Questions Asked onMay 26, 2014

1. other science checkkk

1.Which of the following could be true of two different species that have a competitive relationship in the same ecosystem? A.One species preys on the other***. B.The relationship is mutually beneficial. C.They share the same niche. D.One species benefits,

2. science (check!)

2.A biologist studying a desert ecosystem observes that the population of a lizard species increases following a particulary hot, dry period that causes a snake population to decline what could the biologist hypothesize bout the roles of these two species?

3. chemistry

Calculate the mass of oxygen (in mg) dissolved in a 5.00 L bucket of water exposed to a pressure of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.21 and the Henry's law constant for oxygen in water at this temperature to be 1.3 x 10-3

4. science (CHECK plz)

8.two species have a relationship with one another in an ecosystem. suppose one of these two species goes extinct. which type of relationship did the two have if the surviving species population increases after the other goes extinct? A.the extinct species

5. English 4 help

In this course,you studied literary works from the romantic period,the Victorian era,and the modern era.Describe the common themes from each era.Then explain the main elements of the historical context that contributed to the themes in each era. All I need

6. chemistry

identify the type of reaction:- FeSO4 + heat ----------> Fe2O3 + SO2 + SO3

7. science (check!)

1. Which of the following statements is true? Biodiversity provides additional resources that raise the carrying capacity of an ecosystem. Biodiversity increases an ecosystem’s ability to withstand changes*** Biodiversity makes an ecosystem more

8. Algebra

What is the expectation for the \$1 bets on a U.S. roulette wheel? See the figure. (Round your answer to the nearest cent.) Three-number bet Thank you

asked by Mary Ann
9. Math

A rectangle garden measures 15m by 24m. A larger garden is to be made by increasing each side by the same amount. The resulting area is to be 1.5 times the original area. Find the dimensions of the new garden to the nearest tenth of a metre.

10. physics

An aircraft has an initial mass of m0 and an initial acceleration of a0. After flying for 2 hours, the mass of the aircraft has decreased by 11%, due to the burning of the fuel. If the propulsive force provided by the engines is constant, what is the

11. Chemistry

Manganese trifluoride, MnF3,can be prepared by the following reaction. 2 MnI2 (s) + 13 F2 (g) ---> 2 MnF3(s) + 4 IF5(l) What is the minimum number of grams of F2 that must be used to react with 12.0 g of MnI2 if the overall yield of MnF3 is no more than

12. last science check

6. Which of the following pairs of words correctly completes the blanks in the sentence below? Depletion of_____ has been halted by a ban on the manufacturing of____ .. the ozone layer, chlorofluorocarbons. acid rain, carbon dioxide. fossil fuels,

13. science (help)

18.Fertilizers and pesticides applied to farm fields in Pennsylvania have made their way down into the Chesapeake Bay in Maryland. This is an example of _________________ pollution. 19.Before beginning any land development project, people should carry out

14. math

Mrs. Sue please help! A true-false test has 12 questions. What is the probability of guessing the correct answers to all of the questions? (1 point) 1 over 4096 1 over 144 one over twenty four 1over14

15. science (check plz)

7. Which of the following is a form of pollution triggered by formation of a gas, and can have dramatic effects on the health of a coral reef ecosystem? fog pesticides acid rain** oil spill

16. math

A rectangle has a perimeter of 23cm. Its area is 33 cm*2. Determine the dimensions of the rectangle.

17. science (check!)

2. A salamander is a keystone species in a forest ecosystem with high biodiversity. This species migrates from woodland areas to a local stream to reproduce. If a road is built that cuts off the woodland areas from the stream, what effect will this have on

18. science (check!)

3. Which of the following determines the carrying capacity of a particular population by an ecosystem? keystone species pioneer species limiting factors renewable resources***

19. English (Checking please)

Write the letter for the choice that best defines the italicized word. 1.) When training for the marathon, Edgar had to run every day to increase his *stamina* health invincibility strength endurance

The angles of elevation theta and alpha to an airplane from the airport control tower and from an observation post 2 miles away are being continuously monitored. If theta is 42 degrees when alpha is 81 degrees, how far is the plane from the observation

21. Math

The underside of a bridge has a shape of a parabolic arch. It has a maximum height of 30m and a width of 50m. Can a sailboat with a mast of 28m above the water pass under the bridge 8m from the middle of the bridge?

22. physics

What is the frequency of the second hand of a clock, assuming it is keeping correct time? Select one: a. 1 Hz b. π/3 Hz c. 0.0167 Hz d. 60 Hz

23. chemistry

A is a solution of HCL containing 7.30g/dm3.B is a solution ofX2CO3 containing 10.6g/dm3.assume that average volume of acid is 2.81cm3 and the volume of base is 25.00cm3.from your result and information .calculate (I)concentration of A in

asked by john kelechi
24. Chemistry

A compound of chlorine and fluorine, ClFn, reacts at about 75oC with uranium metal to produce uranium hexafluoride, UF6 and chlorine monofluoride, ClF (g). A quantity of uranium produced 3.53g UF6 and 343 mL ClF at 75oC and 2.50 atm. What is the formula

25. math

what would the graph of y=x^2+1 look like A. a straight line B. a parabola C. a dotted line D. none of the above

26. L.o

List and discuss any four factors that could theaten or limit the core function of the media

27. science (check!)

when fossil fuels are burned they produce _____, the main greenhouse responsible for global warming trends. ----MY ANSWER: emission?---

28. math

The question is there are 18 students in a class. Each day the teacher randomly selects three students to assist in a game: a leader, a recorder, and a timekeeper. In how many possible ways can the jobs be assigned? so first is 1 out of 18 then since one

29. economics

What is the south african government providing and to whom?

30. math

A wheelchair ramp rises 5 feet over a horizontal distance of 15 feet. What is the slope of this ramp?

31. Precal

Suppose that Tiger hit a golf ball with an initial velocity of 150 ft/sec at an angle of elevation of 30°. Write the parametric equations to represent the flight of the ball. How long is the golf ball in the air? Determine the distance the ball traveled.

32. physics

You push your backpack, mass 2.8 kg across the desk with a force of 49.3 N. Calculate the acceleration of the backpack. Neglect friction forces and give your answer to 3 significant figures.

33. science (check!)

4. Use of which of the following does not contribute carbon dioxide to the environment? refrigerator charcoal grill computer bicycle*** --------------- 5. Why does buying food that is grown in your local area help prevent loss of biodiversity? Local plants

34. algebra

Consider the following four polynomials, labeled A - D: A. ( 2x2 - 4x ) B. ( x3 - 1 ) C. ( -3x3 + x2 - 4x ) D. ( x5 + x2 - 3 ) Find an algebraic expression that uses each of the four polynomials once and simplifies to: x8 + 3 Your expression may involve

35. physics

An Angry Bird sits on a clothes line midway between the two poles. bird on line If the combined weight of the bird and rope is W, what is the tension in the rope in terms of θ and W? Select one: a. W cosθ / sinθ b. W tanθ c. W/(2sinθ) d. W/(2cosθ)

36. science

If a 0.5 L container of juice contains 15 g of sugar, what's the concentration of sugar? A. 30 g/L B. 3.33 g/L C. 45 g/L D. 7.5 g/L I think b

37. math

When x is divided by 3,the remainder is z.In terms of z, which of the following could be equal to x ? a. z-3 b. 3-z c. 3z d. 6+z e. 9+2z please answer and explain

38. physics

How much heat is added to 10.5 g of ice at -20.0°C to convert it to steam at 123.5°C?

39. Science 207

3. How would the “weather” be affected if the water was at a decreased temperature? What about at an increased temperature?

40. Introduction to oPsychology

When you drive down the street listening to your car's radio, you may not think about the fact that the music is received by the radio's antenna. Which part of the human neuron serves the same purpose as asn antenna-that is, receiving information?

41. Precal

Can someone please help me with the last 4 questions in this paragraph? Suppose that Tiger hit a golf ball with an initial velocity of 150 ft/sec at an angle of elevation of 30°. Write the parametric equations to represent the flight of the ball. How long

42. math

Oatmeal is packed in a cylindrical container The diameter of the container is 13cm and its height is 24 cm. Determine in terms of TT (pi), the volume of the cylinder, in cubic centimeters v=TTr^2h v=TT6.5^2(24) v=1014 TT(pi) Is this correct? Thanks for

43. Math

The path of a basketball foul shot is modelled by the relation h=-0.44d*2+4.4d+7, where h is the height in feet and d is the horizontal distance in feet. At what height is the ball released? What was the maximum height the ball reached? The centre of the

44. history

Which statement explains why Britain became a part of the Roman Empire much later than nearby Gaul? A. Mountains near the coast of Gaul were an obstacle. B. Rome was not interested in local resources from Britain. C. Fierce tribes in Britain held of Roman

asked by I NEED HELP FAST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
45. science

In the circuit above, the resistors all have the same resistance. The battery, wires, and ammeter have negligible resistance. A closed switch also has negligible resistance. Closing which of the switches will produce the greatest power dissipation in R2?

46. Chemistry

Dr bob for this question :Calculate the molar solubility of manganese II hydroxide in ph 12.85 solution. The Ksp is 2.1 x 10^-13 but I can't solve for x thanks.

47. Math

At a park, a landscaper wishes to plant a uniform border of tulips around the outside of a 18m by 12m rectangular garden. The garden will look best if the area of the tulip border is half the area of the garden. How wide should the border be?

48. Math

A 10m by 20m pool is to be surrounded by a deck of uniform width. The area of the deck is twice the area of the pool, what is the width of the deck?

49. math

54. The volume of certain rectangular solid is 12x. If the dimensions of the solid are the integers x,y,and z,what is the greratest possible value of z? a. 36 b. 24 c. 12 d. 6 e. 4 please answer and explain

50. Math

There are 30 seniors, 15 juniors, 12 freshman, and 10 sophomores in the club. When one student is picked randomly, what is the probability that a sophomore is not chosen? 57/67?

51. math

The slope of a bike is 1,9 and rises 4 feet. What is the horizontal distance covered by this jump?

52. Math

A model rocket is launched from a roof of a building. Its path is described by the relationship h=-5t*2+35t+10, where h is the height in metres and t is the time in seconds. How tall is the building? What is the maximum height that the rocket will reach?

53. physics

12 wires each of resistance 'r' ohm are connected to form a cube. Find the resistance if current enters through one edge and leaves through other corner of the same edge of the cube

54. math

rachel drove 260 miles using 12 gallons of gas. at this rate, how many gallons of gas would she need to drive 286 miles?

55. geography

Significant settlement in Manitoba, Saskatchewan, and Alberta A. occurred only after World War II. B. followed the completion of Canada's transcontinental railways. C. occurred only as major highways were built across Canada. D. was a response to the world

56. Precal

Suppose that you are sitting in a chair on a Ferris wheel that has a diameter of 120 feet that is boarded 6 feet above the ground at the 6 o’clock position. If the Ferris wheel moves in a counterclockwise direction and makes one revolution every 12

57. algebra 1

if y varies inversely with x' find the constant of variation and write an equation if y=1/2 and x=-10

58. math

solve the inequality -5(x-7)

59. economics

Are there. Any current subsidy or welfare issues that are being discussed or adressed in. Parliament or in municipality?

60. trigonometry

A sled travels from point A at the top of a hill to Point B at the bottom. If the distance from point A to point B is 120 m and the vertical change is 50 m, find the angle of depression to the nearest degree.

DNA is copied by an enzyme called DNA (A) __________, and the process of copying DNA is called (B) __________. The two new double-stranded DNA molecules have one strand from the original DNA molecule and one strand from the freshly assembled strand of

62. Chemistry

Calculate the molar solubility of manganese II hydroxide in ph 12.85 solution.

63. chem 11

Calculate the molar concentration of a solution made by dissolving 20.0g of sodium hydroxide to make 300ml of solution.

64. trigonometry

A tent pole is 85 feet high. A cable is attached to the ground 200 feet from the tower base. How long is the cable? What is the measure of the angle the cable makes to the ground?

65. algebra

the gateway arch is the tallest man-made monument found in the united states in St. Louis missouri. The gateway arch can be closely approximated by a parabola, is 630 feet high and 630 feet across at the base. 1) the maintenance crew is doing ht side of

66. Algebra

What is the probability of getting a license plate that has a repeated letter or digit if you live in a state in which license plates have one numeral followed by three letters followed by three numerals? (Round your answer to one decimal place.)

asked by Mary Ann
67. Chemistry

What element(s) are more polarizable than oxygen? How can you tell? Wouldn't fluorine be most polarizable, because it is the most electronegative?

68. Physics

A sled of mass 9.0 kg is sliding across a frozen lake with a speed of 5.0 m/s. A package of mass 4.0 kg is dropped onto it from above. Assuming there is no friction between the sled and the lake, what is the new speed of the sled?

69. Math

Mrs. Sue please help me! 7. A bag contains 7 green marbles, 9 red marbles, 10 orange marbles, 5 brown marbles, and 10 blue marbles. You choose a marble, replace it, and choose again. What is P(red, then blue)? (1 point) seventy-seven over one hundred

70. algebra

A single card is drawn from a standard deck of cards. Find the probability if the given information is known about the chosen card. A face card is a jack, queen, or king. P(face card|queen) Thank you

asked by Mary Ann
71. english- Intro edit

can someone edit this The mere pigment of one’s skin deep makeup has served as the basis for hurtful bias, racism, and other discriminating actions within our society. The racially perceptive film, Do the Right Thing by Spike Lee, exemplifies how

72. Physics

A golf ball is struck by a golf club at 55 m/s at an angle of 28.0o above the horizontal. The mass of the ball is 45 grams and is in contact with the golf club for 1.5 m/s. Calculate the average force exerted on the ball by the club.

73. algebra

A single card is drawn from a standard deck of cards. Find the probability if the given information is known about the chosen card. A face card is a jack, queen, or king.

Posted by bibi on Sunday, May 25, 2014 at 6:42pm. I need help can someone Help please. Thank everyone. I really appreciated. Break-even Analysis. the R from selling x units of a product is R=139.95x the Cost C of producing units is C=97X+850. In order to

75. Algebra/Probability

Suppose that you toss a coin and roll a die. What is the probability of obtaining tails or a six? (Enter the probability as a fraction.) I came up with 1/6 which does not sound right thank you for you time on this Holiday

asked by Mary Ann
76. Economics

What are welfare payments or consumers subsidies?

77. Physics

Two particles with the same mass and same initial speed collide and stick together and leave the collision with half of their initial speed, bound together as one particle. What was the angle between the initial momenta of the particles before the

78. Math

The altitude of a triangle is 2cm longer than its base. The area of the triangle is 60 cm*2. What are the dimensions of the triangle?

79. Algebra 1--Please, help me!

1. The number of calculators Mrs. Hopkins can buy for the classroom varies inversely as the cost of each calculator. She can buy 24 calculators that cost \$60 each. How many calculators can she buy if they cost \$80 each? A: ? 2. Jeffs builds model train

80. Math

If a vehicle travels 1320 feet in seven seconds from a dead stop , how long does it take for that same vehicle to travel 1313 feet from a dead stop ?

81. sinolwazi

The south african government is not providing enough welfare or subsidies to the poor and under priviledged?

82. algebra/Did I do this right

A single card is drawn from a standard deck of cards. Find the probability if the given information is known about the chosen card. A face card is a jack, queen, or king. P(face card|king) I came up with 12/52 Thank you

asked by Mary Ann
83. chemistry

How much naoh and hno3 is needed to make nano3?

84. physics

A student of mass 64.7 kg climbs up the stairs in the Physics Department, with a vertical height change 3.1 metres. What is the change in gravitational potential energy? Give your answer in Joules, to 2 significant figures.

85. Algebra, Need help with last part.Thank you

A single card is selected from an ordinary deck of cards. The sample space is shown in the figure below. Find the probabilities. (Enter the probabilities as fractions.) P (two of hearts0 I got 1/52 correct P ( two)I got 4/52 correct P (heart)I am not sure.

asked by Mary Ann
86. Calculus

How do you solve the equation log(x+6)-log(2x+1)=log4

87. Algebra

Find the coordinates of the image after a reflection in the given line. [-8, 1, -7] [-7, -5, 1]; y axis I am really bad with these types (matrices) of questions, please help me.

88. geography

among the northern andean countries strongly involved in the illegal coca and drug trade_______ is now the predominant cocoa producer. A. Bolivia B. Peru C. Ecuador D. Columbia

89. Physics

Please help me! 1)1. Two charged point bodies are placed into the opposite on diagonal vertices of a rectangular with sides of 6 and 8 cm in vacuum – Q1=3.2x10-11 C; Q2=-4.267x10-11 C. Calculate the electric field intensity at two other vertices of the

90. Precal

A distress flare is shot straight up from a ship’s bridge 75 ft above the water with an initial velocity of 76 ft/sec. a) Write a set of parametric equations for the path of the flare. ______________________________ ______________________________ What

91. college physics

What work is done by a friction force acting on an object? Select one: a. Always negative b. Always positive c. May be positive or negative depending on the choice of coordinate system d. Always zero

92. Math

The probability of rolling a number less than 4 on a number cube is ____ 1/2?

93. algebra

Complete the table of solutions 7x-2y =-21 X Y (X,Y) 3 ---- (---- , ----) --- 0 (---,---)

94. Algebra

In this activity, you will design and conduct a survey. Select a topic for your survey. d. Are the people you surveyed representative of the group you want to study? What does D mean?

95. physics

What work is done by a friction force acting on an object? Select one: a. Always negative b. Always positive c. May be positive or negative depending on the choice of coordinate system d. Always zero

96. physical education

what is a small definition of log roll answer:clutched on the ground with both ands at your side and roll

97. Math, grade 10

Two whole numbers add to 17 and the sum of their squares is 185. What are the numbers

98. Physics

an electron is sitting 10cm away from a small object -5nc it is let go and moves away from the charged object when it reaches a distance of 15 cm away find its speed

99. Physics

A 50kg mass and a 85kg mass are hung over a frictionless pulley what is the acceleration of the system

100. geography

In Brazil, the indigenous population was around 3.5 million before the arrival of Europeans. Today, the indigenous population is around A. 500,000 B. 200,000 C. 1.5 million D. 2 million

101. college physics

A student of mass 64.7 kg climbs up the stairs in the Physics Department, with a vertical height change 3.1 metres. What is the change in gravitational potential energy? Give your answer in Joules, to 2 significant figures.

102. physics

A force 457 Newtons causes a displacement 6.2 metres which is at an angle of 8o to the direction of the force vector. Calculate the work done by the force.

103. intermed Algebra

I need help solving this , If the formula R= -0.037t + 50.1 can be used to predict the world record in the 400 meter dash t years after 1925, for what years will the world records be 48.8 seconds or less. I am clueless what to do been on this for an hour.

104. math

How much money I saved if I follow this number pattern 5,10,15,?20?30

105. economics

what are welfare payments and subsidies?

106. science

what valency ?how can we find valency?explain.

107. math

what is the rule if input is 23 and output is 56

asked by Bhekifa Maseko
108. data structure

Consider the algebraic expression (2x y)(a-7b)^3

109. algebra

Expand. 2(x+10) It looks easy but what do they mean by expand?

110. Algebra 1--Please, help me!

1. Jeffs builds model train layouts. He has \$75 to spend on packages of miniature landscape items. He receives 6 free packages with each order. The number of packages y that Jeff can buy is given by y = 75/x + 6, where x represents the cost of each package

111. algebra

Suppose that state’s record high temperature of 102 was set in 1930, and the record low of -14 was set in 1966. What is the range of these temperature extremes?

112. Chemistry HELP

you have 12.56 g of a mixture made up of sodium chloride and barium chloride. explain how you could use a precipitation reaction to determine how much of each compound the mixture contains

113. English

1. Try Yummy stick food from Wangfujing Street. 2. Try Yummy stick foods from Wangfujing Street. ------------------ Which one is grammatical? Are both grammatical? Then what is the difference between them?

114. English

1. Wangfujing Street in Beijing Street is crowded day and night. 2. Wangfujing Street in Beijing Street is crowded night and day. ----------------------- Are both grammatical? Is only #1 right?

115. physics

An electron of charge -e and a long straight wire carrying a current I to the right are both in the plane of the page, as shown above. In the position shown, the electron is a distance R from the wire and is moving directly toward it with speed v. What is

116. physics

A force 457 Newtons causes a displacement 6.2 metres which is at an angle of 8 degrees to the direction of the force vector. Calculate the work done by the force.

117. math

2 1/10* 2 1/7=

118. college

the fair labor standards act

119. BIO

Which gamete, the egg or sperm, determines if Holly and Edward will have a boy or girl? (A)__________ If in the future Holly and Edward have three boys, what is the probability that their fourth child will be a girl? (B)__________ MY FIRST ANSWER IS SPERM

120. sci207

How would the "weather" be affected if the water was at a decreased temperature?

121. maths

(√7+√5)(√7-√5)

122. Chemistry

What is the hybrid ization? SP 1,2,3 What is #sigma and #pi? Thank you so much for your help!! 😄

asked by NeEd HeLp
123. math

if i an 100' from a tree and the angle to the top is 24 degrees how tall is the tree

124. Civics

True or False: The governor has similar powers to the president?

125. Math, grade 10

Two numbers add to 18. If you square the larger number and add 6 times the smaller number you get 163. What are the numbers. Solve with quadratic equation?

126. composition

an animal i wanted for pet

127. world history

Does anyone know any songs that relate to the period of time from 600 CE to 1450 CE?

128. Bus 308

The goodness of fit test requires the expected distribution to be equally distributed across the categories. (Points : 1) true or false

129. math

If a number increases from 2,000 to 2,610 what is the rate of increase?

130. geography

Which of the following were the main proponents of NAFTA? A. Labor unions B. Human rights groups C. Environmentalists D. Large corporations

131. college

all of the following are assets excep

132. math

Given: R=(1,2,3,4,) A=(0,2,4,6) P=(1,3,5,7) What is R U P U= the symbol actually is an upside down U. We didn't learn this symbol so I do not know what to do. Can you help? answer choices are: 1) (0,1,2,3,4,5,6,7) 2) (1,2,3,4,5,7) 3) (1,3) 4) (2,4) Thank

133. maths

An aircraft dropped a box of emergency supplies to a group of trampers. The height of the box above the ground, h, at time, t is given by the formula; h = 520 - 5t^2, where h is in metres and t is in seconds. Find how long it takes for the box to fall to

134. Chemistry

Describe in detail how light is produced. (Hint: energy levels) Thank you so much for your help!! 😊

asked by NeEd HeLp
135. Math

These two box and whisker plots show the results of a science test. Plot 1: Minimum:65, Maximum:95, Median:82, 1st Quartile:67, 3rd Quartile:88 Plot 2: Minimum:57, Maximum:100, Median:92, 1st Quartile:78, 3rd Quartile:93 What does this information tell you