# Questions Asked onMarch 23, 2016

1. ## statistics

Among 15 metal parts produced in a machine shop, 4 are defective. If a random sample of five of these metal parts is selected, find a) The probability that this sample will contain at least three defectives. b) The probability that this sample will contain

2. ## Chemistry

If a mothball (C10H8) has a mass of 1.32 grams, how many naphthalene molecules does it contain? If I'm right just multiply 1.32g by 6.022*10^23 and the answer is 7.949*10^23 molecules. Is this right?

3. ## chemistry

3NO2(g) + H2O(l) → 2HNO3(l) + NO(g) How many moles of nitric acid are produced starting from 5.00 moles of NO2(g) and 2.00 moles of water? Please help,

4. ## Math

If adriana drew 20 pitchers and 3/4 of them are in art class how many pitchers did adriana draw in art class

To scale something can mean

6. ## Algebra

The hypotenuse of a right triangle is 13 inches long. The shorter leg is 7 inches shorter than the longer leg. Find the side lengths of the triangle.

7. ## Chemistry

The solubility of sodium chloride is 35.9/100 ml in STP, try dissolving 1 kg of salt in 1 l of water what happens? how much salt will be dissolved and how much salt will be insoluble?

8. ## Geometric progression

sum of 4 terms of g p is 30 & sum of first and last term is 18 . Find gp a(r^4-1)/(r-1) = 30 a + ar^3 = 18 a(1+r^3) = 18 it's easy to see that if a=2, r=2 Does that work on S4? 2*15/1 = 30. Yes So, the GP is 2,4,8,16,... But sir I want not logic proof ,

9. ## Math

Write 14 2/9% as a ratio. Here what I have done so far. I change 2.9 into decimal = 0.22 therefore, 14.22. I change 14.22 into decimal = 0.1422. Do I divide 0.1422 by 10,000 or 1000 to make into a simplified fraction?

10. ## Combination

In a question paper there are two parts A and B . Part A contains 6 questions and part B contains 7 questions . in how many ways a student can select 4 questions in part A of which 2 questions are compulsory and 5 questions in part B of which 3 questions

11. ## Science

'Cl(OCl)Cl' What is the name of it?

12. ## Math

Write 1/6 as a complex percent. The answer is 16 2/3%. I have NO idea what to do. Thank you

100+1674

14. ## Chemistry

Consider the chemical equation. 2H2 + O2 -> 2H2O What is the percent yield of H2O if 87.0 g of H2O is produced by combining 95.0 g of O2 and 11.0 g of H2? a 56.5% b 59.0% c 88.5% d 99.7%

15. ## Chemistry

A compound of B and H is found to have a mass percent composition of 81.1% Boron. Its empirical formula is B2H5. A mass spectrometry experiment tells us that the molecular mass is 53.3 g/mol. What is its molecular formula? So I feel like this is a trick

16. ## trigonometry

x×sin^3A=y , cos^3A = sinA × cosA , x×sinA= y×cosA , then prove that x^2+ y^2= 1 I have no idea

17. ## physics

A tank attached to an air compressor contains 20.0 litre of air at a temperature of 30¡ãc and guage pressure of 4.00¡Á10^5 pa. What is the mass of air, and what volume would it occupy at normal atmospheric pressure and 0¡ãc. Air is a mixture of

18. ## geometry

In triangle FGH, g = 8ft, h=13ft, and m=F= 72degrees. Find m

19. ## Chemistry

You dissolve 6g of Co(ClO4)2 (molar mass: 257.83) in 1 liter of water. Assuming the entire sample dissolves, how many individual perchlorate ions are present in this solution? I'm so lost where to start.

20. ## Linear Algebra

Diagonalize the matrix A = [1,1;-2,4] using a similarity transformation. Give the transformation matrices such that (C^−1)AC = D, where D is a diagonal matrix. (D, C) = ?

21. ## Math

Shannon drove for 540 minutes, if she traveled 65 miles per hour, how many miles did she travel? My answer: 581

asked by Is my work correct?
22. ## English

1. My hobby is internet games and paper folding. 2. My hobbies are internet games and paper folding. ----------- Which one is grammatical? 3. My hobby is exchanging text messages on Kakao Talk on my smart phone. 4. My hobby is talking with my friends on

23. ## algebra 1 or pre algebra

Which of the following numbers is not in the domain of the function (f)=x(x^2-16)/x^2-5x-6 4 a B) 4 C) 0 D) 6 E) 1

24. ## Chemistry

Gold has a density of 19.3 g/cm3. The thickness of a piece of gold leaf weighing 1.93 mg and covering an area of 14.5 cm2 is? I solved for volume=10000cm3 then I solved for height and got 690cm is the thickness of gold leaf. Can anyone confirm or deny?

25. ## Mathametical Literacy,Agricultural Science,History,Geography,English,Life Orientation and Tshivenda

Which job can I get by these subjects?

26. ## maths

find the value of (5/6(1/2+2/3+3/4-4/5))/1/8 in the lowest form

27. ## PHYSICS

A box slides down a frictionless, 10-meter, 30o incline. Calculate the gravitational potential energy at both the beginning and end of the motion. Calculate the work done by GRAVITY as the box slides down the incline. Compare this to the overall change in

28. ## division and remainder...error ws from my teacher not me

1+2^2+3^3+4^4+.....+10^10 when is is divided by 5 what is the remainder!! show working,please have been trying that i could not,get it

29. ## physics

A horizontal, straight wire carrying 12 A current from east to west is in the earth's magnetic field B. At this place, B is parallel to the surface of the earth, points north and its magnitude is 0.04mT. Determine the Magnetic Force on 1 m length of wire.

30. ## PHYSICS

Hooke's Law: 1.) If it takes 10 N to compress a spring 20cm, how much energy will be stored in the spring when it is stretched 50cm. ***Also, for ex: If I am doing work against a restoring force, say, doing work against gravity, what kind of force is the

31. ## Math

How can you use theoretical probability to make predictions in real-world situations? Complete the statement. You can find the theoretical probability of an event and then use it to make a prediction by setting up a IS THIS CORRECT? My answer: A.

32. ## physics

A uniform thin wire is bent into a semicircle of radius r. Determine the coordinates of its center of mass with respect to an origin of coordinates at the center of the "full" circle. Because wire is uniform x (sub cm) = 0 mass=dm length=dl coordinates

33. ## science

a person roller skates down a street heading east which of the following would be true abot friction in this scenario? ----------------------------------- 1.A. friction does not affect the skates in this scenario 2.B. friction pulls the skates wheels

34. ## Uthan

A number consists of 3 digits whose sum 9,when digits are reversed, the number decreased by 198 .the number is ...? thanks

56. ## statistics

Among 15 metal parts produced in a machine shop, 4 are defective. If a random sample of five of these metal parts is selected, find a) The probability that this sample will contain at least three defectives. b) The probability that this sample will contain

57. ## Nature Science

Which of the following can be accurately said about climax communities? A. Climax communities are always stable. (B. Restoration of the original climax community is always achieved at the same rate.) C. Climax communities are always uniform. D. Restoration

58. ## probability

Maya has 12 balls placed in a sack, 5 of them are red, 4 of them are blue and the remaining ones are yellow. Maya draws a single ball from the sack. What is the probability that the ball is red?

59. ## Algebra II

An air show is scheduled for an airport located on a coordinate system measured in miles. The air traffic controllers have closed the airspace, modeled by a quadratic equation, to non-air show traffic. The boundary of the closed airspace starts at the

60. ## math !

A bean plant was 1.5 meters high one week ago. In 7 days it grew 15 centimeters. Find the current height of the bean plant. A)1.35 m B)13.6 cm C)1.65 m D)1.85 cm (I'm having trouble with this !! NO I don't want the answer I just need a way to get the

61. ## Algebra II

The quantity q varies inversely with the square of m and directly with the product of r and x. When q is 2.5, m is 4 and the product of r and x is 8. What is the constant of variation?

62. ## Algebra II

The graph below represents c, the amount a phone company charges, based on m, the number of minutes the customer uses each month. If there are a maximum of 44,640 minutes in a month, which equation best represents the phone company’s charges?

63. ## mathematics-slope of tangent

Find the slope of the tangent to the curve x^2+xy+y^2=4 at the point(2,-2) please show workings #thanks

64. ## math !

Find the surface area of the rectangular prism with l= 12.5 m, w= 16.5 m, and h= 5.5 m. My Answer )1134.375 (I'm having doubys about my answer , is it correct ?)

65. ## Science

Which of the following can be accurately said about climax communities? A. Climax communities are always stable. (B. Restoration of the original climax community is always achieved at the same rate.) C. Climax communities are always uniform. D. Restoration

66. ## Physics

A 66-kg water skier is being pulled by a nylon (Young's modulus 3.7 x 109 N/m2) tow rope that is attached to a boat. The unstretched length of the rope is 20 m and its cross-section area is 2.8 x 10-5 m2. As the skier moves, a resistive force (due to the

67. ## Science

True or False? Energy is measured in Newtons?

68. ## English

Choose the best paraphrase of these lines from the "The Sidewalk Racer" A)I wish I could move as fast as a car or a plane, but I cant because I am only a human. B)I feel as if I am botha single engine plane and a car.(I pick this) C)With my one-engine

69. ## Geometry

Describe in words the translation of X represented by the translation rule T < -7, -8 > (X). A. 7 units to the right and 8 units up B. 8 units to the left and 7 units up C. 7 units to the right and 8 units down D. 7 units to the left and 8 units down*****

70. ## physics

Fifty liters of gas is kept at a temperature of 200 K and under pressure of 15 atm. The temperature of the gas is increased to 400 K. The pressure is decreased to 7.5 atm. What is the resulting volume of the gas?

71. ## physics

A uniform thin wire is bent into a semicircle of radius r. Determine the coordinates of its center of mass with respect to an origin of coordinates at the center of the "full" circle. Because wire is uniform x (sub cm) = 0 mass=dm length=dl coordinates

72. ## math !

A quilt design uses parallelogram-shaped pieces that have a base measure of 6 inches and a height of 8 inches. If 15 pieces are used in the quilt, what is the total area of the parallelogram-shaped pieces in the quilt? A)150 in B)360 in C)720 in** D)1,440

73. ## math

An executive traveling at 60 km hr would arrive 10 minutes early for an appointment, whereas at a speed of 45 km hr the executive would arrive 5 minutes early.how much time is there until the appointment?

74. ## mathematics

the length of a rectangle is 5/4th of breadth. if its perimeter is 81 m, find area.

75. ## Physics

a uniform thin wire is bent into a semicircle of radius r, determine the coordinates of its center of mass with respect to an origin of coordinates at the center of the full circle

76. ## AP Calculus AB

An object has a constant acceleration of 40 ft/sec2, an initial velocity of -20 ft/sec, and an initial position of 10 ft

77. ## History

which of the following was a significant part of the civil rights movement? a.) the civil rights movement got national attention. b.) laws were passed as a result of the civil rights movement. c.) the president provided support of the civil rights

78. ## AP Calculus AB

Set up, but do not evaluate, the integral which gives the volume when the region bounded by the curves y = Ln(x), y = 1, and x = 1 is revolved around the line y = -1. I don't understand the washer thickness topic which is why im having trouble with this

79. ## Math

Determine if the Mean Value Theorem for Integrals applies to the function f(x) = x3 - 16x on the interval [-1, 1]. If so, find the x-coordinates of the point(s) guaranteed to exist by the theorem.

80. ## math

The mean of 14 numbers is 50. Removing one of the numbers causes the mean to decrease to 43. What number was removed?

81. ## chemistry

what kind of reactions require oxidizing agent(reduced or oxidized) for example SO3->SO4 does it require oxidizing or reducing agent why?