# Help

Popular questions and responses by Help
1. ## world history

Which option most accurately explains the impact of the First Agricultural Revolution? Early humans ate more foods high in protein and low in starch and grains. Early humans created new social cultures, including laws and inventions. Early humans began to

2. ## Math

Assume that women’s heights are normally distributed with a mean of 63.6inches and a standard deviation of 2.5inches. If 90 women are randomly selected, find the probability that they have a mean height between 62.9inches and 64.0inches.

3. ## Maths

Given that 3^9 + 3^12 + 3^15 + 3^n is a perfect cube number. Calculate the value of n.

4. ## Math

An alloy is composed of nickel, zinc, and copper in a ratio of 3:4:13. How many kilograms of each metal are needed to make 4 kg of this alloy?

5. ## math

A standard deck of cards has 52 cards divided into 4 suits, each of which has 13 cards. Two of the suits (\$\heartsuit\$ and \$\diamondsuit\$, called `hearts' and `diamonds') are red, the other two (\$\spadesuit\$ and \$\clubsuit\$, called `spades' and `clubs')

6. ## math

There are 5 blue chips, 4 red chips and 3 yellow chips in a bag. One chip is drawn from the bag. That chip is placed back into the bag, and a second chip is drawn. What is the probability that the two selected chips are of different colors? Express your

7. ## math

I need help!!!! Write an expression describing all the angles that are coterminal with 127° . (Please use the variable "k" in your answer)

an athlete stretches a spring an extra 40.0 cm. how much energy has he transferred to the spring, if the spring constant is 5286.0 N/m? Us= 1/2kx^2 =1/2(5286.0)(.40)=1057.2 J Thanks!

9. ## history

1) Which group made up the majority of white Southerners? Planters capitalists middle class small farmers 2. Which is the most likely cause of the spike in cotton production in Mississippi in the mid¬ 1800s shown on the chart? the growth in demand for

10. ## physics

a 3.5 kg block is accelerated from rest by a compressed spring of spring constant 640 N/m. The block leaves the spring at the springs relaxation length.The block then travels over a horizontal floor with coefficient of kinetic friction 0.25. The friction

11. ## MATHS

A boy spent 1/4 of his money on sweets and 3/8 on bus fares. What fraction of his money is left?

12. ## Social Studies

Which pull factor would most likely encourage an immigrant who wanted to raise and sell cattle in the United States A. industrial jobs B. inexpensive land C. the promise of freedom D. expensive land in home country I think it's B If anyone had all the

13. ## Physics!!!

A 24-V battery is connected in series with a resistor and an inductor, with R = 5.6 Ω and L = 2.0 H, respectively. (a) Find the energy stored in the inductor when the current reaches its maximum value. (b) Find the energy stored in the inductor one time

14. ## Math

Given the box plot, will the mean or the median provide a better description of the center? box plot with min at 6, Q1 at 7.5, median at 8, Q3 at 23, max at 32.5 The mean, because the data distribution is symmetrical The median, because the data

15. ## math

Assume these facts: i. A course grade is either 0 or a decimal number between 0.7 and 4.0. ii. A course percentage of p = 96 gives a grade of 4.0 and a course percentage of p = 43 gives a grade of 0.7. Between these two percentages, the grade is given by a

16. ## math

Boris and Stella are running on a circular track which has a radius of 300 meters. They start running at the same time. Boris starts at the northernmost point of the track, and Stella starts at the easternmost point. Boris runs clockwise. Stella runs

17. ## calculus

find the function that is finally graphed after the following transformations are applied to the graph of y=square root x in the order listed. a. reflected about the y-axis b. shift down 3 units c. shifht left 9 units please show work

18. ## math

Find the equation of the line that passes through the point (-√3, -1), and makes an angle of 30 degrees with the line y = 1.

19. ## Trig

Use the half-angle formulas to come up with an exact expression for each function value below. You do not have to simplify your answers. cos(pi/16)

20. ## World History

How did the Industrial Revolution introduce justifications for imperialism? (Select all that apply.) Industrialized nations sought to bring technological knowledge to Africa and Asia. Industrialized nations sought colonies to deport people who would work

21. ## math

If the graph of the quadratic function f(x) = x^2 + dx + 3d has its vertex on the x-axis, what are the possible values of d? What if f(x) = x^2 + 3dx − d^2 + 1?

22. ## math

1,5,11,19 (a) calculate next two patterns (b) calculate the nth term of the pattern (c)which term of the pattern is equal to 2549. thanks a lot

23. ## Math

What is the equation of the line shown on the graph? A graph is shown in the xy-plane. The x-axis is labeled as Number of Target Hits and the y-axis is labeled as Number of Points Scored. The values on the x-axis range from 0 to 18 in increments of 2 and

24. ## mathematics

The length of a rectangle is represented by 2x + 3 and the width by 2x -1. Find the perimeter as a polynomial in simplest form.

25. ## mathematics

Which best describes the expression (v +� 6)(v - 6) when simplified? a.monomial b.binomial c.trinomial d.constant

26. ## math

Let f(x) = x + |2x − 1|. Find all solutions to the equation f(x) = 8

27. ## Physics

A 2473 kg elephant is walking at 3 m/s on a flat surface. How much kinetic energy does he have? Answer in Joules

28. ## science

Which option correctly defines a generator? A.a device that converts mechanical energy into electrical energy B.a device that converts electrical energy into mechanical energy C.a device that converts light energy into electrical energy D.a device that

29. ## World History

Which Industrial Revolution inventor improved upon the Newcomen steam engine? James Watt Eli Whitney James Hargraves Elias Howe I think its James HArgraves

30. ## math

Which point is located at (– 3 , – 2)?

31. ## Chemistry

Tube worms that survive near geothermal vents of hydrogen sulfide rely on bacteria living inside them to obtain energy by the oxidation of H2S to SO4^2-. What is the overall change in the oxidation number of sulfur for this reaction?

32. ## Chemistry

Knowing that delta Hvap for water is 40.7 kJ/mol, calculate Pvap of water at 46 C

33. ## Algebra

A size 36 shoe in France is size 3.5 in England. A function that converts shoe sizes in France to those in England is g(x)= 3x-94/4. A size 6 shoe in the United States is size 3.5 in England. A function that converts shoe sizes in England to those in the

34. ## English 10 ASAP

Determining the author's purpose in a text relies on (10 points) biographical information research the author used evidence in the text

35. ## Physics

How fast (in rpm) must a centrifuge rotate if a particle 69-cm from the axis of rotation is to experience an acceleration of 200438 g's? (can you show me how you get the answer) be thorough

36. ## english

13. Which of the following sentences contains a comma splice? A. Our friend, who travelled from Tennessee, was quite tired when he arrived. B. We need help with organization, structure, and spelling. **C. The pots clanged to the kitchen floor, the kitten

37. ## physics

Two workhorses tow a barge along a straight canal. Each horse exerts a constant force of magnitude F, and the tow ropes make an angle θ with the direction of motion of the horses and the barge. (Figure 1) Each horse is traveling at a constant speed v. How

38. ## chemistry

A 32.2 g iron rod, initially at 22.3 C, is submerged into an unknown mass of water at 63.9 C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 58.6 C. What is the mass of the water?

39. ## math

Orlando has a bank statement balance of \$414.25 and \$5.90 service charge. His check register shows \$374.16 and he has two outstanding checks of \$26.54 and \$21.78. What is his true balance?

40. ## physics

Cars A and B are racing each other along a straight path in following manner: Car A has head start and is a distance dA beyond starting line at t=0. The starting line is at x=o. Car A travels at constant speed vA. Car B starts at starting line but has

41. ## Ap Calculus

Find the area of the region bounded by the graphs of y=x, y=-x+6, and y=0

42. ## Algebra 1

The weight needed to balance a lever varies inversely with the distance from the fulcrum to the weight. A 120-lb weight is placed on a lever, 5 ft from the fulcrum. What amount of weight, in pounds, should be placed 8 ft from the fulcrum to balance the

43. ## Social Studies

What did Alexis de Tocqueville observe on his visit to the United States that reflected changes that were happening in the country during Jackson's administration? (1 point) a strict divide between rich and poor a growing spirit of democracy and equality

44. ## Math

the 64 people who answered "yes" to a question, 6 were male. Of the 70 people that answered "no" to the question, 8 were male. If one person is selected at random from the group, what is the probability that the person answered "yes" or was male?

45. ## Communication

1.) Song Xue, a Chinese exchange student, tells his mother during a telephone conversation that he is enjoying his time in America but Americans are loud. What element of forming supportive messages has Song Xue forgotten? A.) ask questions B.) demonstrate

46. ## Math

Use the formula v=lwh to find the volume of a rectangular prism with following dimensions length=7 in. width=4 in. height =3 in.

47. ## math

Fair Race Portfolio Template: Functions Instructions: Follow the instructions provided in the lesson. Use this template to record your work and answers. Please submit this template to the dropbox along with any other evidence you would like to provide for

48. ## World history

9. What evidence best supports the influence of the Moche culture on the Inca empire? A. the creation of the geoglyphs B. the existence of the road networks C. the extensive nature of Incan trade D. the worship of a sun god

49. ## Art

1. An artist places a notebook and pen in the gallery of his latest exhibition and asks viewers to leave comments about his work. He is trying to help audience members become what type of observers? A. Active Observers*** B. Reluctant Observers C. Passive

50. ## Chemistry

Please help Suppose that 0.250mol of methane, CH4(g), is reacted with 0.400mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance ΔH∘f (kJ/mol) C(g)

51. ## math

Let C = 2.32 N + 34180 represent the cost (C) of raising a child to 18 years of age, on an income (N). If the cost is \$120,000, what is the income?(

the horizontal range of a projectile is 4 root 3 times of its maximum height. calculate the angle of projection.

53. ## math

Find the coordinates of the midpoint of the segment whose endpoints are H(5, 13) and K(7, 5).

54. ## Physics

5. Salim has a paper route. In the winter time, he puts his newspapers on a toboggan to pull them through the snow. The combined mass of the papers and the toboggan is 24 kg. The coefficient of static friction between the toboggan and the snow is 0.18. The

55. ## English

1. Choose the answer that best matches the word in italics. Use context clues to determine the meaning of the word, if necessary. The decorations were reminiscent of autumn leaves. (1 point) leftovers made reminders symbolic 2. Choose the answer that best

56. ## Social Studies

1. What negative impact did gold and silver mining have in the west? I think it would be Ghost towns were left behind after the mines stopped producing. Is this right?

57. ## Heath

1. Which digestive organ is the last organ food passes through before reaching your stomach? (1 point) pharynx epiglottis esophagus mouth 2. Starches and sugars belong to which class of nutrients? (1 point) carbohydrates fats proteins enzymes 3. A method

58. ## Mechanical behavior

An atomic force microscope cantilever, of rectangular cross section, has a length, l, of 200μm, a width, b, of 20μm and a depth, h, of 1μm. It is made of silicon nitride, which has a Young's modulus, E, of 300GPa. What is the maximum force that can be

59. ## Chemistry

Suppose that 0.250mol of methane, CH4(g), is reacted with 0.400mol of fluorine, F2(g), forming CF4(g) and HF(g) as sole products. Assuming that the reaction occurs at constant pressure, how much heat is released? Substance ΔH∘f (kJ/mol) C(g) 718.4

60. ## physics

You are a member of an alpine rescue team and must get a box of supplies, with mass 3.00kg , up an incline of constant slope angle 30.0∘ so that it reaches a stranded skier who is a vertical distance 2.90m above the bottom of the incline. There is some

61. ## chemistry

a 5.55g sample of a weak acid with ka=1.3*10^-4 was combined with 5.00ml of 6.00 M NAOH and the resulting solution was diluted to 750mL. The measured pH of the solution was 4.25. what is the molor mass of the weak acid. if used the formula

62. ## chemistry

A solution was prepared by dissolving 43.0 of in 225 of water. Calculate the mass percent of in the solution.

63. ## math

find the expression for: (f(x+h))-(f(x)))/h given: f(x)=sqrt(x-1) hint:rationalize the numerator simplify far enough that plugging in h = 0 would be allowed

64. ## math

find the expression for: (f(x+h))-(f(x)))/h given: f(x)=-pix^2-pi^2 simplify far enough that plugging in h = 0 would be allowed

65. ## probability

Tickets numbered from one to 40 are mixed up and one is drawn. What is the probability that number is divisible by 3 or 5? What is the probability that number is divisible by 3 and 5?

66. ## Science

A student tried to solve the following problem by selecting the conversion below. What, if anything, did the student do wrong? How many moles of AgNO3 are needed to produce 6.75 moles of copper (II) nitrate Cu(NO3)2 upon reacting with excess copper (Cu)?

67. ## math

The stem-and-leaf plot shows the test scores of a science class. Use the plot to answer the question. 1.how many students scored 78? (1 point) 1 student 2 students 3 students 4 students

68. ## Math

Which situation can be represented by the expression x plus negative 3? Choose all that apply. A.An elevator went down 3 floors. B.A person spent \$3. C.A person added 3 books to the shelf. D.The temperature dropped 3 degrees. My Answers are B and C

69. ## Ela

Reread lines 679 - 706. What do the stage directions and dialogue reveal about Mr. Frank

70. ## DYNAMICS

A car has an initial speed of 25m/s and a constant deceleration of 3m/s^2. Determine thewvelocity of the car when t=4s. What is the displacement of the car during the 4-s time interval? How much time is needed to stop the car?

71. ## chemistry

* A 50 gram sample of an unknown metal warms from 18 to 58 after absorbing 800 joules of energy. what is the specific heat of the metal? *copper has a specific heat of 0.387 j/g degree celsius. what is the mass of a piece of copper that undergoes a 21.0 C

72. ## CHEMISTRY

The standard electrode potential for the reduction of Eu3+(aq) to Eu2+(aq) is −0.43 V. determine which of the following is capable of reducing Eu3+(aq) to Eu2+(aq) under standard-state conditions? (a) Sn2+(aq) (b) ln(s) (c) HCN(aq) (d) La(s)

73. ## Physics

Analyze the collision of a baseball with a bat. During which portion of the collision does the baseball’s velocity reach zero? a. before the collision b. during the collision c. one second after the collision d. one-hundredth of a second after the

74. ## math

Find the rules for (f∘g)(x) and (g∘f)(x) and give the domain of each composite function. f(x) = x^2 g(x) = √(1-x) The Domain of (f∘g)(x) is : (f∘g)(x) = The Domain of (g∘f)(x) is : (g∘f)(x) =

75. ## Math

Roni wants to write an equation to represent a proportional relationship that has a constant of proportionality equal to StartFraction 7 over 25 EndFraction. She writes the equation y = x + StartFraction 7 over 25 EndFraction. What error is Roni making? A:

76. ## SS

Which of the following statements best describes the spread of Islam during the Arab conquests? A. Islam spread only within the lands conquered by Arabs. B. Everyone in conquered lands was forced to convert to Islam. === C. Few non-Arabs ever converted to

77. ## Spanish

PLEASE HELP ME! Will make as brainliest! Much appreciated. 1. A celebration in the countryside in which family and friends get together in Cuba is known as a _______. (1 point) Habana Vieja guateque campesino trovadores cocotaxi 2. La Habana Vieja's annual

78. ## college physics

FM radio waves have frequencies between 80.3 and 108 MHz. Determine the range of wavelengths for these waves.

79. ## math

use the distance formula to find the distance between the points (-3,8) and (-4,-1) round to the nearest hundredth if neccesary

80. ## Algebra

Please check all of my answers and tell me if they are right. 1. What is the simplified form of the following expression? 7m^2 + 6.5n – 4n + 2.5m^2 – n (1 point) A. 9.5m^2 + 1.5n*** B. 4.5m^2 + 1.5n C. 1.5m^2 – 4.2n D. 9.5m^2 – 1.5n 2. Simplify the

81. ## Language Arts

"Phoebe turned to me with a puzzled expression on her face. I think that she was surprised at what she said but I new exactly why she lied. It was easier sometimes. " Which type of conflict best characterizes the events in the passage? ^^ -character vs.

82. ## math

3a - 4 less than or equal to 5

83. ## MATH

I NEED HELP -5g - 6 for g= -2 4 16 10 -13 write an algebraic expression for the sum of 3 coins and c coins c+3 c/3 3c c-3 what value of x is a solution to the equation x-2=16 14 18 21 12 z/-12=-5 7 -60 -17 60 estimate the solition of the equation x-8.1=5.3

84. ## English

Select the letter of the pair of words that expresses a relationship expressed by the following pair 1.Stethoscope:doctor a.manager: trainee b.best-seller: publisher c.tool:shovel d.microphone:broadcaster 2.cubism:art a.dictatorship:government b.suit:vest

85. ## math

A textbook store sold a combined total of 315 physics and chemistry textbooks in a week. The number of physics textbooks sold was two times the number of chemistry textbooks sold. How many textbooks of each type were sold?

The number 7 is a factor of 1001. explain how you know 1001 is a multiple of 7? How does knowing that 7 is a factor of 1001 help you to get another factor of 1001?

87. ## Physics

A rocket leaves a launch pad at liftoff with a great deal of upward momentum. What was initially given downward momentum? a. the launch pad b. the astronauts aboard the rocket c. the expelled fuel d. the entire Earth

88. ## Algebra II

A projectile is thrown upward so that its distance above the ground after t sec is given by h(t)=-11t²+264t. After how many seconds does it reach its maximum height?

89. ## physics

The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period? physics - bobpursley,

90. ## Algebra

find the measure of an angle whose supplement measures two times its measure

91. ## Biochemistry

What is the net ionic equation for Phosphate ion + ammonium molybdate in the presence of nitric acid?

92. ## chem

Why are titrations using permanganate performed in acid solution?

93. ## physics

The position of a particle moving along an x axis is given by x = 15t2 - 2.0t3, where x is in meters and t is in seconds. (a) Determine the position, velocity, and acceleration of the particle at t = 3.0 s. x = m v = m/s a = m/s2 (b) What is the maximum

94. ## math

Factor: 81a^2+5b^2

95. ## math

Joe wants to put a fence around his rectangular garden. His garden measures 33 ft by 39 ft. The garden has a path around it that is 3 ft wide. How much fencing material does Joe need to enclose the garden and path?

96. ## math

Find the length of the segment ¯¯¯¯¯¯¯¯ M N with endpoint M at ( 2 , − 3 ) and endpoint N at (8, 5). Round your answer to the nearest tenth, if necessary.

97. ## biology

Identify which of the following statements about genes is true. (Select all that apply.) Genes are "read" by tRNA. Genes hold the instructions for traits. Genes are segments on the DNA strand. Genes hold the instructions for making proteins.

98. ## physics

What is the work done by a crane to lift a 500kg beam over a height of 50.0m? Assume the crane lifts the beam at a constant velocity.