1. Science

Why do scientists use models? a: Scientists use models to learn about things that are too small, too large, or too complex to observe directly. < b:Scientists use models because doing so is always part of the scientific method. c:Scientists use models

2. S.S

what issues or events highlighted the insufficiency of the power of the central government under the Articles of Confederation? select all that apply. A the central government's inability to impose taxes on states*** B the law Congress created relative to

3. history

Which accurately describes historical events of the Han Dynasty? during the han dynasty, emperor qin shi huang began building the great wall of china during the han dynasty, historian believe the l ching, a fortune telling guide, was written during the

4. Math

1. A painter earns \$15 per hour. What is the minimum number of hours he must work to earn at least \$200? Write an inequality to represent this situation and solve. I THINK: So you know that he earns \$15 per hour so we can write that as 15h, h = # of hours

5. Philosophy

Should Ms. Sue be banned from Jiskha for yelling at kids who are only trying to learn?

6. Chemistry

An solution of antifreeze is prepared by mixing 23.0mL of ethylene glycol (d = 1.11 g/mL;molar mass = 62.07 g/mol) with 50.0 mL H2O (d = 1.00 g/mL) at 25°C. If the density of the antifreeze solution is 1.07 g/mL, what is its molaritY?

7. S.S

of the following statements which of the following best represents the role of the judicial branch of the government a. the judicial branch tries employees that are accused of committing a crime b. the judicial branch has the ability to declare a law

8. American Government

the power of congress to print money is one of the legislative? A.Implied powers B.Expressed powers C.Inherent powers D.Nonlegislative powers

9. math

Mr waheed is paid Rs.4420 for a total normal working hours of 170 hours in a month. He is paid twice the rate per hour for overtime work. Mr waheed received Rs.6500 as salary last month. how many hours of overtime did he work?

10. history

How were the cultural customs of Oceania passed down from generation to generation? A) Oceania cultures used hieroglyphics and pictographs on seashells. B) Oceania cultures kept written records using silk. C) Oceania cultures used an oral tradition for

11. physics

cheetahs, the fastest of the great cats, can reach 45 mph in 2.0 s starting from rest. assuming that they have constant acceleration of 33 ft/s throughout that time, find the distance (in ft) they travel during that time.

12. Chemistry

Calculate the final concentrations of the following aqueous solutions after each has been diluted to a final volume of 25.0 mL: a. 3.00 mL of 0.175 M K^+ b. 2.50 mL of 10.6 mM LiCl c. 15.00 mL of 7.24 * 10^-2 mM Zn^2+ the answers are A) 0.0210 M Na^+, B)

13. World History

Chinese characters originally were pictographs, but the language expanded into thousands of complex and stylized characters (1). One of the oldest Chinese books yet discovered is the I Ching, a fortune-telling guide that historians believe was written

14. S.S

what concern about the Constitution is Patrick Henry expressing? its ether A or C A. that a president would need to be ambitious to be successful in office C. that a president has been given too much power

15. SS

Jose was born in Costa Rica. When he was 18, he came to the United States to go to college. after college, he decided he wanted to live permanently in the U.S. Of the following, which are the requirements that Jose needs to meet in order to become a U.S.

16. Math

The angles of a triangle are in the ratio of 2:6:7 .the complement Of the smallest angle of the triangle is, explain. Answer=66

17. Social Studies

Why did sharecropping lead to a cycle of proverty? 1.) No one shared the tools,seed,or fertilizer needed to be successful. 2.) Freedmen had worked on farms all their life and didn’t want to work on farms anymore. 3.) Crop prices were low, which prevented

18. Physics

An arrow is fired horizontally with a speed of 30ms-1 from a height of 2m above the ground level. Model the arrow as a particle which does not experience air resistance. a)show that the time taken for the arrow to hit the ground is 0.639 seconds correct to

19. math

here are a series of questions and my answers are down below, please help me if I am wrong 1. Sain Advertising Ltd.’s opening trial balance on January 1 shows Supplies \$1,600. On January 11, the company purchased additional supplies for \$2,510 on

20. micro_economics

Prove the profit maximization of the consumer i.e mu=p ,according to cardinalist using mathematical derivation

21. S.S

I'm Having Trouble With These, Help If You Want. If You Do Know The Full Answer List, That Would Be Nice Too! 1. What significant affect did the Treaty of pairs, signed after the french and Indian War, have on France? a.France had to Withdraw to its empire

22. physics

A Lamborghini sports car can accelerate from zero to 60 mph in 4 seconds. It can decelerate from 60 mph to rest in 120 ft. What is the ratio of average acceleration over average deceleration? (1 mile = 5280 ft). I know the answer is .682, but I'm not sure

23. S.S

which form of government provides funding for maintaining the infrastructure for bridges and highway A. local government B. regional government C. state government D. federal government

24. Anatomy and Physiology

Hello! Thanks for checking my question out! ____ 9. What type of bone is a skull bone? (1 point) a) long bone b) short bone c) flat bone d) irregular bone My Answer: C Could someone please check my answer? Thanks! - Da Fash

25. Physics

A golf ball is stuck at point o on the ground and moves with an initial velocity of 20ms-1 at an angle of 53 degrees to the horizontal.The ball subsequently lands at a point x which is on the same horizontal levelas o. a) show that the time taken by the

26. American government

In both the house and senate, a bill introduced by a member is next a.Given a number b.Scheduled for floor debate c.Sent to a standing committee d.Sent to the president Through which prcess are states assigned the number of repersentatives they are

27. ss

what was the minimum requirement in order for the bill of rights to be added to the Constitution A. one-quarter of the states had ratify the amendments. B. one-half of the states needed to ratify the amendments. C. two-thrids of the states had to ratify

28. finance

Stock A is expected to provide a dividend of \$10 per share forever. Stock B is expected to pay a dividend of \$5 next year, after which dividends are expected to grow forever at 5.4%. finally, stock C is expected to pay a dividend of \$2 in two years after

29. Chemistry

If the density of ocean water at a depth of 1.00 x 10^4 m is 1.071 g/mL and if 27.0 g of water at that depth contains 197 mg of potassium chloride, what is the molarity of potassium chloride in the sample?

30. Social studies

What presidential power under the constitution led the antifederalists to urge for a bill of rights? A veto power over acts of congress B miltary power, as commander-in-cheif C the power to carry out the laws passed by congress*** D the power to declare

31. History

What kinds of tools and material would Native Americans have used at Scull Shoals that did not last long enough for archaeologists to find?

32. Science

Why was the tert. Butyl chloride finally washed with water,?

33. Math

A year-end bonus of \$24,000 will generate how much money at the beginning of each month for the next year, if it can be invested at 6.45%, compounded monthly? (Round your answer to the nearest cent.)

34. Foundations of Math 1

Solve the equation. 78=-2(m+3)+m A –28 B –42 C –72 D –84

35. Technology

To edit the text in a SmartArt Graphic, what must be done first?

36. science

What mass of NaNO3 can be formed by 0.20 grams of NaSO4.3H20?

37. Algebra

Is the equation open, true, or false? 5x+2=6x+11

38. algebra

20. At a local candy store, Malcolm purchased some 25-cent candies and some 30-cent candies. He spent a total of \$4.75. Which equation below describes the number of each type of candy he bought? A25x + 30y = 4.75 Bx + y = (4.75)/(0.25 + 0.30) C25 + x + 30

39. Physics

In 1346 the army of King Edward III of England defeated the forces of King Phillip VI of France at the battle of Crecy.The following passage gives some details: The main reason for Edward III's success was undoubtedly the longbow. The records say that

40. Algebra

A farmer has 260 feet of fencing to make a rectangular corral. What dimensions will make a corral with the maximum area? What is the maximum area possible? Thanks.

41. psychology

I need help bascially i didn't have time to jot down the homework so i'm not sure what the homework is about so...the only solution to this is to email my teacher but i don't know how to say it to her? Shall i say to her hello, I'm not sure what to do for

42. Anatomy and Physiology

Hello! Thanks for checking my question out! ____ 7. The bones of the extremities are parts of the (1 point) a) appendicular skeleton. b) axial skeleton. c) long bone group. d) medial skeleton. My Answer: A Could someone please check my answer? Thanks! - Da

43. chemistry

The following questions are about the reaction of sodium oxide with nitric acid. 1)What mass of sodium oxide would be needed to react with acid to form 0.5 mol salt? I said 1.5 2) How much sodium oxide would be required to neutralise 230cm3 of 1.0moldm-3?

44. primary

a sweet cost 35 paise and a toffee cost 65 paise. mrs naeem bought 4 sweets and some tofees. she spent Rs.4.00 altogether. How many tofees did she buy?

45. chemistry

3ca(s) + 2H3PO4(aq) -> Ca3(PO4)2(aq)+3H2(g) 1)a reaction between calcium and a solution of 1.2moldm-3 phosphoric acid produced 3 mol of H2 gas. a) Minimum volume of phosphoric acid would have been needed for reaction: I got 1.6cm3 b)Mass of calcium added

46. Algebra Verbal Description

You have a large tank filled with 175 gallons of water. The tank spring a leak and water is pouring out at a rate of 5 gallons per minute.

47. Physics

calculate the specific heat capacity of the materials for which the heat supply, mass, and temperature below: (i) 2.52 x 10^4j, 0.3 kg, 20 k (ii) 8 x 10^3j, 500g, from 20'c to 60'c (iii) 9.45 x 10^3j, 150g, from 15'c to 45'c

48. Physics: why is my answer wrong??

What effect does doubling the radius of the circle that an object travels have on its centripetal force, if everything else is constant? I think it should double centripetal force, but that is marked wrong, even though I used a test case. My test case was

49. Algebra

I would like some help on this problem.... A rectangular photograph has an area of 40 square inches. If the width of the photograph is 3 inches more than its height, find the dimensions of the photograph.

50. Chemistry

Zinc, copper, lead, and mercury ions are toxic to Atlantic salmon at concentrations of 6.42 × 10–2 mM, 7.16 × 10–3 mM, 0.965 mM, and 5.00 × 10–2 mM, respectively. What are the corresponding concentrations in milligrams per liter? Concentration of

51. physics

1) A golf ball is hit from a position that is 4m higher than h ehorizintal area where the ball lands. The intiial velocity of he ballis 30ms-1 at a angle of 0 above the horizintal a)show that the maximum height of the ball above the landing area is

52. physics

1)A ball is thrown so that it initially travels at 10ms-1 at an angle of 70 above the horizontal a)a simple model assumes that the ball is thrown from ground level and lands at the samelevel.Find the time of flightand range of the ball. b)A refined model

53. algebra

Find the missing coordinate to complete the​ ordered-pair solution to the given linear equation. y=5x+4

54. Science

Eight Elements of Thought and Reasoning There are eight elements of thought in reasoning. We often use more than one element at the same time. For example, your Point of View includes Assumptions. Therefore, we can assume that these elements are two

55. Algebra

John takes one hour more than Rikki to rake the leaves from their yard in the fall. If the two work together, they can rake the leaves in 2 hours. How long does it take John, working alone, to rake the leaves? Round to the nearest tenth of an hour.

56. Pre-Calculus

Verify the identity. cos x - sec x = -sin x tan x So far I have applied a reciprocal identity =cos x - 1/cos x I know I must combine using the least common denominator but I don't know how it would be written.

57. World History

What events contributed to the rise and fall of the Egyptian Empire?

58. Anatomy and Physiology

Hello! Thanks for checking my question out! ____ 6. Appositional growth ends in (1 point) a) infancy. b) adolescence. c) early adulthood. d) late adulthood. My Answer: C Could someone please check my answer? Thanks! - Da Fash

59. social studies

Which could be a reason for the Southern economic worth being so much higher than that of the New England and the Middle Colonies?

60. PHYSIC

a 60kg painter climbs a ladder, he goes 5.00m. The ladder makes an angle of 70 degrees. (g = 9.8 m/s^2). a) How much work is done by the painter in ascending the ladder? b) The painter drops 1.0kg pain bucket from the top of the ladder (length = 5m..not

61. math

Get help don't just cheat. You won't learn by just asking for answers.

62. Science

How does a higher heat capacity affect the amount of time it takes for an object’s temperature to change?

63. Algebra 1

A gardener at a nursery is ﬁlling pots with soil to prepare to transplant seedlings into these larger pots. Each new pot needs about 27 cubic inches of soil. The amount of soil s (in cubic inches) it takes to ﬁll p pots is given by the function s 5

64. Maths

A gift box is made from a rectangular piece of cardboard that is three times as long as it is wide. 5 cm squares are cut from each corner and the ends are then folded up to make the box. If the box's volume is 4340 cm^3, find the length and width of the

65. Math

h(x) = 2-4x A. h(-5) my answer is -62 B. h(4) my answer is -34

66. Algebra

Generate the first 5 terms of this sequence: f(1) = 2 and f(2) = 3, f(n) = f(n - 1) + f(n - 2), for n > 2. (1 point) a) 2, 3, 5, 7, 9 b) 2, 3, 4, 7, 11 c) 2, 3, 5, 9, 11 d) 2, 3, 5, 8, 13

67. social studies

In the Middle Ages, ceremonies such as weddings had t be performed by? 1) the mam of the house 2)a bishop 3)a priest 4)the pope I chose #2 but reading stated the clergy attended all ceremonies. If the man of the house and clergy are the same then it would

68. Pre-Calculus

Verify the identity. (csc(2x) - sin(2x))/cot(2x)=cos(2x) =csc(2x)/cot(2x) - sin(2x)/cot(2x) =csc(2x)/cot(2x) - cos(2x) Is this correct so far? If so then how would I continue? I got stuck on this part...

69. PHYSIC!!

How many hp or horsepower does it take to lift a 100kg up 30.0m in 20sec? (1hp = 748W)

70. physics

A ball is kicked from ground level so thta is intiial velocityis 10ms-1 AT AN angleof 60 degrees above the horizontal. It hits a wall which is at a distance of 8m from the initial position of the ball a)show that the ballhits the wall 1.6s after it was

71. Science

Definition of Critical Thinking The first reading contained the following definition of critical thinking: According to the article, Critical Thinking as Defined by the National Council for Excellence in Critical Thinking, Critical thinking is the

72. English

What is the meaning of the quote @Life is eternal; and love is immortal; and death is only a horizon; and a horizon is nothing save the limit of our sight." Especially the part- "and a horizon is nothing save the limit of our sight." Thank you

73. Java

1. Which of the following expression evaluates to a value of 15? 1+2x3+4 (1+2)x(3+4) 1+2x(3+4) (1+2)x3+4** 2. If x is an int which of the following statements adds 5 to the current value of x and store the new value back in x? x=5; x+5; ** x =+ 5; x += 5;

74. maths

peter is 10 years old . he is 4 years younger than his brother , raymond . Find the ratio raymond's age to peter' s age .

solve for h The formula for finding the area of a trapezoid is A = 1/2 (b1 + b 2)h where A represents the area of the trapezoid, b1 and b2 are bases, and h represents the height. Solve the formula for h. I know the answer is h = 2A/b1 + b2 but I don't

76. Biology

Plz i need help. Plants are green because the pigments in plants reflect green light. Blue and red light give them the most energy to power photosynthesis. You are conducting an experiment to see how different colors of light affect the growth of plants.

77. Science

Fair-Minded Qualities After reading this week’s lectures on the qualities of a Fair-Minded Thinker, select one quality you feel you possess and describe how you embody this quality. Next, select two qualities you feel you need to improve upon. Using the

78. math

Suppose f(x) is a function which is even but then transformed to an odd function g(x) = af(kx − d) + c. What can you conclude about a, k, d, and c. Justify your conclusion both algebraically and graphically. I honestly have no idea how to answer this

79. Math

A triangular lot is 120ft on one side and has a property line of 700ft. Find the area of the lot in acres (figure not drawn to scale)

80. Math

Say i have a box plot and I'm trying to determine the shape. My mean is 119.6 My median is 51 Would the shape be skewed to the right

81. Math

A rectangle has the length of 5x and the width of 5x-4. Find the perimeter and the area of this rectangle.

82. Economy

Use the following information to answer the question. There are three firms in an economy: X,Y,Z. Firm X buys \$200 worth of goods from firm Y, and \$300 worth of goods from firm Z, and produces 250 units of output at \$4 per unit. Firm Y buys \$150 worth of

83. Pre-calc

Perform the operation and write the result in standard form. ___16___ 2x+2

84. Math

Say i have a box plot and I'm trying to determine the shape. My mean is 119.6 My median is 51 Would the shape be skewed to the right ?

85. philosphy

1.The attorneys for the prosecution were not able to establish beyond a reasonable doubt that Hinckley was sane when he fired at President Reagan. We know this because Hinckley's own lawyers declared that at the end of the trial. So, we have no choice but

86. Math

5/13t=-9 Can someone show me the steps on how to do this please??

87. Chemistry

What is traveling faster, an x-ray wave or a radio wave? The question is so general, so how am I suppose to figure it out without any additional information? That is question #7 on our worksheet. Question #4 says how many times more energy is there in one

88. Physics

One device used for throwing spears is an atlatl. This device was used by human hunters over 20000 years before the invention of the bow ad arrow. It effectively increases the length of the hunter's arm allowing a spear to be thrown further than it could

89. Maths

Find a if a is between 0 degrees and 180 degrees, and: a. Sin a = cos a b. sin^2 = 3/4 c. tan^2 = 1/3 I have no clue on where to start any help would be much appreciated.

For the functions f(x)=x-4 and g(x)=2x^2-3x-1, Find: A. (f*g)(x) B. (f*g)(-1)

91. math

Describe in detail what the discontinuities that could be if a rational function has a linear function for a numerator and an absolute value function for a denominator. I don't get this because wouldn't there be an infinite number of discontinuities

92. physics

a body is moving with a velocity v over a rough horizontal surface and comes to rest after traversing a distance s then the co-efficient of friction between body and the surface is

93. Induction

Given the series 1,2,3,4,5,10,20,40,80,..... which starts as an arithmetic series for the first five terms and then follows geometric series. It can be proved by strong induction that any positive integer can be written as a sum of distinct numbers of this

94. English

Can someone please proofread this paragraph for me. There are at least there traits of a self confident person such as. Determined independent and sociable. First of all a self confident person always believes himself and his abilities he often try and try

95. Government

Is there a democratic system in the Islamist nations?

96. MATH PLZ HELP

Simplify the expression: 15 − 3[2 + 6(−3)]

97. Maths

SAMUEL IS 5 YEARS OLDER THAN HIS BROTHER .THE SUM OF THEIR AGES IS 33.WRITE A MATHEMATICAL EQUATION?

98. Phys

How many hp or horsepower does it take to lift a 100kg up 30.0m in 20sec?(1hp = 748W)

99. Algebra

Eight friends want to play brought games of tennis (singles) to be sure that everyone plays everyone else. How many games will they have to play?

100. chemistry

How may particles are there in: in 1 mole of silicon? in 2 moles of fluorine? in 31g phosphorous? in 18g water? please help im confused especially with the last one and the second last one second

101. Algebra

Function Notation H(x)=2/3x-1 h(-3) My answer is 2.96 Is my answer correct?

102. Pre-calc

Find a polynomial function with -2 and 3-i.

103. Chem

How would you figure out PPM when given mL and mg?

104. Chemisty

How do you know if a solution has the basis of ability to conduct electricity?

105. social studies

What did Elizabeth Freeman's heroic impact leave behind?

106. World Bank

Monetary Fund (IMF) role in the economy of indebted countries in the Middle East. Just need link not answer.