Popular questions and responses by madison
1. ## math

Complete the table for the radioactive isotope. (Round your answer to two decimal places.) Isotope: 239Pu Half-life (years): 24,100 Initial Quantity: g Amount After 1000 Years: 0.6

2. ## Mathematics

The perimeter of the rectangle below is 42 units. Find the value of y. Rectangle side 1: 3y-3 Side 2: 2y-1

3. ## Physics

A mover has to move a heavy sofa of mass 49.0 kg to the second floor of the house. As he pulls on the rope tied to the sofa, he makes sure that the rope is parallel to the surface of the ramp, which is at 30.0° to the horizontal. If the coefficient of

4. ## Physics

A woman fixing her hair holds a plane mirror 30 cm away from the front of her face so as to look into a plane mirror on the bathroom wall behind her. She is 90 cm from the wall mirror. Approximately how far does the image of the back of her head appear in

5. ## General Chemistry

A reaction vessel contains 7.92 g of CO and 7.92 of O2. How many grams of CO2 could be produced according to the follow unbalanced reaction? CO + O2 --> CO2

6. ## math

Complete the table for a savings account in which interest is compounded continuously. (Round your answers to four decimal places.) Initial Investment: \$350 Annual % Rate: % Time to Double: yr Amount After 10 Years: \$435.21

7. ## Math someone plz check

1. How many different lunch combinations can be made from three sandwich choices, two item choices, and four beverage choices if you choose one sandwich, one side, and one beverage? 9 20 24** 2.A bicycle manufacturer offers two styles , three sizes, and

8. ## Math

secx+tanx/secx- tanx = 1+2sinx+sin^2x/ cos^2x

The perimeter of a rectangular field is 380 yd. The length is 10 yd longer than the width. Find the dimensions. Please help and show work thank you

10. ## history narrative

spoken word and written text are different because? a. speakers can include emotion, sound, personality, and feelings that the writer may not be able to express fully through text. b. writers are limited to what they cana nd cannot include for the voice of

11. ## chemistry

consider the following reaction: C3H8 (g)+ 5O2 (g)--> 3CO2 (g)+ 4H20 (g) Delta H = -2440kJ The heat of formation of CO2 is -390 kJ/mol and the heat of formation of H2O is -240 kJ/mol. What is the heat of formation of propane?

12. ## math

The tread life of a particular tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 2000 miles. What is the probability that a randomly selected tire of this brand will last longer than

13. ## Geometry

Consider circle T with radius 24 in. and θ = radians. What is the length of minor arc SV?

14. ## Physics

How many kcal of heat are required to vaporize 25.0kg of water at 100°C?

15. ## chemistry

consider the following reaction: 2C2H6(g)+7O2 (g)-->4CO2(g)+6H2O (g) delta H = -3120kJ If 3.00g of ethane are burned, how many kJ of heat are produced?

16. ## Chemistry

Tetraphosphorus (P4), commonly known as white phosphorus, forms different compounds with chlorine (Cl2) depending on the amount of chlorine present. If chlorine is limited, phosphorus trichloride (PCl3) is formed. If there is an excess of chlorine,

17. ## chem

how do you write the equilibrium expression for: C3H8 + SO2->

18. ## math

explain how a number can name something

19. ## Physics

Three bowling balls form an equilateral triangle. Each ball has a radius of 10.8 cm and a mass of 7.26 kg. What is the total gravitational potential energy of this system?

20. ## science

About 70% of the human population can taste the bitter chemical phenylthiocarbamide (PTC), which is found in foods like broccoli. The allele, T, for tasting PTC is dominant over the allele, t, for not tasting it. Calculate the allele frequencies using the

21. ## Walk Two Moons Sharon Creech

1. Which of the following archetypal patterns best categorizes the Finney Family? A the Sage B The hero C The Villain D The lunatic*** 2. What is the most likely reason Mr. Winterbottom cries at the end of chapter 29? A He is humiliated by Phoebe's

22. ## Freshman Algebra

Using a chart: At noon a private plane left Austin for Los Angeles,2100km away, flying at 500km/h. One hour later a jet left Los Angeles for Austin at 700km/h. At what time did they pass each other?

23. ## chemistry

A gas occupies 560.0 mL at 285 K. To what temperature must the gas be lowered if it is to occupy 250.0 mL? Assume that the pressure remains constant.

24. ## chemistry

Assume that the balloon is filled with carbon dioxide gas at 20°C and standard pressure. Use the ideal gas law to calculate the number of moles and mass of CO2 in each balloon at maximum inflation. balloon 1 volume-150.53 balloon 2 volume- 248.47 balloon

Chris can be paid in one of two ways. Plan A is a salary of ​\$450 per​ month, plus a commission of 7​% of sales. Plan B is a salary of ​\$681 per​ month, plus a commission of 4​% of sales. For what amount of sales is Chris better off selecting

26. ## Physics

NASA lost contact with Pioneer 10 on January 22, 2003. How far in meters was it from the sun on that date? Pioneer 10 was traveling at 12.24 km/s relative to the sun. Calculate the position of Pioneer 10 as of January 2009 relative to the sun. Pioneer is

27. ## Chemistry

Write 3â€“4 sentences to describe how coupling reactions are used to drive an unfavorable chemical reaction

28. ## Trigonometry

Suppose that (5/13,y) is a point in Quadrant IV lying on the unit circle. Find y. Write the exact value not a decimal approximation

29. ## chemistry

Suppose of copper (II) nitrate is dissolved in of a aqueous solution of sodium chromate. Calculate the final molarity of nitrate anion in the solution. You can assume the volume of the solution doesn't change when the copper (II) nitrate is dissolved in

30. ## Chemistry

Is this correct? What is the experimental empirical formula of zinc chloride? Determine the simplest whole number ratio of moles of zinc used, to moles of chlorine reacted in the zinc chloride that was produced..028 moles of Zinc .025 moles of Cl .025

31. ## science

when that air under the envelope is heated , the balloon lifts . which of the following statement is true A. hot air balloons use radiation to rise B. hot air balloons use conduction to rise C. hot air balloons use convection to rise D. hot air balloons

32. ## Walk Two Moons (Chapters 9-11)

1. What is most likely true based on Ben's behavior towards Sal? He thinks she is uptight with her friend Phoebe. He suspects that Sal does not like Mrs Cadaver He worries about Sal's fragile emotional state He likes Sal but is awkward when showing it***

33. ## Algebra

Last year the population of Spoon Forks grew from 1250 to 1300. If the population of the town grows by the same percent this year, what will the population be?

34. ## english 9

Read the conclusion about “The Beginnings of the Maasai,” and then answer the question. One purpose of “The Beginnings of the Maasai” is to explain the weather. Which excerpt best justifies this conclusion? The sky god is powerful, but can change

35. ## Algebra

Does y=-3(4^x) represent an exponential function? I think it does, but I'm not sure

36. ## Chemistry

Analyze each table of ionization energy data (in kJ/mol) to identify each element. a. A Period 3 element (1 point) IE1: 496, IE2: 4562, IE3: 6910, IE4: 9453, IE5: 13354, IE6: 16613, IE7:20117 b. A Period 5 element (1 point) IE1: 403, IE2:2633, IE3: 3860,

37. ## Physics

An air-track cart of mass 0.10 is moving with a speed 1.2 to the right when it collides with a cart of mass 0.24 that is at rest. Each cart has a wad of putty on its bumper, and hence they stick together as a result of their collision. Suppose the average

38. ## Math

Mike can mow a lawn in 3 hours. Paul can mow the same lawn in 2 hours. How long would it take both of them working together to mow the lawn? The answer is suppose to be 20/9. This is what I did and I get 9/20. What am i doing wrong? 1.4x+1/5x=1 which gives

39. ## Social Studies help ASAP

1. After the fall of communism, which type of economy was implanted in Russia? command market socialist market free market mixed economy *** 2. What clues from Boris's story suggest the presence of ethnic tension in Russia today. A. Boris travels around

40. ## Statistics

Scores on the 1995 SAT verbal aptitude test among Kentucky high school seniors were normally distributed with an average of 420 and the SD of 80. Scores on the 1995 SAT quantitative aptitude test among Kentucky high school seniors were normally distributed

The speed of a passenger train is 8 mph faster than the speed of a freight train. The passenger train travels 310 miles in the same time it takes the freight train to travel 270 miles. Find the speed of each train. What is the speed of passenger​ train?

42. ## Algebra

Find the GCF of the terms of the polynomial. 12x+20 A. 2 B. 4 C. 5 D. 10 I think it's B. 4

43. ## College Algebra

The rodent population in a city is currently estimated at 30,000 and is growing according to the Malthusian model. If it is expected to double every 9 years, when will the population reach one million? (Round your answer to one decimal place.)

44. ## Chemistry

Predict the answer to each question according to trends in the periodic table. Justify each answer based on the locations of the elements on the periodic table and/or the shell model. a. Which has a greater atomic radius, Al or Cl? b. Which has a greater

45. ## geometry

Which of the following statements is true?Select one of the options below as your answer:A. A 25o angle is congruent to a 25o angle. B. Two intersecting lines form two pairs of congruent angles. C. It is possible for congruent angles to add up to 90o. D.

46. ## Math

A math class has girls and boys in the seventh grade and girls and boys in the eighth grade. The teacher randomly selects a seventh grader and an eighth grader from the class for a competition. What is the probability that the students she selects are both

47. ## Physics

An Olympic skier moving at 19 m/s down a 26 degree slope encounters a region of wet snow and slides 136 m before coming to a halt. What is the coefficient of friction between the skis and the snow? ( g = 9.81 m/s2)

48. ## math

Colin is working to earn some money for a new cd player. On Saturday he earned half as much as he did on Sunday, but twice as much as he did on Friday. During those three days he earned \$70. How much did he earn each day?

49. ## chemistry

the following reaction is carried out in a bomb calorimeter: 4NH3 (g) +5O2 (g)-->4NO (g)+6H2O (g) The calorimeter constant is 45.0kJ/K. when 34.0g of NH3 are reacted in the calorimeter, the temp rises by 10 degrees C. What is the change in energy, delta E,

50. ## Chemistry-urgent!

What volume of 2.5% (w/v) KOH can be prepared from 125 mL of a 5.0% KOH solution?

An aqueous mixture containing starch (a colloid), NaCl, glucose, and albumin (a colloid) is placed in a dialyzing bag and immersed in distilled water. Which of the following correctly describes the location of the indicated substance after dialysis?

52. ## Chemistry

A 112 mL solution of 0.351 M HCl is added to 52.0 mL of 0.161 M HCl. What is the new concentration of HCl?

53. ## English

How do you fix this pronoun agreement. The first theme that the author demonstrates is to not let people with a disability feel abnormal, but for them to use the abilities that they have to help them build their self-confidence.

54. ## biology

what is one way that flue strains can vary from one another

55. ## Economics

In an economy the marginal propensity to consume is 0.90, and gross domestic product (GDP) is \$100 billion. If gross private domestic investment declines by \$2 billion, then GDP will

56. ## physics

Car Q continue at 26m/s west at the next overpass zip past a cop. The cop begins accelerate 3m/s^2. Eventually cop catches up to car Q who maintained the previous speed(25m/s). Cop side by side motion Q to pull over. A) Determine the time elapsed since cop

57. ## Math

8 1/4 pounds of flour are used to make 4 1/8 paper mache paste recipes. how much flour is used to make one recipe? do i divide 8 1/4 from 4 1/8? ms. sue help me

58. ## Geometry

What is the length of the missing side of the triangle in simplest radical form? One side is 10cm and one side is 6cm. I know that the answer is 2 square root of 34 cm but I would really like to learn how to work through the problem using the Pythagorean

59. ## chemistry

Study the reaction. A(s) + 2BC(aq) →AC2(aq) + B2(g) ΔH = −92.0 kJ/mol Which change would increase the rate of the forward reaction? A. increasing the pressure B. adding more of A(s) C. adding water D. decreasing the temperature B?

60. ## Statistics

A fair coin is to be flipped 500 times. Use the “two-standard-deviation-rule” to calculate two numbers e and f such that the probability that the proportion of times that a head turns up will lie between e and f is approximately 95%. I am totally

61. ## math

1. 1/3 times 7 2. -7/9 times 3/5 3. 1/3 divided by 5/6 4. 2 1/8 divided by 34 5. -3/5 divided by - 3/4 6. -4/5 divided by 8/9 7. 3/5 divided by 9/10 8. 4/7 divided by 9/14 i dont know the answers.

62. ## math

sam has 4/5 yards of yarn. he used 3/8 of the yarn. how many yards of yarn did he use? a. 5/8 b. 7/10 c. 3/10 d. 3/13 i dont know the answer and i need help getting the answer.

Inherited traits are passed down from our parents to us, their offspring, by the information that is coded in our parents' A) RNA. B) antibodies. C) chromosomes. D) plasma. Your gender, whether you are male or female, is determined by the A) X or Y

64. ## SS-Writeacher

Communism and socialism are usually found in what type of economic system? A) command*** B) traditional C) pure market D) mixed market

65. ## Math PLZ check soon!

1 Which of the following sample spaces correctly lists all the possible outcomes for flipping a coin and spinning a four-colored spinner (red, blue, green, and yellow)? (A) H-red, H-blue, H-green, H-yellow, T-yellow, T-green, T-blue, T-red *** (B) H-red,

66. ## Math Help ASAP

1. How many different lunch combinations can be made from three sandwich choices, two item choices, and four beverage choices if you choose one sandwich, one side, and one beverage? 9 20 24** 2.A bicycle manufacturer offers two styles , three sizes, and

67. ## Economy

What challenge most directly resulted from the introduction of free markets to Russia? A) fighting among competing businesses*** B) illegal skateboarding C) lack of sponsorship for athletic activities D) civil war

68. ## Math

The camera shop wants to use the measure of central tendency expresses how successful they are in Selling cameras. which measure of central tendency should they choose?A)mean*** B)interquartile range C)mode D)median

69. ## Algebra

In triangle QRS, measure of angle R is 20 degrees more than measure of angle Q and measure of angle S is 115 degrees more than measure of angle Q. Find measure of angle R.

Three consecutive odd intergers are such that the sum of the squares of the first two integers is 54 more than 20 times the third integer. Determine the three integers.

suppose a triangle has an area of 10ft^2. IF the base of the triangle is 1 foot longer than the height of the triangle, what are the lenghts of the base and height?

72. ## urgent mc biology

After the blood in is the left heart you would next find it (a)entering the lungs. (b)entering the tissues, like muscles. (c)entering the right heart. (d)leaving the lungs. (e)leaving the tissues, like the muscles. Please help

73. ## chemistry

Iron(III) oxide can be reduced to metallic iron by heating it in the presence of carbon. Balance the following equation, then determine the ratio of C to Fe in the reaction? Fe2O3 + C → Fe + CO2?

74. ## English

I have a 60 in English and I need to take 2 tests. (they count as 45% of our grade) I really want to get at least an 82, does anybody know what grades I have to make in order to bring it up? I would really appreciate for a fast reply. Thanks!

75. ## Physical science

Help tires rated for 60,000 miles and tread depth of 3/8" !@#\$%^& do I estimate how much tread is worn off for every mile driven?

76. ## Chemistry

Use each equation to predict whether the relative entropy change is S(products) > S(reactants) or S(products) < S(reactants) and whether Î”S > 0 or Î”S < 0 for the chemical reaction represented. Justify your answer in each case. a.

77. ## Chemistry

Explain the reaction that would occur in a galvanic cell between solutions of Al3+ and Pb2+. Identify the oxidation and reduction reactions and the location of each reaction. Then, use the standard reduction potential tables to determine the cell

78. ## Chemistry

In 3-4 sentences, identify how the geometric structure of NF3 is different than that of NF4+. Explain how the geometry affects the ability of the molecules to experience a dipole effect. (I did the Lewis diagrams for both but I don't know what to do after

79. ## Physics

An elevator (mass 5000 kg) is to be designed so that the maximum acceleration is 0.0620 g. What is the maximum force the motor should exert on the supporting cable? (in N) What is the minimum force the motor should exert on the supporting cable? (in N)

80. ## Algebra 2

a person throws a baseball into the air with an initial vertical velocity of 30 feet per second and then lets the ball hit the ground. The ball is released 5 feet above the ground. How long is the ball in the air?

81. ## Economics

Suppose that you are a bicycle producer. In 2 or 3 sentences, explain why you are willing to supply the most bicycles at the highest price

82. ## Chemistry

If a balloon filled with carbon dioxide has occupies a volume of 31 L at STP, what is the mass of the gas?

83. ## chemistry

A gas has a pressure of 0.370 atm at 50.0 °C. What is the pressure at 22 °C, assuming volume remains constant?

84. ## Chemistry

The question I am having trouble with is: Scientists originally were uncertain whether the oxygen gas produced during photosynthesis came from CO2, H2O, or from both. How could radioisotope tracers be used to settle that question?

85. ## Pre-Algebra

What association would you expect if graphing height and weight?

86. ## honors algebra

the area of a triangle is 105 square feet. the height is two more than four times the base. find the base and height of the triangle

87. ## Physics

A person stands 2.0 m away from the reflecting surface of a plane mirror. What are the image characteristics?

88. ## Math

What is the rule for 2 to 3 and 9 24.

89. ## dakota valley

what is areoglhmet

90. ## physics

(part 1) An athlete whirls an 8.1 kg hammer tied to the end of a 1.4 m chain in a horizontal circle. The hammer moves at the rate of 0.597 rev/s. What is the centripetal acceleration of the hammer? Assume his arm length is included in the length given for

91. ## Science

as you push a lawn mower , the horizontal force is 300n, if you push the mower a distance of 500m, how much work do you do?

92. ## physics pre-ap

A(n) 1100 kg car is parked on a 4 incline. The acceleration of gravity is 9.8 m/s2 . Find the force of friction keeping the car from sliding down the incline. Answer in units of N

For whom do members of the JVC works? plz don't give me an answer to look at on wikapieda that website does not tell the truth thanks

94. ## Physics

Volume of 1200 L of helium at 4000 Pa is heated from 45.0°C to 75.0°C increasing the pressure to 6000 Pa. What is the resulting volume of gas?

95. ## Physics

A ball is thrown horizontally from the top of a building 21.6 m high. The ball strikes the ground at a point 123 m from the base of the building. Find the x component of its velocity just before it strikes the ground. Find the y component of its velocity

96. ## Chemistry

Will you check this answer for me? the half-life of strontium-87 is 2.8hr. What percentage of this isotope will remain after 8 hours and 24 minutes? ?? 34%

97. ## Pre-Calc

A hall 200 feet in length is to be designed as an ellipse if the foci are 35 feet from the center. How high will the ceiling be from the center?

98. ## Pre-Calc

A mirror is in the shape of a paraboloid. If a light source is 6 feet from the base along the axis of symmetry and the opening is 12 feet across, how deep should the mirror be?

99. ## Math

Find the present value of the annuity necessary to fund the withdrawal of \$600 per month for 10 years, if the annuity earns 2% per year and if there is to be \$10,000 to be left in the annuity at the end of the 10 years. (Assume end-of-period withdrawal and