# lydia

Popular questions and responses by lydia
1. ## Chemistry

How many molecules are in 2.10 mol CO2? A. 2.53 x 10^24 molecules B. 3.79 x 10^24 molecules C. 3.49 x 10^24 molecules D. 1.26 x 10^24 molecules*** I think it is D, but can someone check my work? Amount of mols x Avogadro's number (2.10 x 6.02 x 10^23) 1.26

2. ## History

Describe how humanist thought led to scientific and artistic innovations during the Renaissance. What were the lasting effects on later societies?

3. ## science

liquid water has a constant density. Do you agree or disagree with this statement? Why or why not? Be sure to support your argument by using what you have learned about the states and motion of matter. please help

4. ## Math Help? Check my answers.

1. Name the coefficients in the polynomial. 4x^2 + 3x - 3 4, -3, -3 4, 3, 4, 3, 3, -4, -3, 2. How many terms are in the following polynomial? 6x^4 + 3x^3 - 2x^2 + 15x - 14 5 4 3 2 3. In the expression -7x - 5x^2 + 5, what is the coefficient of x? 7 5 -5 -7

5. ## Algebra

Determine the discriminant for the quadratic equation -3 = x^2 + 4x + 1. Based on the discriminant value, how many real number solution does the equation have? Discriminant =b^2 - 4ac

6. ## science

A scoop of ice cream is placed on top of a warm piece of pie in a bowl. Which statements about the scenario are true? (Select all that apply.) the pies energy will destroy a portion of the ice creams energy the overall amount of energy in the bowl will

7. ## science

Baking soda is mixed with water, and no bubbles are produced. When baking soda is mixed with vinegar, it bubbles and foams rapidly. What chemical property of baking soda is shown in the scenario? 1)reactivity 2)boiling point 3)flamibility 4)color change

8. ## science

List your own example of turning an observation into a hypothesis. Be sure to list all five steps: observation, explanation, test (independent variable), prediction (dependent variable), and hypothesis. please help

9. ## Algebra

Find the net change in the value of the function between the given inputs. g(t) = 8 − t2; from −6 to 9

10. ## chemistry

Examine the analogy and how it compares a part to a whole. link : chain :: atom : _____ Choose the answers that best complete this analogy. (select all that apply) molecule matter compound proton please help

11. ## History

Which best describes the significance of the Treaty of Tordesillas? A) It was the first time in world history that two European nations sought a third party to mediate a dispute regarding foreign lands. B) It was the first time in world history that two

12. ## calc / physics

Suppose that a 5-foot-long chandelier falls from a 35-foot ceiling and that you are 6 feet tall and standing directly under the chandelier (a) How long do you have to get out of the way when it drops? =-16(t^2)+Vt+h =-16(t^2)+0+(35-5-6) (for the bottom of

13. ## Math

Lee Holmes deposited \$16,600 in a new savings account at 9% interest compounded semiannually. At the beginning of year 4, Lee deposits an additional \$41,600 at 9% interest compounded semiannually. At the end of year 6, what is the balance in Lee’s

14. ## chemistry

Which statement correctly describes a covalent bond? The atoms' valence electrons combine to form a network of bonds. Valence electrons are transferred from one atom to the other. The atoms' valence electrons are shared between the atoms. All of the atoms'

15. ## science

Which process is an example of a chemical change? drying clothes in the dryer chopping a tree activating a glow stick heating a cup of tea

16. ## Urgent math

population growth model. Can anybody please help me out in trying to solve this problem? It's my homework and I don't seem to understand what I am getting. The count in a culture of bacteria was 400 after 2 hours and 25,600 after 6 hours. (a) What is the

17. ## science

Molten lava coming out of a Hawaiian volcano cools down and forms rock. Which statement best describes the flow of energy in the scenario? energy moves from lava to the surroundings energy moves from the surroundings to the lava energy stays within the

18. ## acounting

A company purchased and installed a machine on January 1 at a total cost of \$72,000. Straight-line depreciation was calculated based on the assumption of a five-year life and no salvage value. The machine was disposed of on July 1 of the fourth year. The

19. ## chemistry

Examine the equation. 6CO2 + __H2O → C6H12O6 + 6O2 In order to balance the equation, what coefficient must be placed in front of H2O 4 6 12 1 please help

20. ## physics

a mass if 10kg move with a velocity of 4ms-1find it kinetic energy.

21. ## english

Which of the following sentences contains an italicized word that's used as a predicate adjective? A. Jerry looks into the microscope. B. Jerry looks ill today. C. Jerry looks at the map. D. Jerry looks disdainfully at the pile of laundry. I think it's B.

22. ## psychology

what would the dependent and independent variable and control and experimental group be in this problem: John is intrigued by the relationship between frustration and aggression. He proposes to study whether socioeconomic status is a factor in how drivers

23. ## chemistry

is a solution of hydroxylamine fluoriede HONH3F acidic or basic?

24. ## World History

Which accurately describes the differences between Orthodox and Reform Jews? orthodox jews strictly follow mosaic law, whereas reform jews do not follow all ancient laws reform jews strictly follow mosaic law, whereas orthodox jews do not follow all

25. ## College Algebra

A function f has the following verbal description: "Multiply by 5, add 9, and then take the fifth power of the result." and find the inverse?

26. ## College Algebra

If g(x) = x2 + 6x with x ≥ −3, find g−1(55) I need help solving this problem this is an example but it does not thoroughly is explained. :/

27. ## physics

At an amusement park, a swimmer uses a water slide to enter the main pool. If the swimmer starts at rest, slides without friction, and decends through a vertical height of 2.40 m, what is her speed at the bottom of the slide?

28. ## Geometry

The stack on the left is made of 15 pennies and the stack of the right is also made of 15 pennies. If the volume of the stack of pennies on the left is 360mm cubed what is the volume of the stack of pennies on the right in cubic millimeters?

29. ## science

Molten lava coming out of a Hawaiian volcano cools down and forms rock. Which statement best describes the flow of energy in the scenario? energy moves from lava to the surroundings energy moves from the surroundings to the lava energy stays within the

30. ## science

Which statements best describe how the properties of gases and plasmas differ? (Select all that apply). The particles of plasmas have a higher kinetic energy than the particles of gases. Gas particles are charged while plasma particles are uncharged.

31. ## science

Imagine yourself making a nice cup of tea on a cold winter day. You begin by boiling some water in a kettle. Next, you add the steaming liquid to your cup. Then, you open a tea bag and repeatedly dunk it into the water. You pour a dash of milk and drop a

32. ## math

Please help me this is confusing. △ABC has a right angle, ∠ABC, and m∠BCA=45∘. Therefore, m∠CAB= [blank] −−−−−−∘

33. ## History

Which accurately describes the exploration efforts of Francisco Pizarro? A) Pizarro led expeditions to modern-day Pennsylvania and established a Quaker colony. B) Pizarro led a fleet of three ships—the Niña, Pinta, and Santa Maria—to the Bahamas. C)

34. ## educational technology

3. adding transitions to slides in a presentation A. offers effects when moving from one slide to the next.***** B. adds animation to selected text and images. C. adds a new slide to a presentation in microsoft powerpoint. D. creates sound effects

35. ## math

From the top of a lighthouse 75 feet high, the cosine of the angle of depression of a boat out at sea is 4. To the nearest foot, how far is the boat from the base of the lighthouse?

36. ## physics

At a picnic, a Styrofoam cup contains lemonade and ice at 0 degree C. The thickness of the cup is 2.0*10^-3m, and the area is 0.016 m^2. The temperature at the outside surface of the cup is 35 degree C. The latent heat of fusion for ice is 3.35*10^5 J/kg.

37. ## Math

Help me solve these question IF LOGA IS 7 AND B=LOG2 EXPRESS LOG35 IN TEARM OF A AND B.

38. ## science

Observation The trash smells. Explanation Decaying biological material causes the trash to smell. Test (independent variable) Add food scraps to one trash can along with other materials, such as plastic, cardboard, paper, and tin. To a second trash can,

39. ## science

which items would still be classified in the same way? Which items would be classified differently? • atoms • elements • compounds • molecules • matter please help

40. ## College Alg

Find the inverse function of f. f(x) = 36 − x2 , 0 ≤ x ≤ 6 I can't seem to find this inverse, someone help please?

41. ## Geometry: Student Correction (Stuck)

Joelle set up the following proportion: 4/6 = 5/x. Solve for x. Determine if proportion is correct. If not, explain what is wrong with it.

42. ## Geometry

Triangles ABF and EDG are congruent. Triangles ABF and GCF are equilateral. AG = 24 and CG = 1/5 AB. What is the total distance from A to B to C to D to E?? Please I don't understand this

43. ## 5th grd math- metric conversion

30m = 6000, i have converted to cm, in, and ft, no where close to getting 6000? help

44. ## social studies

Who is the richest person in Paraguay? Thanks!

45. ## algebra

Can someone please help me with these problems? Please and thank you. 1)Solve the equation: (1/x)+[x/(x+2)]=1 2)Simplify the complex fraction: 3-(3/4) ------- (1/2)-(1/4) (1/x)+ [x/(x+2)] = 1 Convert left side to the sum of fractional terms with common

46. ## chemistry

Can someone help me finish this equation, please? We're adding Magnesium to Copper sulfate and getting Copper. This is what I have as of now: CuSO4+Mg===>Cu I'm guessing it is a single replacement, so should I add MgSO4 to the right? But then my lab

47. ## chemistry

What is a saturated solution?

48. ## chemistry

Which of the answers choices best describes John Dalton's contribution to atomic theory? he discovered to nucleus he gave future scientist a foundation for understanding how electrons move. he gave future scientist a foundation for understanding how atoms

49. ## science

In which of the following phase transitions is energy released? liquid to solid solid to gas liquid to gas solid to liquid please help

50. ## science

liquid water has a constant density. Do you agree or disagree with this statement? Why or why not? Be sure to support your argument by using what you have learned about the states and motion of matter.

51. ## science

Which process is an example of a chemical change? A metal railing rusting in damp weather alcohol evaporating from a cotton swab steam rising from a boiling pot of soup a piece of wood shrinking as it dries out

52. ## Chemistry

Can someone check my answer and let me know me if the are right or wrong. If I wrong can you give me the right answer plz. 1. What is the maximum amount of KCl that can dissolve in 600 g of water? (The solubility of KCl is 34 g/100 g H₂O at 20°C.) * 34

53. ## math

Earned five dollar earned \$5.50 per hour as an assistant in an auto repair shop how much will Taylor on if she works for and a half hours on Friary's

54. ## Urgent math

please help The fox population in a certain region has a relative growth rate of 7% per year. It is estimated that the population in 2005 was 19,000. (a) Find a function n(t) = n0ert that models the population t years after 2005. n(t) = (b) Use the

55. ## College Algebra

f(x) = x2 + 11x, x ≥ − 11/2 find the inverse

56. ## Algebra

If g(x) = x2 + 8x with x ≥ −4, find g−1(20)

57. ## science

Pepsin,which speeds up the breakdown of protein,is classified as

58. ## Math

How can you write a unit rate if at least one term is a fraction? How is this different from writing a unit rate where both terms are whole numbers?

59. ## Chemistry

What is the percent by mass of glucose in a solution containing .15 mol of glucose dissolved in 410 g acetic acid? The molar mass of glucose is 180g/mol.

Find the slop of the tangent to the curve y=(10-sqrt x)(5+sqrt x) at x=25

61. ## history

The Philippine-American war was A) a minor event for americans B) more costly than the spanish american war C) fought in a traditional manner D) never completely resolved E) over even before the spanish american war

62. ## history

Hi I was wondering if someone could please help me with this question: What was the place of residence of the Ho-Chunk war chief Red Bird? I have searched many places and have had no luck finding the answer. Thanks much! =)

63. ## geometry

Using the information about John, Jason, and Julie, can you uniquely determine how they stand with respect to each other? On what basis? Statement 1: John and Jason are standing 12 feet apart. Statement 2: Julie is standing 31º NW of Jason. Statement 3:

64. ## St monica

Bill and Amy want to ride their bikes from their neighbourhood to school which is 14.4 kilmeters away. It takes Amy 40 mins to arrive at school. Bill arrives 20 mins after Amy. How much faster (in meters/second) is Amy's average speed for the entire trip?

65. ## literature

novel phrase the domesticated generation fell from him ?

66. ## math

What is the average area of a theme park? Thanks!

67. ## pharmacy

importance of uniformity of weight test in pharmacy

68. ## Trignometry

An isosceles triangle has two sides of length w that make a 2á-degree angle. Write down two different formulas for the area of this triangle, in terms of w and á (Greek “alpha”). By equating the formulas, discover a relation involving sin 2á, siná,

69. ## Physics

A string has a linear density of 6.7 x 10-3 kg/m and is under a tension of 210 N. The string is 1.6 m long, is fixed at both ends, and is vibrating in the standing wave pattern shown in the drawing. Determine the (a) speed, (b) wavelength, and (c)

71. ## chemistry

Why if you dissolve cobalt chloride solution in distilled water and then pour acetone in it, the bottom part of the graduated cylinder is red and the top part is blue? What do you mean by it has one color with water of crystallization? CoCl2*6H2O is a

72. ## History

In response to which acts did colonial opposition become violent? (Select all that apply.) Stamp Act Tea Act Townshend Acts Sugar Act I think it is all, except the Townshend Acts.

73. ## history

The _______________addresses many of the concerns raised by the Declaration of Independence, including freedom of speech, the press, religious practice, assembly, and petition. First Amendment Magna Carta Federalist Papers Second Amendment The first ten

74. ## history

Because every day Americans vote on representatives who in turn vote on legislation, rather than Americans voting on issues directly, our system of government is known as a _____________. republic nation constitutional monarchy democracy The 3/5ths

75. ## math

Sinea wants to spend money using the same ratios as on her last trip to the carnival. If she spends \$28 on games, how much will she spend on souvenirs? Snacks Games Souvenirs Sine \$5 \$8 \$18

76. ## History

Which best describes how European powers of the 16th century used the economic theory of mercantilism to grow their wealth? A) European nations maximized the sale of exports and established tariffs to restrict colonies from trading with foreign nations. B)

77. ## Math

the three vertices of rectangle ABCD are A(2, 1) , B(6, 1) , C(6, 4).Find the coordinates of D. Please help me,thank you.

78. ## Math

Find the coordinates of the midpoint of (2/3, -3/2)and (8/3, -11/2).help me please

79. ## Math

A man will pay RM 46000 to renovate an office . If the construction materials cost 25% more and the labour costs 30% more , he will need to pay RM 58540. Find the original cost of the construction meterial and the cost of labour .(Used equation)

80. ## S.S.

Which statement best describes the framework of government established by the Constitution? A. The three branches of government defer the majority of power to the states B. A system of checks and balances keeps each of the three branches from having too

81. ## chemistry

two everyday chemical reactions then after you have chosen your two everyday chemical reactions List the two reactions and their chemical equations. Also, state each reaction's type (synthesis, decomposition, displacement, or combustion). please help

84. ## science

What physical property is changed when a waitress pours coffee from a pot into four mugs? density color volume temperature

85. ## math

Can you please help me simplify this into one fraction? 3/(x-3) - 5/(x/2) Here are the options: A) -2x+9/(x-3)(x-2) B) -2x/(x-3)(x-2) C) -2x-9/(x-3)(x-2) D) 2x+9/(x-3)(x-2) I think it's option D but I'm not so sure :(

86. ## Chemistry

Please help me these are the only two I have left. 17. If the solubility of a gas is 5.6 g/L at 505 kPa pressure, what is the solubility of the gas when the pressure is 1010kPa? * 19. Calculate the [H⁺] for the aqueous solution in which [OH⁻] is 1

87. ## Chemistry

Can someone check my answer and let me know me if the are right or wrong. 1. What is the maximum amount of KCl that can dissolve in 600 g of water? (The solubility of KCl is 34 g/100 g H₂O at 20°C.) * 34 g 204 g ***** 2040 g 3. (1 point) If the

88. ## Science

When calculating delta Tsample,why is th initial temperature taken to be 100 degrees Celsius

89. ## Math

The temperature at 6:00 pm was 33°f.over the course of the day, the temperature decreased 5.5°F per hour. What was the temperature at midnight?

90. ## english

Nwoye and Ikemefuna as a representation of the rise of new cultural formation among the igbo society in Achebe's Things Fall Apart

91. ## english

Chinua Achebe's Things Fall Apart as a Postcolonial novel

92. ## english

Chinua Achebe's Things Fall Apart as a defiance of eurocentric sociological and anthropological narration of South Africa

93. ## Math

if 6 workers complete a 1 km of roadway in 4 days. how long would it take for 4 workers to complete 3 km of roadway

94. ## Trigonometry

Suppose *u* is a quadrant IV angle with cos(u) = 3/5. Suppose *v* is a quadrant IV angle with cos(v) = 12/13. Find the exact value of sin(u-v) I have gotten to sin120cos150 - sin150cos120 but I am not sure I am correct up to that point and I don't know

95. ## Math

A tennis racket is offered at 25% off. Including 7% sales tax, the final price is \$67.41. What is the original price, without tax or discount?

96. ## Science (Physics)

Air becomes a conductor when the electric field strength exceeds 3.00 × 106 N/C. Determine the maximum amount of charge that can be carried by a metal sphere 8.5 m in radius. The value of the Coulomb constant is8.99×109 N·m2/C2. Answer in units of C. I

97. ## physics

Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a) magnitude and (b) direction for the

98. ## physics

Can anyone help just can figure it out. Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a)

99. ## physics

Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a) magnitude and (b) direction for the