of the three penguins are given below and so are two of the tensions. Find the penguin mass that is not given. 12kg---Unknown--111N--15kg---20kg--222N After

54. ## statistics

The sample mean for a recent introductory psychology test was 78, and the sample variance was 9. If a student received a score of 82, what was this student’s z-score?

55. ## geometry

On a number line, point A has coordinate 5, and point D is on the line such that AD = 8. What are two possible coordinates of point D?

56. ## Science

trying to lift an 8-N load that is attached to a fixed 2 pulley system. Hands move a distance of 1.6m while the load moves 0.8m, what is the force required to lift the load? I am thinking the the answer is 1.6 divided by 0.8 am i on the right track? what

57. ## Physics

A ball is thrown upward from the top of a 24.6 m tall building. The ball's initial speed is 12 m/s. At the same instant, a person is running on the ground at a distance of 31.2 m from the building. What must be the average speed of the person if he is to

58. ## MORE MATH

What is the factoring by grouping? When factoring a trinomial, why is it necessary to write the trinomials in four terms? I will be happy to critique your thinking on this. I do not understand to even answer it? How do we determine the common factors in an

59. ## math

if there are 19 boys and 24 girls in the math class. 10 boys and 15 girls are freshman. if you randomly choose a student, what is the probability that it will be a girl or freshman?

60. ## english

how does carbon dioxide affect the ocean?

61. ## Math

A survey reported that out of 50 teenagers, 9 said they get their news from a newspaper. At this rate, how many out of 300 teenagers would you expect to get their news from a newspaper?

62. ## Chemistry

Will Zinc react with Zn(NO3)2, Cu(NO3)2,Pb(NO3)2, Mg(NO3)2, AgNO3, Al(NO3)3, or Fe(NO3)3

63. ## Physics

A person weighing 900 Newtons is standing on snowshoes. Each snowshoe has an area of 2500cm^2. What is the pressure on the snow?

64. ## Trig

19pi/7 Which quadrant does the terminal side lie on?

65. ## Chemistry!!!~!!

A solution of sodium chloride in water has a vapor pressure of 18.5 torr at 25°C. What is the mole fraction of NaCl in this solution? What would be the vapor pressure of this solution at 48°C? The vapor pressure of pure water is 23.8 torr at 25°C and

66. ## english

what does this quote mean: never underestimate the power of stupid people in large groups please help!

67. ## Chemistry

A 495-mL sample of unknown HCl solution reacts completely with Na2CO3 to form 18.1g CO2. What was the concentration of the HCl solution?

68. ## algebra

Define a variable and write an inequality. Then solve. A local summer baseball team plays 20 games each season. So far, they have won 9 games and lost 2. How many more games must they win this season to win at least 75% of all their games?

69. ## statistics

Describe whether the following study would most likely be “observational” or “experimental”, and why it would be so. A survey examines the preferences for laundry detergent. ***The admissions office wants to estimate the cost of textbooks for

70. ## algebra

Dal and kim can assemble a swing set in 1.5 hours. working alone it takes kim 4 hour longer than dal how long will it take dal alone to assemble the swing set

71. ## cognitive and langauge del.

Dr bean believes that lanaguage development ia a product of inner predispositions and environmental influences Dr Beans belief is consistant with WHAT? perspective behaviorist nativist interactionist psychoanalyticl

72. ## french

what is rinétede, ropterég and miénocoser? plz anser! thx :)

73. ## Physics

Rollercoaster has a dip that bottoms out in a vertical circle of radius r. Passenger feels seat of car pushing upward on her with a force twice her weight as she goes through the dip. If r = 20.0 m, how fast is rollercoaster going at bottom of the dip?

74. ## statistics probability

Assume that the thermometer readings are normally distributed with a mean of 0 degrees C and a standard deviation of 1.00 degrees C. A thermometer is randomly selected and tested. The probability of getting a reading between -1.39 degrees C and 1.69

75. ## chemistry

What is the specific heat of a metal if 24.8 g absorbs 65.7 cal of energy and the temperature rises from 20.2 degrees celsius to 24.5 degrees celsius?

76. ## stats

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: Suggest you make a drawing and label first… a. Percentage of

77. ## Physics

Two ants race across a table 76 cm long. One travels at 5.2 cm/s and the other at 2 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm. Can you teach me how to do this plz?

78. ## algebra

a squirrel can run at a speed of 20 miles per hour. How many feet per second is this?

79. ## geometry

if the measurement of angle fgk is 3y-4 and measurement of angle kgh is 2y+7 find x

80. ## College algebra!

For the linear function f(x) = 5x + 3 (a) Determine the slope and y-intercept (b) Use the slope and y-intercept to graph the linear function. (c) Determine the average rate of change of the function (d) Determine whether the linear function is increasing,

81. ## physics

A 50 kg uniform ladder, 5.0 m long, is placed against a smooth wall at a height of h = 3.7 m. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction is 0.40. An 80 kg block is suspended from the top rung of the

82. ## writing

Are the following properly referenced in APA format? And if not please fix them accordingly. American Psychiatric Association(2000) Diagnostic and Statistical Manual of MentalDisorders DSM-IV-TR. Barkley R.A. (2006) Attention-Deficit Hyperactivity

83. ## Math

If you are dealt a 5-card hand from a standard deck of 52 playing cards, what is the probability (rounded to 6 decimal places) that you are dealt at least 4 hearts?

84. ## math

The ratio of yellow paint to blue paint is 3 quarts to make the color green to paint my bathroom. I need a total of quarts of yellow paint. How many quarts of blue paints I need?

85. ## physics

A 5.8 g bullet leaves the muzzle of a rifle with a speed of 306 m/s. What total constant force is exerted on the bullet while it is traveling down the 0.75 m long barrel of the rifle?

86. ## physics

two equal mass cars collide head to tail and their bumpers lock. One car has a velocity of 10m/s and the other is at rest. what is the velocity of the two cars after the collision?

87. ## physics

From the edge of the rooftop of a building, a boy throws a stone at an angle 30.0° above the horizontal. The stone hits the ground 4.10 s later, 112 m away from the base of the building. (Ignore air resistance.) (a) Find the initial velocity of the stone.

88. ## Biochemistry

A peptide has the sequence: Glutamate - His - Trp - Ser - Gly - Leu - Arg - Pro - Gly What is the net charge of the molecule at pH 3, 8, and 11?

89. ## Math

Austin bought a new house. The value of his house is modeled by the function H\left( x \right) = 120000{\left( {1.20} \right)^{\left( {\frac{1}{2}x} \right)}} where x is the number of years since he purchased the house. Looking at the model by what

90. ## statistics

H0 is p = 0.45 and H1 is p ≠ 0.45. What type of test will be performed? A. Two-tail testing of a proportion B. One-tail testing of a proportion C. One-tail testing of a mean D. Two-tail testing of a mean ** I'm stuck between A & D. I chose those

91. ## geometry

Satellite Explorer VII, with a = 4465 and b = 4462, and with the center of the Earth being at one of the foci of the ellipse. Assuming the Earth has a radius of about 3960 miles,graph both the orbits of Explorer VII and earths surface on the same axis if

92. ## Algebra

If you bought 6 pears and 20 oranges and then bought 11 pears and 12 oranges and spent the same each time, how much do oranges cost if the pears are 80 cents each?

93. ## Chemisty

What is the molarity of the hydrochloric acid solution used if 25mL of it reacted with excess calcium carbonate to produce 5.3g of calcium chloride? CaCo3(s) + 2HCl(aq)---> CaCl2(aq) + CO2(g) + H2O(l) I am really confused on even what this question is

94. ## physics

two equal mass cars collide head to tail and their bumpers lock. One car has a velocity of 10m/s and the other is at rest. what is the velocity of the two cars after the collision?

95. ## Social Studies

"Spreading light...without taking part in the affairs of the world...seeing as a trap...all expantion into Africa or the Orient-for a great nation to live this way, believe me, is...in less time than you may think, to sink from the first rank to the third

96. ## Physics

the temperature at the surface of the sun is approximatly at 5700K and the temperature at the surface of the earth is approxiamtly 290 K. what entropy change occurs when 1100 J of energy is transfered by radiation from the sun to the earth?

97. ## Math

Angle x is in the second quadrant and angle y is in the first quadrant such that sinx=5/13 and cosy=3/5, determine and exact value for cos (x+y). I have no idea how to even start this question. Could someone please help me?

98. ## Organic Chemistry

Explain why the addition of bromine to trans-cinnamic acid takes place more slowly than the addition of Br2 to a normal alkene like 3-hexene or cyclohexene.

99. ## Math

Nata spent \$28 on 2 DVDs. At this rate, how much would 5 DVDs cost?