Jojo

Popular questions and responses by Jojo
1. physics 1

The base of a pyramid covers an area of 13.0 acres (1 acre = 43,560 ft2) and has a height of 481 ft. If the volume of a pyramid is given by the expression V = (1/3)bh, where b is the area of the base and h is the height, find the volume of this pyramid in

2. chem 111

What is the molarity of a solution of 10.0% by mass cadmium sulfate, CdSO4 (molar mass = 208.46 g/mol) by mass? The density of the solution is 1.10 g/mL.

3. physics

A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 205 mi/h in 2.70 s. (a) Find the average acceleration of the plane. (b) Assuming the acceleration is constant, find the distance the plane moves.

4. math

explain how you would write the number that is 2 tens more than 53?

5. algebra

a building in a city has a rectangular base. the lenght of the base measures 70 ft less than twice the width. the perimeter of this base is 820 ft.

6. math

Find the largest angle for which sine and tangent agree to within two significant figures. Please explain ^_^

7. math

Certain investments compound interest at different intervals. What effect does the size of the compounding interval have on the yield of the investment?

8. Stat

when you are comparing two sets of data, and one set is strongly skewed and the other is symmetric, which measures of the center and variation should you choose for the comparison?

9. Linear Approximation

Use linear approximation, i.e. the tangent line, to approximate 1/0.104 as follows: Let f(x)=1/x and find the equation of the tangent line to f(x) at a "nice" point near 0.104 . Then use this to approximate 1/0.104 . L(x)=f(a)+f'(a)(x-a)...i think. You're

10. Calculus/Math

The slope field for a differential equation is shown in the figure. Determine the general solution of this equation. The slope field has positive slopes in quadrants 2 and 4 and negative slopes in quadrants 1 and 4. It looks like a circle and at (0,0) it

11. American History

Check my answers? 1. In what way was the government of ancient Athens different from the united states A) Athens was a direct democracy in which citizens ** B) Athens was an oligarchy ruled by the wealthy members of the council of five hundred C) Athens

12. algebra

solve 3/2x-4=16 A.x=20 B.x=13 1/3 B.x=15 1/3 D.30 I got 40/30 but thats not one of the answers

13. math

While working on the roof of his house, John leans a 15 foot ladder against a second story window. If the distance on the ground between the base of the ladder and the house is nine feet, at what height does the ladder reach the second story window? In

14. math

Multiplying 2.1 and the number r results in 6.174. What is the value of r? Drag and drop the correct number into the box so that the equation is true.

15. physics

A jet plane lands with a speed of 81 m/s and can accelerate at a maximum rate of −5.00 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? (b) Can this plane land on a

16. physics

When a driver presses the brake pedal, his car stops with an acceleration of -8.7 m/s2. How far will the car travel while coming to a complete stop if its initial speed was 10 m/s?

17. Stat

1) one indicator of a outlier is that an observation is more than 2.5 standard deviations from the mean. Consider the data value 80. (a) if a data set has mean 70 and standard deviation 5, is 80 a suspect outlier? be sure to work that explains your answer

18. chemistry

The partial pressure of O2 in your lungs varies from 25 mm Hg to 40 mm Hg. What mass of O2 can dissolve in 1.0L OF water at 25.0oC when the O2 partial pressure is 40. mm Hg?

19. algebra

which ordered pair is a solution to the equation y=-5x+4 A.(2,14) B.(5,-29) C.(3,-19) D.(5,-21)

20. Science

What do safty symbols look like? What do they mean? provide at least three examples.

21. s. economics

Brooke and Georgia are neighbors. Each have 40 hours per week. Brooke needs 5 hours to paint a beautiful picture and 2 hours to make a picture frame. Georgia takes 8 hours to paint an equally beautiful picture and 4 hours to make a picture frame. What two

22. history

What is the mayflower compact? A. a long-term treaty for trade routes with the duch tea company B. a formal method to establish systematic order on the pilgrams C. an economic agreement to freely make and sell goods to the british D. a formal agreement by

23. English

In "Shall I Compare Thee to a Summer's Day", what is an example of personification?

24. Chem 10

Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter the correct number of significant figures. (2.700e2 cm)3 / (1.20e3 cm)2 Can't understand how many sig figs.

25. Algebra 2

Evaluate the function when x=1. f(x)=4x-2. Write the input and output as a set of ordered pairs, and identify the domain and range of the ordered pair. (6 points) Ordered Pair: Domain: Range: Write an equation of direct variation that passes through the

26. Math PLZZZ HELPP MEE!!!

the area of the parallelogram. Quadrilateral top: 5 cm side: 14 cm length: 12 cm *38 cm2 *60 cm2 •• *70 cm2 *168 cm2 3. Find the perimeter of the parallelogram. Quadrilateral top: 10.8 ft side: 5.1 ft length: 2.3 ft *15.9 ft *24.84 ft *31.8 ft ••

27. Math HELPP!!

Eric Drew and up to's triangle. Which of the following could be true for Eric's triangle. A: all three angles have equal measures B: possible angle measures of the triangle are 92, 48, and 40•• C: two of the angles are equal, and the third angle has a

28. gtuc

1. WRITE A PROGRAM TO CALCULATRE THE AREA OF A RECTANGLE OF LENGTH =5 CM AND BREADTH=8CM. 2. CALCULATE THE PRICE OF AN ITEM COSTING 100 GHANA CEDIS AFTER A DISCOUNT OF 10% IS APPLIED TO IT. 3. WRITE A PROGRAM TO CALCULATE THE SIMPLE INTEREST ON A LOAN

29. chemistry

A 35.0g sample of ethylene glycol is dissolved in 500.0g of water. The vapor pressure of water at 32C is equal to 35.7mm Hg. What is the vapor pressure of the water-ethylene glycol solution at 32C?

30. AP STATISTICS

Mens shirt sizes are determined by neck sizes. suppose the mens nexck sizes are approximatley normally distributed with mean 15.7 inches and standard deviation 0.7 inch.retailer sells men shirts in S,M,L,XL where the shirt sizes are defined in the table

31. Fundamentals of Electricity

The box-like Gaussian surface of Fig. 1 encloses a net charge of +24.0ε0 C and lies in an electric field given by N/C, with x and z in meters and b a constant. The bottom face is in the xz plane; the top face is in the horizontal plane passing through y2

32. Texas State History

which of the following best characterizes interest groups in texas? A)The Texas Ethics Commission police interest groups to sop bribery disguised as campaign contributions B)Interest groups in Texas have very little influence on decisions made by texas

33. algebra

Give an example of an open equation? my answer is, x + 4 = 7 Until the value of x is found, it is unknown whether the equation is true or false. am i right?

34. pre algebra

Given w+10 what is the answer to w+(w-12/2 square *3)*7

35. chemistry

The vapor pressure of ethanol is 54.68 mm Hg at 25oC. How many grams of chlorophyll , C55H72MgN4O5, a nonvolatile, nonelectrolyte (MW = 893.5 g/mol), must be added to 207.6 grams of ethanol to reduce the vapor pressure to 53.60 mm Hg ? ethanol = CH3CH2OH =

36. Maths

Tan theta = 5/12 find the value of cosec theta

37. physics

The system of small objects shown in the figure below is rotating at an angular speed of 2.0 rev/s. The objects are connected by light, flexible spokes that can be lengthened or shortened. What is the new angular speed if the spokes are shortened to 0.15

38. physics

A centrifuge in a medical laboratory rotates at an angular speed of 3,550 rev/min. When switched off, it rotates through 54.0 revolutions before coming to rest. Find the constant angular acceleration (in rad/s2) of the centrifuge.

39. physics

A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity

40. chemistry

how many significant figures are in the measurement 0.002 ml? 2??

41. Chemistry

17. You have the following equations: 2S (s) + 3O2 (g) 2SO3 (g), H = 792 kJ 2S (s) + 2O2 (g) 2SO2 (g), H = ? 2SO2 (g) + O2 (g) 2SO3 (g), H = 198 kJ What is the missing H?

42. 4gr math

write 7026 in expanded form. then use words to the number

43. pre-algebra

The perimeter of a triangle is 195 mm.If the lengths of the sides are consecutive odd integers,find the length of each side. what steps do i need to do in order to get the answre? Perimeter= L + L+2 + L+4 solve for L. That is the short side. THen add two

44. algebra

The ratio of the length to width of a rectangle is 5:8. If the width of the rectangle is 42 inches, what is the perimeter of the rectangle, to the nearest tenth?

45. math

How long will it take a bird traveling at an average speed of 12 mph to travel 202 miles while flying south for the winter

46. Math

7 pt 1 c + 4 pt 1 c =?

47. history

How were the Spanish able to conquer two great empires with only a handful of soldiers? First, the Spanish had superior military equipment. They were protected by steel armor and had guns. The Aztecs and Incas relied on clubs, bows and arrows, and spears.

48. Science

How should I prepare for a field study and what should I do if there's an accident?

49. Language Arts

How do you know squeaky won't let gretchen win in Raymond's Run

50. Chemistry

8) ( 1 point) What is the maximum number of grams PH₃ that can be formed when 3.4 g of phosphorus reacts with 4 grams of hydrogen to form PH₃? P₄ (g) +6H₂ (g) → 4PH₃ (g) * 3.7 g 6.8 g 45 g 270 g 10. Lead nitrate can be decomposed by heating.

51. physics

A playground merry-go-round of radius 2.00 m has a moment of inertia I = 255 kg·m2 and is rotating about a frictionless vertical axle. As a child of mass 25.0 kg stands at a distance of 1.00 m from the axle, the system (merry-go-round and child) rotates

52. physics

In a circus performance, a large 5.0 kg hoop of radius 3.0 m rolls without slipping. If the hoop is given an angular speed of 3.0 rad/s while rolling on the horizontal and allowed to roll up a ramp inclined at 10° with the horizontal, how far (measured

53. Art

Which of the best definitions of personification? Giving animals and objects human characteristics•• Developing new characteristics of Personality Giving yourself the characteristics of someone else Giving human characteristics of animals Correct me if

54. physics 1

A ladder 8.70 m long leans against the side of a building. If the ladder is inclined at an angle of 69.0° to the horizontal, what is the horizontal distance from the bottom of the ladder to the building?

55. chemistry

nitrosyl bromide, NOBr is formed from NO and Br2-. Experiments show that this reaction is second order in NO and first order in Br2. what is the rate equation for this reaction?

56. chemistry

calculate the Henry's law proportionality constant for N2? partial pressure at 1 atm=0.78 atm solubility at 1 atm= 5.3 x 10^-3 mol/L

57. physics

A spherical bowling ball with mass m = 4.1 kg and radius R = 0.116 m is thrown down the lane with an initial speed of v = 8.9 m/s. The coefficient of kinetic friction between the sliding ball and the ground is ¦Ì = 0.34. Once the ball begins to roll

58. social studies

in what ways could the natural barrier of the himalayas have both helped and hurt the cicilization of the indus river valley

59. calculus

Find c for Rolle's Theorem for f(x) = x3 – 12x on [0,2 3 ]

60. com 156

What are some red flags that indicate you should avoid a particular source?

61. 4gr math

how do you draw a perpendicular lines

62. science-biology

name two processes for which DNA is responsible for what are the three components to a DNA nucleotide

63. math b

solve each system of equation algebraically: x2+y2=18 x+y=4

64. Chemistry

For my homework the question is... What is the half life of polonium 214 if a 1 gram sample decays to 31.25mg after 820 seconds? Im not sure how you arrive at the answer, my friend says the answer is 5 but were not sure how to do it..thanks for any help u

65. Pre-Calculus

Assume two radar stations that are 25 miles apart are both tracking a plane. At a given moment, the angle between Station 1 and the plane is 73 °, while the angle between Station 2 and the plane is 46 °. How far is the plane from Station 2?

66. science

how do scientists explain the fact that some landforms that are far apart and separated by oceans appear to be related?

67. algebra

Determine the orderd pair is a solution y=x + 2/7 A.(0,0) B.(-1,2/5) C.(1,2/5)*** D.(2,2 2/5)

68. algebra

PLEASE HELP ITS URGENT Pizza costs \$1.50 per slice. Use a table and an equation to represent the relationship between the number of slices of pizza bought and the total cost.

69. algebra

Give an example of an open equation? my answer is, x + 4 = 7 Until the value of x is found, it is unknown whether the equation is true or false. am i right?

70. Math

Marcus bake loaf of bread of banana bread for a party he cut the loaf into equal size . At the end of the party there were 6 pieces left . Explain how you can find the number of pieces in the whole loaf if Marcus told 1/3 of the loaf was left

71. physics

Suppose a 1800-kg car passes over a bump in a roadway that follows the arc of a circle of radius 18.4 m as in the figure shown below. (a) What force does the road exert on the car as the car passes the highest point of the bump if the car travels at 9.24

72. Physics

A pendulum is constructed of a mass m connected to a mass ess rigid rod of lengthl. As shownin the figure, the other end of the rodis suspended from a point on the ring ofradius R. The pendulum is free to swing in a vertical plane that is also the plane of

73. physics

A marble is flicked horizontally off a desk with a speed of 3.1 m/s. If it takes the marble 0.8 seconds to hit the ground, how far from the desk does it land?

74. chemistry

is the formation of an aqueous solution with water, a physical or chemical property? physical..... because the substance doesn't change.....

75. chemistry

what part of the meniscus must be read to accurately record the volume of a liquid in a graduated cylinder??? the lowest of the bubble?

76. Social Studies

explain whether conflict was unavoidable in Colombia. Why or why not? i don't understand.

77. math

a ship leaves point A and travels 60 miles due east, then travels northward 59 degrees to point C, and travel 60 miles to point C, find the distance from point A to point C

78. chemistry

The concentration of CO2 in an unopened soda can is 0.0506 m at 25 C. What is the partial pressure of CO2 gas in the can?

79. math

(a)Given the points P(3,5),Q(8,10)and R(8,0),find the equation of a line which is perpendicular to QR and passes through the mid point of QR. (b)The line 2x+3y=2 and 7x-3y=10 intersect at A . Find the equation of the line which passes through A and is

80. english

Where will I put the quotation in the sentence: I said that I might have left my book in Math class.

Which one of the following major concepts is NOT included in the conceptual framework on which education nutrition is based? a.nutrition is how the body uses food b.food is composed of nutrients required for health c.every person needs a variety of

82. Chemistry

12. In a calorimeter, 10 g of ice absorbs heat with an enthalpy of fusion of 334 J/g. What is the heat absorbed? q = mCHf I am having a lot of trouble on this type of problem in chem. Help and an explanation would be greatly appreciated. Thank you.

83. math

Julia is reading a 456-page book. During the past 7 days she has read 168 pages. If she continues reading at the same rate, how many more days will it take her to complete the book?

84. physics

An 80.9 kg astronaut is taking a space walk to work on the engines of his ship, which is drifting through space with a constant velocity. The astronaut, wishing to get a better view of the Universe, pushes against the ship and much later finds himself 30.3

85. Math

Julie owns a video store. Her monthlyexpenses, including rent, average \$1,185. This year she made \$34,620 in revenue. What is the difference between her average monthly revenue and her average monthly expenses? HELP

86. chemistry

Use the concepts of effective nuclear charge, shielding, and n value of the valence orbital to explain the trend in atomic radius as you move across a period in the periodic table.

87. math

jenna wants to purchase a pad of drawing paper for \$5.00, a charcoal pencil for \$0.75, and an eraser for \$1.25. how much money doses she need altogether to buy the supplies

88. Physics

two converging lenses placed L1=20 cm apart. the focal lengths are f1=10 cm and f2=20cm 1) where is the final image located for an object that L2=30cm infront of the first lens? 2)what is the total magnification of the lens system? *diagram*

89. 4gr math

round 64 to the nearest ten. round 87 to the nearest ten. then add the rounded numners.

90. 4gr math

an adult cheetah weighs about 130 pounds. an adult mountain lion weighs about 170 pounda. a student estimates that a mountain lion weighs about twice as much as a cheetah. is the estimate reasonable? explain why or why not

91. math

leah wants to put square floor tiles that measure one foot on each side in a room that is 9 feet and 9 feet wide. How many floor tiles will leah need? is your answer reasonable? explain why

92. math

use digits to write four hundred seventy-five thousand three hundred forty-two. then circle the digit in the ten-thousands place

93. math

Please help me solve this problem... thanks! 1.Find the equation of the line that cntains the pont (5, -1) and has slope -1/2 2.find the equation of the line that passes through the points (-2,1) and (1,-5)

94. math b

the vertices of triangle ABC are A(-2,3), B(0,-3), and C(4,1). prove, by means of coordinate geometry, that the median to side BC is also the altitude to side BC.

95. math b

solve each system of equations algebraically: x^2+y^2=18 x+y=4

96. Math

How would you work this problem? Thanks! Josie paid \$72.00 for a baseball glove. Price reflected 10% discount off regular price. What was regular price?

97. math

Which three options are true about the quadratic equation?? y= 4t^2 + 16t + 18 A. The graph has a minimum. B. The graph of y crosses the horizontal axis at t = 10 and t = 20. C. The equation 4t^2 + 16 + 18 = 6 has one real solution. D. The function has a

98. chemistry

If there are 80 milligrams of a radioactive element decays to 10 milligrams in 30 minutes then what is the elements half life in minutes? Ok i narrowed it down to either 10 or 30...but im rly confused so if u could help it wuld be grea 80 40 1 min 20 2 min

99. English

I need some help with analogies Maple: ____ :: Fir : evergreen Poet:________ :: musician: concert Ultrasonic: sound :: _______: lights joints: inflamed :: _______: atrophy control: order :: anarchy: ________ movie: _____ :: sculpture : vending Thks!!!