# Dave

Popular questions and responses by Dave
1. ## math

Fido weighs 26 pounds more than Fifi. Fifi weighs 12 pounds less than Rover. If the sum of their weights is 71, how much does Fifi weigh?

2. ## statistics

A random sample of size 36 is taken from a population with mean 50 and standard deviation 5. Find P( < 51.5).

3. ## spanish

Answer the questions negatively, using the imperfect tense. Make sure to include the direct object pronoun when needed. Follow the model. Modelo ¿Juega Daniel al fútbol? No, pero antes lo jugaba. ¿Hablas por teléfono? No hablaba ¿Fue a la playa

4. ## Chemistry

Suppose you titrated a sample of sulfuric acid (diprotic acid) with a 0.250 M solution of NaOH. Given the data in the table below, what is the concentration of the sulfuric acid solution?

5. ## Social Studies

1. Which of the following apply to fascism? Select all that apply. A rooted in militarism B extreme nationalism C respect for minorities D blind loyalty to the state I think its A,B, and c ----------------------------------- 2. Which of the following best

6. ## Math

Find the 999th derivative of cos x. I got sin x.

7. ## Math

a geometric progression has a third term of 20 and a sum to infinity which is three times the first term. find the first term

8. ## General Chemistry

A student dissolved 4.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution and then diluted it with water to give 275. mL of a final solution. How many grams of NO3- ion are there in the final solution?

9. ## American History

Which statement best describes the Monroe Doctrine? A. The United States welcomed European involvement in all issues in North America. B. The United States welcomed any European involvement in South America. C. The United States pledged to involve itself

10. ## Chemistry

Calculate the equilibrium constant for the following reaction at room temperature, 25 ∘C: N2(g)+O2(g)→2NO(g)

11. ## physics

A uniform pole 7m long and weighing 10kg is supported by a boy 2m from one end and a man 3m from the other end.At what point must a 20kg weight be attached so that the man would support thrice as much weight as the boy?

12. ## Calculus

Gloria would like to construct a box with volume of exactly 45ft^3 using only metal and wood. The metal costs $15/ft^2 and the wood costs$6/ft^2. If the wood is to go on the sides, the metal is to go on the top and bottom, and if the length of the base is

13. ## Science

Which of these statements regarding enzymes is FALSE?

14. ## Physics

The initial kinetic energy imparted to a 0.1 kg bullet is 1036 J. The acceleration of gravity is 9.81 m/s2 . Neglecting air resistance, find the range of this projectile when it is fired at an angle such that the range equals the maximum height attained.

15. ## Chemistry-Solubility Product

Why does effervescence when the Group 2 anion precipitate is acidified imply the presence of (CO3)2- ?

16. ## Physics

A glass bottle full of mercury has a mass 500g. 35°C, 243g of mercury are expelled. Calculate the mass of f mercury remaining in the | bottle. (Cubic expansivity. of mercury . is 1.8×x10^-4 K^(-1), linear . expansivity .of glass is 8.0×10^(-4)k^(-1)

17. ## Math/Statistics

The mean starting salary for graduates in the spring of 2004 was $36,280. Assume that the distribution of starting salaries follows the normal distribution with a standard deviation of$3,300. What percent of the graduates have starting salaries between

18. ## Economics

If Mary takes money from her savings account and buys a T-bond from Jody with that money, it's: A. An expansionary fiscal policy. B. An example of contractionary monetary policy. C. An example of expansionary monetary policy D. An example of neutral

19. ## Trignometry

Use the appropriate reciprocal identity to find the approximate value of sin θ for the given value of csc θ. Use a calculator. csc θ = 2.15750581

20. ## Biochem

If .1ml of serum, 5ml of reagent and 4.9ml of distilled water are mixed together what is the dilution of the serum in the final solution

21. ## Algebra

Given that $x^n - \frac1{x^n}$ is expressible as a polynomial in $x - \frac1x$ with real coefficients only if $n$ is an odd positive integer, find $P(z)$ so that $P\left(x-\frac1x\right) = x^5 - \frac1{x^5}.$

22. ## physics

Identify the force that propels a rocket. 1)The rocket is propelled by the reaction force of the exhaust gasses bouncing off the air molecules outside the rocket. 2)The rocket is propelled because the action force of the rocket on the exhaust gases is

23. ## Physics

A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.2 m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak?

24. ## World History

Regarding Indonesia, which of the following statements is false? A. Indonesia was formerly the British East Indies. B. The first head of Indonesia was Sukarno. C. The first leader of Indonesia was Suharto. D. Indonesia was formerly the Netherlands East

25. ## Physical Science

The main difference between the internal combustion engine and the diesel engine is that the diesel engine A. does not have a crankshaft. B. does not utilize pistons. C. has no connecting rods. D. has no ignition system. pretty sure its d

26. ## chem

A 6.75-g sample of gold (specific heat capacity = 0.130 J/g °C) is heated using 55.8 J of energy. If the original temperature of the gold is 25.0°C, what is its final temperature?

27. ## physics

A ball is released from a hot air balloon moving downward with a velocity of -10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.

28. ## physics help!!!

In February 1955, a paratrooper fell 365 m from an airplane without being able to open his chute but happened to land in snow, suffering only minor injuries. Assume that his speed at impact was 60 m/s (terminal speed), that his mass (including gear) was 90

42. ## Computers

Show what the final output of this function will be. The answer will be in the form x * Z - y Private Function F(x as Int, y As Int, z as Int) If (y = 1) then Return 2 Else Return x * Z - y + F(x-1,y-1, z) End If End Function

43. ## physics/chem

Calculate the number of coulombs of positive charge in 261 cm3 of (neutral) water. (Hint: A hydrogen atom contains one proton; an oxygen atom contains eight protons.)

44. ## calculus : related rates

a balloon rises at a rate of 3 meters per second from a point on the ground 30 meters from an observer. find the rate of change of the angle of elevation of the balloon from the observer when the balloon is 30 meters above the ground... so i drew a small

45. ## Economics

Will the aggregate quantity of goods and services demanded become more sensitive or less sensitive to changes in the price level if an economy becomes closed (that is, as foreign trade disappears)? In terms of the AD/AS diagram, will the AD curve become

46. ## Economics

Which of the following statements would come from someone classified as unemployed? A. I'm not working. I had three interviews this week, and I'm trying to find a job. B. I haven't had a job in a year, and I stopped looking for a job nine months ago. C.

47. ## Chemistry

ELement A has a valence electronic structure of ns2np1. Element B has the valence electronic structure of ns2np5. Write a formula for the compound that would be formed from elements A and B. Element A has three electrons to lose to make the last shell

48. ## Science

During the process of photosynthesis, solar energy is converted into: a. chemical energy. b. heat energy. c. thermal energy. d. mechanical energy. e. nuclear energy. a

49. ## Math

"Cab companies often charge a flat fee for picking someone up and then charge an additional fee per mile driven. Pick a U.S. city and research the rates of two different cab companies in that city. Find companies that charge different amounts per mile and

50. ## Chemistry

Nitrogen monoxide reacts with chlorine gas according to the reaction: 2NO (g) + Cl2 (g) â‡” 2NOCl (g) Kp = 0.27 at 700 K A reaction mixture initially contains equal partial pressures of NO and Cl2 . At equilibrium, the partial pressure of NOCl is 115

51. ## chem

Determine the mass of oxygen in a 7.2-g sample of Al2(SO4)3

52. ## Chemistry

What set of hybrid orbitals is used by Xe in XeO3F2? dsp2 d2sp3 sp3 dsp3 d2sp

53. ## Math

Lim sin(60-x)/2cosx-1 x approaches 60

54. ## math

Consider the equation f(x)= -2 sqrt(X+3). List in order the transformations applied to the parent function.

55. ## Electricity and Electronics

A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and the voltage developed by the generator is 40

56. ## O-Chem

Draw the mechanism of the reaction of (E)-stilbene with Br2.

57. ## Precal

The point (r,theta) in polar coordinates is (7,5) in rectangular coordinates. What is the point (2r, theta + pi/2) in rectangular coordinates? So I tried this problem and got r = sqrt(74). But while finding the value of theta, I got it equal to cot(5/7)

58. ## Chemistry

2CH3CH2CH2OH(l)+9O2(g)→6CO2(g)+8H2O(g) I have to find the delta G delta G of CH3CH2CH2OH(l)=−360.5 KJ/Mol delta G of O2(g)=0 KJ/Mol delta G of CO2(g)=−394.4 KJ/Mol delta G of H20(g)=−228.6 KJ/Mol I keep getting -3426.2 KJ/Mol but its not correct.

59. ## I NEED MATH HELP

$24,000 is invested for 3 years with an APR of 2% and daily compounding. Balance in the account after 3. years is$ ___

60. ## Physics 1

The antinode of a standing wave is 0.052 m away from the nearest node. What is the wavelength of the waves that combine to make the standing wave? ___m

61. ## Math

A piece of aluminum with an unknown mass ios at 85c and is placed in a 2.00 liters of water at 25.0c. The final temperature becomes 33c. What is the mass of aluminum?

62. ## Prob and Stats

The Roper Organization conducted identical surveys 5 years apart. One question asked of women was Are most men basically kind, gentle, and thoughtful? The earlier survey revealed that, of the 3,000 women surveyed, 2,010 said that they were. The later

63. ## College math

What is the probability without replacement of drawing at least one ten (52 card deck)?

64. ## chemistry

The heat of vaporization of a substance is 2900 J/g at its boiling point of 313C. How much of this substance can be vaporized if 58700 J of energy are available?

65. ## Math

What is the sum of the measures of the interior angles of an 11-side polygon?

69. ## SCIENCE 1

The van der waals equation incorporates corrections to the ideal gas in order to account for the properties of real gases one of the correcctions accounts for A.attractions between molecules B.the quantum behavior of molecules C.that average kinetic energy

70. ## math

The acceleration of a particle at a time t moving along the x-axis is give by: a(t) = 4e^(2t). At the instant when t=0, the particle is at the point x=2, moving with velocity v(t)=-2. Find the position of the particle at t=1/2 if you could show me how to

71. ## math

how do you find the reference angle of csc,sec, cot? for example: csc theta= 2 times square root of 3 / 2

72. ## Purchasing Power of Income/ Economy

We use the _________ to determine the purchasing power of income. A. Interest rate. B. Real GDP. C. CPI. D. GDP. E. None of the above. Check this site for your answer. http://www.bls.gov/cpi/

73. ## History

Could someone please find me a website that has great information on Business enterprise in America so I can make a timeline on it. Specific dates that I need are 1906, 1913, 1914 , 1930, 1939. I would greatly appreciate it. This site seems to have the

74. ## Algebra II

Our current assignment is to find the LCM, Least Common Multiple of two polynomials. I think I'm doing it right but I'm not quite sure. For the first question: 2t^2+t-3, 2t^2+5t+3 I have 2t^2+t+3 as the LCM. Is this correct or can somebody step me through

75. ## AP Chemistry

(a) What is the pH of a 2.0 molar solution of acetic acid. Ka of acetic acid = 1.8 x 10¯5 (b) A buffer solution is prepared by adding 0.10 liter of 2.0 molar acetic acid solution to 0.1 liter of a 1.0 molar sodium hydroxide solution. Compute the hydrogen

76. ## Chemistry

I was not the person who wrote that question last night? Chemistry - DrBob222, Wednesday, November 15, 2006 at 7:24pm Yes, it is possible in some cases. For example, CoCl2 is blue in the unhydrated form and pink in the hydrated form. As a kid, I used a

77. ## Chem.

10. Suggest how two very different variables could be manipulated to increase the percent yield of sulphur trioxide. The equation for the reaction follows. 2 SO2(g) + O2(g)>>> 2 SO3(g) + energy Ok, I really don't know this one. Can you please help? Thanks!

78. ## Math

1. Let T = {a, b, c, d}. a. Find an example of a relation of this set that is transitive, but neither reflexive nor symmetric. b. Find an example of a relation on this set that is both transitive and symmetric, but not reflexive.

79. ## Chemistry

What intermolecular forces exist in dichloromethane, n-pentanol, and toluene besides London Dispersion Forces?

80. ## Maths

The height h, in metres, of a ball thrown from a cliff can be modelled by the function with the rule h(t) = 20+15t-5t^2, where t less than/equal to 0 is the time measured in seconds. a) find the initial height of the ball b) find the time at which the ball

81. ## math

: Find the value of x in the figure. ​

82. ## Math

A is partly constant and partly varies as b when A is equal to 15 B was 2 when is equal to A 45 is B equal to 8

83. ## Math

Solve the indefinite integral of 1/sqrt(x^2+2x+5). I solved it all out by completing the square and then trig sub and then drawing a triangle to go back to x variable and got: ln |(sqrt(x^2+2x+5)/2 + (X+1)/2 ) | but the book answer is: ln |(sqrt(x^2+2x+5)

84. ## Math

Solve the indefinite integral of 1/sqrt(x^2+2x+5). I solved it all out by completing the square and then trig sub and then drawing a triangle to go back to x variable and got: ln |(sqrt(x^2+2x+5)/2 + (X+1)/2 ) | but the book answer is: ln |(sqrt(x^2+2x+5)

85. ## Math

Evaluate the integral from [sqrt(pi/2), sqrt(pi)] of x^3*cos(x^2) by first making a substitution and then using integration by parts. I let u = x^2 and du= 2x dx but then it doesn't equal that in the equation?

86. ## Chemistry

A 10.0000 g block of aluminum is heated and placed in a stream of oxygen gas, resulting in the formation of aluminum oxide on the surface of the block. The block is cooled and weighed and found to have a mass of 11.6471 g. The block is then placed in a

87. ## Math

Evaluate the integral of (x^3 + x^4*tanx) from [-pi/4, pi/4] How do we know which one to let equal to u in order to start this whole process? The answer in the book is 0.

88. ## Ed Tech

To edit the text in a smartart graphic, what must be done first ?

89. ## math

a rectangular plate 120 ft long and 80 ft wide is submerged vertically with the longer edge in the surface of the water find the force on one side of the plate

90. ## mechanics

a rectangular plate 120 ft long and 80 ft wide is submerged vertically with the longer edge in the surface of the water find the force on one side of the plate

91. ## Calculus

The region enclosed by the graph e^(x/2), y=1, and x=ln(3) is revolved around the x-axis. Find the volume of the solid generated. I don't understand if we have to use the washer method or the disk method for this one because when I drew it out on a graph

92. ## Social studies

Which of the following factors was most responsible for an unequal distribution of wealth? A There was an increase in business profits. B Wages were not keeping pace with profits of business owners. C Wages were not keeping pace with profits of business

93. ## physics

Identify the force that propels a rocket. 1)The rocket is propelled by the reaction force of the exhaust gasses bouncing off the air molecules outside the rocket. 2)The rocket is propelled because the action force of the rocket on the exhaust gases is

94. ## Physics

Which of the following is an element? H2O Hydrogen Carbon dioxide A supernova

95. ## physics

The contestants at a cycling race travel around a 0.5km radius track. The peloton travels 33 laps in 1 hour to complete the race. What is the total angular distance they have traveled? On the first lap, they start from rest and after traveling ½ the

96. ## Chem

What type of orbitals are used to form the N–N bond in hydrazine, N2H4?

97. ## Math

Can somebody show or explain this to me: Change 6 2/3% to fraction and .6 1/3 to a decimal or fraction.

98. ## Physics

A watertight car is submerged under water. What force is required to open a door of area 1.12 m2 if the average depth of water at the door is 1.50 m?