1. physics

two ends of a train moving with constant acceleration pass a certain point with velocities u and v. what is the velocity with which the middle point of the train passes the same point? I have asked this question before you have answered u+v/2. but my mam

2. geometry

in an equilateral triangle RST, R has coordinates (0.0)and T has coordinate of (2a,0).Find the coordinates of S in terms of a.

3. math

enrollment in a business seminar increased from 52 people to 71 people. what was the percent increase.

4. chemistry

Which of the following pairs of molecules have the same oxidation number for carbon? CO and CO2 CH4 and CCl4 C6H12O6 and C(s) H2CO and COCl2 Carbon always has an oxidation number of +4 What mass of CuSO4.5H2O would you need to prepare 250.0 mL of a 0.250 M

5. Algebra II

If an object is propelled upward from a height of 16 ft at an initial velocity of 80 feet per sec, the its height after t seconds is given by the equation h=-16t²+80t+16, where h is in feet. after how many seconds will the object reach a height of 116 ft?

6. Chem

What is the speed of an argon atom that has a de Broglie wavelength of 5.2 pm?

7. math

find the perimeter and area of a right triangle if the shortest side is 20 mm. and the longest side is 52 mm. include correct units with each part in solution.

8. physics

a box slides down a smooth inclined plane 30m long and 10m high.determine the speed of the box at the bottom of the plane if it starts from rest at the top.

9. physics

a car moving on a straight road with a speed of 20m/s. at t=0 the driver of the car applies the breaks after watching an obstacle 150m ahead. after application of breaks, the car retards with 2m/s^2. find the position of the car from the obstacle at t=15s.

10. Algebra II

A projectile is thrown upward so that its distance above the ground after t sec is given by h(t)=-11t²+264t. After how many seconds does it reach its maximum height?

11. Algebra II

Suppose that y varies directly as the 3/2 power of x, and that y=192 when x= 16. find y when x=9.

12. Physics

As your bus rounds a flat curve at constant speed, a package with mass 0.300 , suspended from the luggage compartment of the bus by a string 46.0 long, is found to hang at rest relative to the bus, with the string making an angle of 30.0 with the vertical.

13. algebra

5. 16t2 gives the distance in feet a free-falling object falls in t seconds. 16t2 + 10t gives the distance an object falls in t seconds when it is thrown down with an initial velocity of 10 feet per second. Use this polynomials to: a. Find how far a wallet

14. geometry

In parallelogram ABCD, A (0,0),B(a,b)and D(c,0)are three of it's vertices, what are the coordinates of C in terms of a,b,c

15. Chem

What is the wavelenght of a radio station operating at a frequency of 99.6 MHz?

16. chemistry

I am having trouble balancing one of the half reactions: AsO3^(-3) --> AsO4^(-4) Which side should OH and H2O go? Thanks.

17. math

family phone bill decreased from \$50 a month to about \$46 a month. what was the percent decrease?

18. finance

swh corporation issued bonds on january 1, 2004. The bonds had a coupon rate of 4.5%, with interest paid semiannually. The face of the bonds is \$1000 and the bonds mature on January 1, 2014. What is the instrinsic value (to the nearest dollar) of an swh

19. exp of math

sales of frozen pizza for a club fundraiser increased from 500 one year to 520 the next year. what is the percent increase

20. early childhood education

Catherine goes to her local movie theater only to see romantic comedies. Since Catherine did not go to the movies yesterday, there is not a romantic comedy playing at her local theater. The reasoning above is flawed because the evidence

21. chemistry

Predict whether reactions should occur between aqueous solutions of the following compounds. If so, write balanced molecular and net ionic equations for the reactions. Include physical states. a. (NH4)2CO3 and CrCl3 b. Ba(OH)2 and HCl c. FeCl3 and NaOH d.

22. math

All 32 of students attended class on monday on tuesday 20 % attended. what is the percentage decrease?

23. math

find the perimeter and area of a right triangle if 1 leg measures 10 ft. and the other leg measures 24ft. show all work please.

24. physics

An elevator starts from rest with a constant upward acceleration and moves 1m in the first 1.4 s. A passenger in the elevator is holding a 6.3 kg bundle at the end of a vertical chord. what is the tension in the chord as the elevator accelerates? The

25. chemistry

Suggest chemical reactions that could be used to identify the contents of four unlabeled bottles containing solutions of the following substances: CuSO4, Al2(SO4)3, Pb(NO3)2, and FeSO4.

26. physics

Two masses are involved in an elastic collision. The first has a mass of 0.150 kg and an initial velocity of 0.900 m/s directed at an angle of 50 degrees with the positive y-axis as shown below. The second mass, of 0.260 kg moves along the x-axis with an

27. writing

Have you ever wondered what the world would be like in the future? According to events taking place now in the world, our future will change drastically. In 50 years, our society, environment, and schools will be greatly affected. Our society will change

28. math

how much money should you invest now to have 6000 in 11 years if you invest the money at a rate of 11.1%. compounded semiannually.

Your brother just won the Power Ball lottery. He has the choice of \$10,000,000 today or 30-year annuity of \$500,000, with the first payment coming today. What rate of return is built into the annuity?

30. physics

Two identical springs (neglect their masses) are used to “play catch” with a small block of mass 200 g (see the figure). Spring A is attached to the floor and compressed 10.0 cm with the mass on the end of it (loosely). Spring A is released from rest

31. chemistry

Consider the following equations. For each, decide whether it represents a chemical reaction or a physical change. a. SnCl4(aq) + 4H2O(l)  Sn(OH)4(s) + 4HCl(aq) b. 4K(s) + O2(g)  2K2O(s) c. NaCl(s)  Na+(aq) + Cl-(aq)

32. chemistry

Benzene, C6H6, is a known carcinogen that burns in air according to the following unbalanced equation: C6H6(l) + O2(g)  CO2(g) + H2O(g) a. What is the mole ratio of O2 to C6H6? b. How many moles of O2 are required to react with each mole of C6H6? c. How

33. physics

a point moving on a straight line traversed half the distance with a velocity v0. the remaining part of the distance was covered with velocity v1 for half the time, and with velocity v2 for the other half of the time. find the mean velocity of the point

34. Physics

Water is lifted out of a well 25.0 m deep by a motor rated at 1.50 hp. Assuming efficiency 90%, how many kilograms of water can be lifted in 1 min?

35. math

Suppose the 435 members of the House of Representatives are placed on committees consisting of more than2 members but fewer than 30 members. Each committee is to have an equal number of members and each member is to be on only one committee. a. What size

36. physics

Two identical springs (neglect their masses) are used to “play catch” with a small block of mass 200 g (see the figure). Spring A is attached to the floor and compressed 10.0 cm with the mass on the end of it (loosely). Spring A is released from rest

37. math

in a 9 in. sq. cake pan and 1 10 in. sq. cake pan, what is the difference in volume each pan will hold? assume each pan is 3 in. high. show step by step work and correct units with solution.

38. Math

An inlet pipe on a swimming pool can be used to fill the pool in 24 hours. The drain pipe can be used to empty the pool in 40 hours. If the pool is one-third filled and then the drain pipe is accidentally opened, how long will it take to fill the pool?

39. world history

How is the historical event of the 1981 Springbok Tour is, or was, of significance to New Zealanders.

40. microeconomics

Sam Johnson started a small machine shop, Machines, Inc., in his garage and incorporated it in March of 2002 as a calendar-year corporation. At that time, he began using his personal computer and tools solely for the business as part of his contribution to

41. physics

A non stop bus goes from one station to another at a speed of 54 km/h. The bus returns from the second station to first station at a speed of 36 km/h. Find the average speed of the bus.

42. math

how many cubic inches of ice cream can an ice cream cone hold (within the cone) if its height is 7 inches and the diameter of its base is 3 inches? give solution accurate to the nearest hundredth.

43. Algebra

An inlet pipe on a swimming pool can be used to fill the pool in 24 hours. The drain pipe can be used to empty the pool in 40 hours. If the pool is one-third filled and then the drain pipe is accidentally opened, how long will it take to fill the pool?

44. science

The concentration of commercially available concentrated nitric acid is 70% , or 15.9M In 100 grams of solution there are 1.11 mol of HNO3. Calculate the volume of 100 g of the Solution.

45. chemistry

iF 50.0 g of iron (II) carbonate react completely with hydrochloric acid, how many grams of carbon dioxide gas may be produced?

46. Algebra 2

Factor: 10ab^3 – 5a^3b^2

47. Algebra

Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this. 4x + 4y = -36 4x + 4y = 12

48. English

What will i study? Is this sentence right?I think that it is not correct,formal writing."What shall i study" is the correct question,but why say that "What will i study?".Is it right?

49. Emma Rae

2Mg + O2--->2MgO If more oxygen is added, the amount of magnesium a.will increase. b.will decrease c.will not change. and why? Thanks for your help

50. Physics

A vertical spring with a force constant of 250 N/m is compressed 7.5 cm and a 0.30 kg ball placed on top. The spring is released and the ball flies vertically upward. How high does the ball go? (thanks for helping)

51. math

exactly how many cubic inches of ice cream can an ice cream cone hold (within the cone) if its height is 6 inches and the radius of its base is 2.5 inches? include correct units with the solution. use "pi" in place of the pi symbol.

52. Grammar

Question: When two words act as a single modifier, or adjective, for a noun, this is called a/an ________. a. compound modifier b. coordinating conjunction c. adverb modifier d. prepositional phrase ANSWER: a. compound modifier

53. algebra II

What is the axis of symmetry of f(x)= -1/2^2-x+4?

54. Algebra

If you drive 253 miles on 11 1/2 gallons of gas, what is the simplified ratio of miles to gallons? ____ to 1?

55. Algebra

4x +7 =18, then what is the value of 12x +21? I don't know the value of x.

56. Physics

An aluminum cube that has an edge length of 7 cm. is placed in a beaker of water that is filled to the brim. As a result the water overflows. what volume of water overflows when the aluminum cube is submerged in the water?

57. algebra

5/2-3x=6/7-4x

58. statistics

what is the name of an article that can show the chi-square assumption?

59. algebra

5. 16t2 gives the distance in feet a free-falling object falls in t seconds. 16t2 + 10t gives the distance an object falls in t seconds when it is thrown down with an initial velocity of 10 feet per second. Use this polynomials to: Find how far a quarter

60. Chemistry

2Mg + O2--->2MgO If more magnesium is added a.the reaction will shift to the right. b.the reaction will shift to the left. c.there will be no shift. and why im confused on why it would happen.

61. Chemistry

Select the most likely rate law for the following: (CH3)3C-Br + OH- > (CH3)3C-OH + Br- a. Rate=k[(CH3)3C-Br] b. Rate=k[(CH3)3C-Br][OH-] c. Rate=k[(CH3)3C-Br][OH-]2 d. Rate=k[(CH3)3C-Br]2[OH-]2 e. Rate=k[(CH3)3C-Br]2[OH-] The correct is answer is "a" but

62. Chemistry

If oxygen is removed, the amount of magnesium oxide a.will increase b.will decrease c.will not change. and why? Thanks for your help

63. Algebra 2

f(x)= x+5, if x>0 3, if x

64. Chem

A certain shell is known to have a total of 16 orbitals, which shell is it?

65. math

how much money should you invest now to have 7000 in 11 years if you invest the money at a rate of 9.3%. compounded semiannually

66. math

what is the amount of the investment 1300 at 4% compounded quarterly for 6 years

67. math

how much money should you invest now to have 5000 in 11 years if you invest the money at a rate of 9.4%. compounded semiannually

68. math

Find the area of a rectangle if its length measure 12 cm and its width measures 13 cm. Include correct units with the solution.

69. physics

A block of mass 35 kg moves on the horizontal surface. If initially at rest whwat is the speed of the block after moving a distance of 6m when G=32?

70. math

Each liter of air has a mass of 1.80 grams.How many liters of air are contained in 2.5 x10 to the third power kg of air?

71. stats

If other factors are held constant, how does increasing the sample variance affect the value of the independent-measures t statistic and the likelihood of rejecting the null hypothesis?

72. algebra II

Solve: x^4 - 2x^2 = 35

73. Algebra 2

The number of tickets sold each day for an upcoming performance of Handel's Messiah is given..........? by N(x)=-0.3x^2+8.4x+10, where x is the number of days since the concert was first announced. When will daily tickets sales peak and how many tickets

74. College Math

An inlet pipe on a swimming pool can be used to fill the pool in 24 hours. The drain pipe can be used to empty the pool in 40 hours. If the pool is one-third filled and then the drain pipe is accidentally opened, how long will it take to fill the pool?

75. Algebra 2

Simplify: 8rs^2/5s^4 times (2r^3)^-1

76. algebra II

Simplify: (3c^2)(-6cd)^-2

77. algebra

THE FUNCTION D(X) MODELS THE CUMULATIVE NUMBER OF DEATHS FROM A DISEASE X YEARS AFTER 1984. ESTIMATE THE YEAR WHEN THERE WERE 90,000 DEATHS D(x)=2010X^2+5400X+5774

78. mathematics

2a^2-3a-2/4a^2-1 (4a^2-1 = denominator) divided by a^2-4/2a^2-5a+2

79. History

Hello Any help would be greatful...TIA 1..What is the Agrarian Myth According from Hofstater? 2. When did the Myth 1st appear and whom was responsible for it? 3.Was there ever a time in America History when conditions corresponded to the myth? Thanks

80. mechanical

n projectile motion if range is the maximum, then what will be the height?.

81. math

what isthe area of a 8 inch circle?? what are the calculations. ???

82. exp of math

if john has a balance of 2195. after 3 years what will be the amount of the interest at 8%. compounded semiannually

The first offense for federal trafficking penalties that is not less than 10 years and not more than life applies to wich drugs: a) cocaine b) Heroin c)Methamphetamine d)LSD e)none of the above My answer is E.

84. math

Kahlil said that using the equation (a + b)2 = a2 + 2ab + b2, he can find a similar equation for (a - b)2. Examine his argument. (a - b)2 = [a + (-b)]2 = a2 + 2a(-b) + (-b)2 = a2 – 2ab + b2

85. physics

I have a question based off of the response to the question I posted below. Sorry, i wanted to make sure that i clearly understood,so My question about the third solution is: Is the horizontal force zero N? or is it 721.3N? A dragster and driver together

86. alga br e

How many ft of fencing is needed to enclose a square with 33ft sides

87. math

Each liter of air has a mass of 1.80 grams.How many liters of air are contained in 2.5 x10 to the third power kg of air?

88. math

Each liter of air has a mass of 1.80 grams.How many liters of air are contained in 2.5 x10 to the third power kg of air?

89. algebra II

The _______ of a quadratic equation can be used to find the number of solutions it has. ?? A. vertex B. Axis of Symmetry C. Discriminant D. Leading Coefficent

90. algebra II

Solve using the quadratic formula: x^2 - 3x - 5 = 0

92. Math

Solve 2x^2+7x> 15

94. algebra II

What is the vertex of y > x^2 - 2x - 3?

95. finance

Entrepreneur Edward is planning to open a business selling ice cream. He knows that the price of ice cream is determined by the forces of supply and demand, but he wants a report outlining five specific events that can be expected to cause the equilibrium

96. Algebra II

Find the inverse of the function: f(x)=-x²+16, x≥0 f(x)=5/x-3

97. Algebra

use factoring to solve the equation 4x²-23x=6 I think the answer is x=-1/4,x=6 Just want to make sure that's right

f(x)=1/(x+2)

99. Math

Hello, For math I have to make a graph of two linear relations. One has to be the operating costs of a zoo or amusement park and the other cost of admission for me and my family. Using both linear relations I then have to find another relation that would

100. algebra 2

revenue from ticket sales: 4x(x+6) cost of band: 5x(x-4) profit: 160 (given in thousands, use 160) 1.the equation to determine profit id revenue-cost=profit. write the equation that explains the profit made last year. be certaiin to combine like terms. if

101. Algebra

The problem is 9x+4y=-12 x=26-5y Solve by substitution method

102. chemistry

What is [H+] concentration in a 4M aq solution of acetic acid (Ka= 1.8 E-5)? what formula do you use to get the answer?

103. ARYA

IF (TANA+TANB)=M AND (TANA-TANB)=N, THEN COT(A-B)=?

104. social studies

traits of dr. jose rizal

105. math

if 2 cars one a high speed race car, one a mid size sedan, are on the same road, both going 60 miles per hour, would they arrive at a given point at the same time or does the engine make a difference?

106. computer science

Step 3: Part C iLab Part C: Payroll Program Step 1: Create a New Project Create a new project and name it LAB1C. Make sure you close your previous program by clicking File >> Close Solution. This time, do not delete the code that gets automatically

107. math

write as percent 5/3

108. math

what would be a due date of a loan june 17 for 150 days the year is a leap year. is it june 17 or 18?

109. speech

I am writing a commemortative speech. And I want to commemorate my two year old nephew. He has many great qualities i just don't know how to word the things he does into simple words. For example when I walk in the door he is so happy to see me or when I

110. psychology

Often called the "father of modern psychology," Wilhelm Wundt painstakingly examined the small pieces of behavior. He was not interested in personalilty mental disorders. He did study the cognitive elements of: a)thinking, perception, and consciousness

111. Sci

A 5kg voulume of water falls from a shelf 2 meters above the floor, If all the energy is converted to heat, what is the change in temperature?

112. Chemistry

Choose the bond that is the weakest: A) Na-Cl B) I-I C) C=N D) Li-F E) C=O I don't understand the question... do they mean polarity wise, IMF wise or bond length wise. I know the answer is C but why C.

113. math

what is the exact circumference of a circle with a diameter of 13 inches?

114. Physics

If 60 Cal. are added to 6 g. of iron at 20 degrees Celsius what is the final temp.

115. lottory maths

winning no. marchine no. 85-42-43-36-50 5-74-35-24-23 83-58-43-21- 6 56-33-38-46-73 69-18-59-49-35 36- 9-47-71-78 14-40-88-76- 1 5-32-62-20-27 48-39-37-71-53 81-52-12- 6-14 29-63-80-57-37 19-65-42-44-21 69- 2-68-35-31 74-28-40- 1-83 47-74-20-42-11 49-22-

116. math

Each liter of air has a mass of 1.80 grams.How many liters of air are contained in 2.5 x10 to the third power kg of air?

117. math

Each liter of air has a mass of 1.80 grams.How many liters of air are contained in 2.5 x10 to the third power kg of air?

118. algebra II

The length of a rectangle is three more than twice its width. The area is 65 m2. What is its width?

f(x)=1/x+2

120. Algebra 2

write a quadratic equation in the variable x having the given numbers as solution. Type the equation in standard form, ax^2+bx+c=0 solution 4, only solution

121. algebra II

Solve: (3x + 5)^2 = -6

122. algebra II

The side of a square is (x – 4). What is the area in terms of x?

123. statistics

give an example of an article that shows the chi-square assumption method of ststistics

124. medical billing and coding

what is the relationship between the claim form and reimbursement

125. algebra II

Simplify: a^4-b^4/a-b

126. Math

Simplify (x-2)^2/2x+4 times (x^2+4x+4)

Read “Hi-Ho Yo-Yo, Inc.” on pages 771-772 in your text. Explain your analysis in a 2-4 page APA style paper using the rule definitions on page 746.

128. Writing

Any suggestions for writing topics?

129. grammar

Is the following an interrogative of declaritive sentence Guess who we saw today

130. physics

what are the basic measurements?

131. science

why archaeologist and environmental scientists were worried about the effect of an oil refinery which was close to Taj Mahal at Agra?

132. Math

Simplify:Assume that no denominator is 0and that 0^0 is not considered. question: (a^3b)(ab)^4

133. Math

Simplify:Remember to use absolute value notation when necessary. If a root cannot be simplified, state this. Ques: 5sq.rt-1/32

134. English

I'm looking for a nice four-star hotel near or in Yellow Stone Park for a family consisting of four people, two adults and two chilren of eleven and thirteen years old respectively. I hope someone from jiskha can help me because I've never been there. Do

135. Math

Simplify:Do not use use negative exponents in the answer. Ques: x-4*x-7

136. English

Help them carry their walker up the steps onto the bus. (What is the part of speech of 'onto the bus'? Is it an adjective phrase or an adverbial phrase? Can we use 'on' instead of 'onto'? Thank you for your help.)

137. math

what is the percent increase from 72 people to 92 people

138. math

Find the area of a square if 1 side measures 22 cm. Include correct units with solution.

139. math

how many cubic cm can a cigar box hold if its diameter is 4 cm by 10.5 cm by 7 cm?

140. history

The Cherokees were happy and prosperous under.... the government of the united states, and from the helping hand extended over them, they made rapid advances in civilization, morals and in the arts and sciences. Little did they anticipate, that when taught

141. algebra II

How many solutions does the equation x^2 - 2x - 2 = 0 have?

142. human services

where could i found information on the relationship between ethics, law, and professional practice?

143. algebra II

Solve by completing the square: a^2 - 4a = -8

144. Math

Solve: x^2-x-12> 0

145. algebra II

Simplify (-3i)^2

146. Math

Simplify: (4 - 5i)(3 + 2i)

147. algebra II

The length of a rectangle is three more than twice its width. The area is 65 m^2. What is its width?

148. math

how many cubic cm can a cigar box hold if its dimensions are 4 cm. by 14 cm. by 12 cm? include correct units with solution.

149. english

describe the surface of a planet using the 5 senses (year 7)....

151. Algebra II

Find x-intercepts y= x²-2 is it (-√2,0) (√2,0)?

152. MATHA

HOW TO WRITE 2ND JULY 2011 IN 5 LETTERS WITHOUT USING NUMBERS