# Questions Asked onNovember 24, 2012

1. ## Math

Use the rated acute angle to state an equivalent expression Tan110 The answer is tan290. Why isn't it 70? Please explain

2. ## math

Chances are 50-50 that a newborn baby will be a girl. For families with five children, what is the probability that all the children are girls

3. ## MATHS

A cylindrical water tank of diameter 1.4m and height 2.1m is being feed by a pipe of diameter 3.5cm through which water follows at the rate of 2m/per second . In how much time the tank will be filled ???

4. ## physics

a projectile shot at an angle of 60 degrees above the horizontal strikes a building 80 ft away at a point 48 ft above the point of projection (a) find the velocity of projection. (b) find the magnitude and direction of the velocity of the projectile when

5. ## math

A charity organization is collecting change to raise monay. They have collected twice as many dimes as quarters, 22 more nickels than dimes, and 3 times as many pennies as nickels. a) define a variable for the number of quarters collected. b) use you

6. ## Statistics

Scores on the SAT verbal test in recent years follow approximately N(504,111) distribution. What is the proportion of students scoring between 450 and 550? How high must a student score to place in the top 10% of all students taking the SAT? Please show

Solve the following system of equations using substitution. What is the value of y? 2x + 3y = 105 x + 2y = 65 A.15 B.25 C.40 D.65 I think it is B??

8. ## math

anna bought 3 types of fruit for a fruit salad. She paid three times as much for buleberries as for pears and \$2.50 less for strawberries than for blueberries. A) define a variable and write algebraic expressions to represent the amount she spent on each

9. ## physics

A stunt driver wants to make his car jump over eight cars parked side by side below a horizontal ramp a)With what minimum speed must he drive off the horizontal ramp? The vertical height of the ramp is 1.5m above the cars, and the horizontal distance he

10. ## Physics HELP!!

A snapshot graph of a travelling wave is shown. The wave is travelling to the right at 18.2m/s. What is the amplitude if the maximum displacement is 19.9cm and the total distance travelled by the wave is 41.2m? b). What is the wavelength of the wave?

11. ## Physics

A monatomic ideal gas expands from 1.00m^3 to 2.50m^3 st a constant pressure of 2.00x10^5 Pa. Find the change in the internal energy of the gas.

12. ## inermediate algebra

A box with no top is to be made by cutting a 2-inch square from each corner of a square sheet of metal. After bending up the sides, the volume of the box is to be 220 cubic inches. Find The the length of a side of the square sheet of the metal that should

13. ## Pre-Calc

A pilot of an airplane flying at 12,000 feet sights a water tower. The angle of depression to the base of the tower is 25°. What is the length of the line of sight from the plane to the tower?

14. ## chemistry

If isomers of an alkane have the same molecular formula, how do they differ?

15. ## Statistical Math-

In a sample of 200 people, 154 said they watched educational television. Find the 90% confidence interval of the true proportion of people who watch educational television. If the television company wanted to publicize the proportion of viewers, do you

16. ## Math

3) From two tracking stations A and B, 350 km apart, a UFO is sighted at C above AB making angle CAB = 32 degrees and angle CBA = 54 degrees. Find the height of the UFO. The answer is 150 km, please explain to me how 4) from a boat on the water, the angle

17. ## chemistry

Balance this chemical equation. Cr2O7 2-(aq) + Cu(s)---> Cr3+(aq) +Cu2+aq) I don't understand how to do this problem. Where do i begin? thank you.

A. random sample of 50 four year olds attending daycare centers provided a yearly tuition average of 3987\$ and the population standard deviation of \$630. Find the 90% confidence interval of the true mean. and B. If a daycare center were starting up and

19. ## chemistry

At what temperature would you expect dinitrogen pentoxide to sublime? N2O5(s)-->N2O5(g) N2O5(s)= DELTA H -43.1 N2O5(s)= S (J*K1-*MOL1-)= 178.2 N2O5(g)= DELTA H 13.3 N2O5(g)= S (J*K1-*MOL1-)=355.7 where do i start here?

20. ## Physics

A seasoned mini golfer is trying to make par on a tricky hole #5. The golfer can complete the hole by hitting the ball from the flat section it lays on, up a 45° ramp launching the ball into the hole which is d = 1.60 m away from the end of the ramp. If

21. ## Adult Development and life Assessment

What do we call the variable that is manipulated by an experimenter when conducting in experiment. 1. Independent VARIABLE 2. Dependent variable 3. Beased variable 4. Extraneous variable My answer: Independent variable

22. ## science

what is the density of carbon tetrachloride vapor at 0.975 atm and 125 celsius

23. ## precalculus

Find the vertices, foci, and asymptotes of the hyperbola. 16x2 − 9y2 = 144

24. ## Algebra 2

Te arch of the Sydeny Harbor Bridge can be modeled by y= -0.00211x^2 + 1.06x where x is the distance (in meters) from the left pylons and y is the height (in meters) of the arch above the water. For what distances x is the arch above the road? (It has a

25. ## chem

the max # of grams of K that can be obtained from 100.grams of KHCO3?

The pilot of an airplane traveling 250km/h wants to drop supplies to flood victims isolated on a patch of land 190m below.

27. ## Statistical Math

a recent study indicated that 29% of the 100 women over age 55 in the study were widows. a. How large a sample must you take to be 90% confident that the estimate is within 0.05 of the true proportion of women over age 55 who are widows? b. If no estimate

28. ## UNIVERSITY PHYSICS 1

as she pick up her riders a bus driver traverses four successive displacements represented by the expression (-6.30 b)i-(4.00 b cos 40)i-(4.00 sin 40)j+(3.00 b cos 50)i-(3.00 b sin 50)j-(5.00 b)j here b represents one city block,a convenient unit of

29. ## Calculus

A water trough is 6 m long, and its cross-section has the shape of an isosceles trapezoid that is 20 cm wide at the bottom, 50 cm wide at the top and 40 cm high. If the trough is being filled with water at the rate of 0.2 cubic meters/min, how fast is the

30. ## statistics

The winning team's score in 11 high school basketball games were recorded. If the sample mean is 9.5 points and sample standard deviation is 0.25 points, what is the 98% confidence interval for the true population mean?

31. ## math

A cone has a radius of 6 inches and a height of 9 inches a) calculate the volume of the cone. use pi. as my answer for part a i got 339.92 cubic inches,,,,,,, Is my answer correct ?? I need help doing part b and c. b) calculate a possible radius and height

32. ## chemistry

50 ml of Argon is collected at 60.0 degree C and 820.0 torr how much this sample weigh in grams?

33. ## chemistry

Calculate the volume of gas you would expect to be evoleved if X mol of magnesium were reacted with an excess of HCl at standard conditions. Would the answer be X, 22.4X, or 22400X?

34. ## physics

The small mass m sliding without friction along a looped track is to remain on the track at all times, even at the very top of the loop of radius r. a) In terms of the given quantities, determine the minimum release height h b) If the actual release height

35. ## chemistry

How would you prepare a supersaturated solution of CuSo4 in 100ml of water

36. ## Physics

A rocket is launched at an angle of 56.0° above the horizontal with an initial speed of 103 m/s. It moves for 3.00 s along its initial line of motion with an acceleration of 31.0 m/s2. At this time its engines fail and the rocket proceeds to move as a

37. ## chemistry

3 Cl2 + 6 KOH go toKClO3 + 5 KCl + 3 H2O How many moles of potassium chlorate form when 2 moles of potassium hydroxide react completely?

38. ## Statistics

The Columbus Zoo conducts a study to determine whether a household’s income can be used to predict the amount of money the household will give to the zoo’s annual fund drive. Give explanatory and response variables of this study?

39. ## Physics HELP!!

The wave is travelling to the right at 18.2m/s. What is the amplitude if the maximum displacement is 19.9cm and the total distance travelled by the wave is 41.2m? b) What is the wavelength of the wave? c).What is the frequency of the wave?

40. ## chemisty

How many mL of a 0.5M Ca(OH)2 solution are needed to neutralize 38mL of a 2M HNO3 solution?

41. ## math help

A charity organization is collecting change to raise monay. They have collected twice as many dimes as quarters, 22 more nickels than dimes, and 3 times as many pennies as nickels b) use you defines variable to write algebraic expressions to represent the

42. ## physics

a 10 kg mass is attached to one end of a string with a lenght of 5m and whirled in a horizontal circle overheadd at a rate of 1 revolution per second what is tension in the sring

43. ## MATH HELP

A charity organization is collecting change to raise monay. They have collected twice as many dimes as quarters, 22 more nickels than dimes, and 3 times as many pennies as nickels. a) define a variable for the number of quarters collected. b) use you

44. ## physics

a cyclist completes a lap around a circular track at a speed of 10m/s in 40s what is the displacement of the cyclist

45. ## math

Bernie invested a sum of money 8 yr ago in a savings account, which has since paid interest at the rate of 3%/year, compounded monthly. His investment is now worth \$39,396.92. How much did he originally invest? \$ ?

46. ## Physics

An FM radio station broadcasts at 82.3MHz. Determine the period of the radio waves. I already go the answer: 1.22×10-8 s but help me with part b please!!! b). What is the wavelength of the waves?

47. ## maths

a circular ink-blot grows at a rate of 2 sq cm per second. find the rate at which the radius is increasing after (28/11)seconds.

48. ## Chem.

I was trying to find the molecular formula for CuSO4 . XH2O. I ended up with the ratio of 1 mol CuSO4 : 3.85 mol H20 Would I have to round 3.85 to 4 or use a multiplier?

49. ## Math

Publishers records state: 20% of books published break even. 30% lose \$1000. 25% lose \$10,000. 25% earn 20,000. When a book is published, what is the expected income for the book?

50. ## math

a class consists of 24 boys and 16 girls.the average weight of the class is 41.7 kg,and the average weight of the boys is 41.1 kg.Find the average weight of the girls.

51. ## alebra

write the vertex form of a parabola that satisfies the conditions given. Then write the equation in the form y=a^+bx+c. vertex (-3,-4) and a=5.

52. ## Math

a spinner is spun whose central angles are all 45 degrees. #'s 1-8 on wheel. What is the probability that it lands on 5 if you know the following? a. it lands on an odd # b. it lands on a # greater than 3 c. it does not land on 7 or 8 d. it lands on a

53. ## Chemistry

How do you prepare 600.0mL of 0.48M Al(NO3)3*9H2O? Is this correct? 1. Measure out 71g of solution 2. Put approx. 300.0mL of water into container 3. Add the 71g of solution to the water and mix 4. Add more water until 600.0mL of solution is obtained 5. Mix

54. ## Math

How do we solve this problem? If possible change each comparison of red paint to white paint to a % comparison.If ot os not possible explain why? -the fraction of a mix that is red paint is 1/4. -the rario of red to white paint in a different mix is 2 to

55. ## chem

In a laboratory experiment 259 ml of gas was collectedd over water at 24 degree C and 752 torr. Calculate the volume, that the dry gas occupy at STP?

56. ## Math

A merchant makes two raisin nut mixtures. Each box of mixture A contains 9 ounces of peanuts and 2 ounces of raisins, and sells for \$2.80. Each box of mixture B contains 12 ounces of peanuts and 4 ounces of raisins, and sells for \$4.00. The company has

57. ## chemistry

how does aluminum's position on the periodic table relate to its properties? i mean like how does it effect it's properties? thank you

58. ## chemistry

what is the molarity of the acid in when a 30mL sample of HCl is titrated with 10mL of 6M NaOH?

59. ## chemistry

How does a complete structural formula differ from a condensed structural formula?

60. ## physics i really need help :(

A projectile is fired with an initial speed of 61.3m/s at an angle of 31.5° above the horizontal on a long flat firing range. a)Determine the maximum height reached by the projectile. b)Determine the total time in the air. c)Determine the total horizontal

61. ## Physics !>:(

A wave has angular frequency 46.2rad/s and wavelength 3.57m. What is its wave number? b).What is its wave speed?

62. ## Adult Development and life Assessment

Which of the following is not a secondary sex characteristic..... 1. !@#\$%^ 2. pubic hair 3. adams apple 4. facial hair My answer is facial hair. Is that correct

63. ## chemistry

@20*C solubility - 22g CuSO4 / 100g H2O @40*C solubility - 42g CuSO4 / 100g H2O which is saturated and unsaturated a. @20*C is 6g CuSO4 / 25g H2O b. @20*C is 30g CuSO4 / 150g H2O c. @40*C is 99g CuSO4 / 250g H2O please show work thanks

64. ## Calculus

A square piece of canvas measuring 10 ft. by 10 ft. is to be used to make a pup tent with open ends as shown. How long should the center pole be if the volume covered by the tent is to be maximum?

65. ## math

the entrance fee to the zoo is \$3,and to get into the gardens is \$2.A ticket to get into both is \$4. One day 900 people were at the zoo and 700 in the garden.If 500 people visited only the zoo,what was the total amount of money collected that day

66. ## math

The dance company has a \$10 cover charge, an average of 200 people will attend. For each \$0.25 increase in admission price, the average number attending decreases by 1. What should the owner charge in order to make the most money? what is the maximum money

67. ## statistics.. URGENT!! PLZ!!

The margin of error is: a. the difference between the point estimate and the true value of the population parameter b. the critical value times the standard error of the estimator c. the smallest possible sampling error d. none of the above Complete the

68. ## Math

Box contains 4 white balls and 8 black balls. Pick a ball with your left hand, and don't look, pick a ball with your right hand, and don't look at it either. a. what is the probability the ball in your left hand is white? b. Next, you look at the ball in

69. ## Statistics on Psychology

Hi there, I was looking for any assistance or help on how I would go about starting this assignment? Having difficulty understanding it. Thank you in advance. "A stats instructor is interested in investigating time of day his lectures were held on student'

70. ## chemistry

compleat and balance this equation. Na2CO3+Mg3(PO4)2

71. ## Accounting

Trying to get a little help on working this accounting problem. Please help... Jawed enterprises uses a job-order costing system and a predetermined overhead rate based on machine hours. At the beginning of the year, the company estimated manufacturing

72. ## crt 205

final project topic: American Patriotism is Alive and Well

73. ## Finite Math-Probability

Suppose we have an urn with 10 white balls and 6 red balls, and we create an experiment by randomly selecting 6 balls from the urn. a) What is the probability that the sample has the same number of white balls as red balls? b) What is the probability that

74. ## social studies

What are some ways to support diversity as it relates to health during midlife. Yes, this question directed to everybody. Yes, it is about everyone's health in midlife?

75. ## Math

How does the related acute angle help to determine the trigonometric ratios of angles greater than 90 degrees? (in terms of the Cartesian plane) And why is the sin, cos, and tan of the principal angle equal to the sin, cos, and tan of the related acute

76. ## Statistics

A random sample of 80 students at a large school shows an average grade of 72 in Algebra with a standard deviation of 4. What is the standard error?

77. ## Chemistry

Determine the percent by mass of water in your sample of hydrated copper (II) sulfate. Mass of water = 0.95 g Mass of anhydrous copper sulfate = 2.19 g Mass of hydrate copper sulfate = 3.14 g

78. ## math

How wide a strip must be left for planting flowers around a square garden of 20m on each side so that at least one-half of the garden is for flowers?

A jet airplane has an intensity of 97.7W/ m^2 when heard at a distance of 30.0m. What is the maximum sound intensity heard by a person on the ground when the airplane is 10100m overhead?

80. ## Physics HELP!!

a). The displacement of a wave travelling in the positive x-direction is D(x,t)=(5.94cm)sin(1.18x-132.6t), where x is in meters and t is in seconds. What is the frequency? b). What is its wavelength? c).What is the speed of the wave?

81. ## Adult Development and life Assessment

After hearing about some possible causes of sneezing, a scientist decides that room fresheners are the most common cause. What is the term that describes the scientist thinking 1. Hypothesis 2. Scientific method 3. Cognitive dissonance 4. Social influence

82. ## chemistry

This is an assesment question and im really bad at these, i did the first two questions and now i am stuck. They ask you to design a series of experiments that can be used to confirm the structure and organization of the table of relative strengths of

83. ## math

A charity organization is collecting change to raise monay. They have collected twice as many dimes as quarters, 22 more nickels than dimes, and 3 times as many pennies as nickels. a) define a variable for the number of quarters collected. b) use you

84. ## chemisrty

how many liters of oxygen can be produced at stp from the decomp. of .25 liters of 3M H2O2 ACCORDING TO THE REACTION 2H2O-2 H2O+O2

85. ## spanish literature

Osvaldo Dragun in his story Historia del hombre que se convirtio un perro: what is the conflict that the protagonist feels strongly about?

86. ## Chemistry

Name the following crystallographic features below using proper crystallographic notation. Image One [2ˉ21] [1ˉ12ˉ] [1ˉ1(1/2)] [(1/2)(1/2ˉ)1ˉ] Image 2 (1ˉ02) (21ˉ0) (201) (1ˉ02ˉ) The wrong answer as far I known in Image One:[(1/2)(1/2ˉ)1ˉ]

87. ## math

Find the present value of \$53705.69 due in 5 yr at an interest rate of 8%/year compounded continuously. \$ ?

88. ## English

1. You should not take on the task because you have to spend a lot of time on it. 2. You should not take the task because you have to spend a lot of time on it. 3.You should not take over the task because you have to spend a lot of time on it. (Which one

90. ## Chemistry

crystal structure of cesium chloride (CsCl). 1)Identify the crystal system: Cubic Tetragonal Orthorhombic Rhombohedral Hexagonal Monoclinic Triclinic 2)Identify the Bravais lattice: Simple cubic Body Centered Cubic Face Centered Cubic Hexagonal 3)Identify

91. ## Math

A runner is 22 km east and 15 km south of his starting point. How far is he in a direct line from his starting point?

92. ## maths

differentiate x^2ex^2 W.R TO X

93. ## math

at rush hour,240 people pass through a turnstile at a railway station each 5 minutes.If there are 8 turnstiles, how many people would pass through them all in an hour

94. ## ratio and rate

hummingbird has a wing beat of 200 beats per second. a bout how many wing beats would it have in 3 minutes

95. ## Math

2 dice are thrown. a. find the odds in favor of the following events: 1. getting a sum of 7 2. getting a sum greater than 3 3. getting a sum that is an even number b. find the odds against each of the events in part a

For the following system of equations, what is the x-value of the solution? –x + 2y = 6 6y = x + 18 A.-18 B.0 C.-6 D.3 I think its B??

97. ## Statistics for Social Science

A random sample of 80 students at a largae school shows an average grade of 72 in Algebra with a standard deviation of 4. Find the standar error.

98. ## chemistry

one isotope of chromium (atomic number 24) has an atomic mass of 53 amu. how many neutrons are in this particular isotope of chromium? A. 24 B. 29 C. 53 D. 77 I say A

99. ## English

In the old days, people thought that their souls left their bodies when they sneezed. They were worried that their souls might not get back into their bodies safely. So they said "Bless you" to pray for the safe return of the soul. No one believes it

100. ## physics

ball 1 has a mass of 5kg and a ball 2 has a mass of 10kg they both are dropped off a 20m tower. the force of gravity on the first ball is F1 and the force of gravity on the second ball is F2 what is the ratio of F1 to F2

101. ## precalculus

Find the vertices, foci, and asymptotes of the hyperbola. x^2/7 - y^2 = 1

102. ## precalculus

Find the vertices, foci, and asymptotes of the hyperbola. y^2 /9 - x^2/16 =1

103. ## hum 101

What are some examples of a situation that the strateigies used in "The Art of War by Sun Tzu be applied to?

104. ## chemistry

We have not even covered this material. Samples of 131I take 10 hours to prepare to ship. It takes 2 weeks to get to its destination. How much 131I must be produced to ensure the patient receives 8 grams of NaI using the 131I isotope in the compound? Does

105. ## biostatistic

there are 200 subjects enrolled to receive either experimental medications or placebo. At the end of study following data is collected after 6 week. (sd)= standard deviation. BP= blood pressure. experimental meds placebo (n=100) (n=100) Mean BP 120.2(sd

It is the beginning of a new year and you just received the landlord’s building expense pass through reconciliation for the previous year. Assuming the math is correct, what are the two most important things to look for?

107. ## Sociology Ethnic Studies

What is the difference between "Findings and Analysis"? And do I need to quote a lot in the findings section?

108. ## Math

You come home after dark, and porch light is out. You cannot tell which key opens the door.. you randomly try the 5 keys on your ring, 2 keys open your door. Draw a tree diagram for the experiment & Find the probability of opening the door on the first or

109. ## Math

two dice a. find the odds in favor of the following events: 1 getting a sum of 7 2 getting a sum greater than 3 3 getting a sum that is an even number b. find the odds against each of the events in part a

110. ## college algebra--need help please!!

find the domain of the composite function fog. f(x)= 2/x-3; g(x)= 7/x please show all work.

111. ## Pre-Calculus

Is the period of f(x) = 2cos(3x - ð) 2ð/3?

112. ## Graphing

must have a table with at least 5 values, a graph, a verbal description including whether it is increasing or decreasing as it is read left to right or visa versa for the following problem:Y=3^x

113. ## literature

The Electronic Reserve Reading for this week, “Bare Bones Guide to Good Introductions,” states that an effective introduction must “make use of psychology” (p 20). · What do you think the author meant

114. ## math

the average mark of 10 tests is 76%.If the average mark of the first 7 tests was 73%,what is the average mark of the remaining 3 test

115. ## pre cal

How lnog will it take for an investment of \$1000 to double in value if it earns 5% coumpounded weekly?

116. ## math

in the number 288, explain how the value represented by the digit in the tens place is related to the value represented by the digit in the ones place.

A microphone has an area of 3.0cm^2. It receives during a 6.00s time period a sound energy of 1.0x10-11J. What is the intensity of the sound? b). Using the intensity in the previous question, what is the variation of pressure in the sound wave if the speed

118. ## Adult Development and life Assessment

Speding time volunteering at the local food bank and agreeing to be part of the office group-walk for caharity are examle of 1. prosocial behavior 2. peer review 3. conformity 4. emotional intelligence Is it emotional intelligence

119. ## math

4C =2A + 2B , 2B = A + 3C How many C's will balance the combination of A and B

120. ## soal

What are some ways to support diversity as it relates to health during midlife.

121. ## algebra

Determine the comparable interest rate for a \$50,000 loan when the quoted information is 11.4% + 0.5 pt + \$300.

122. ## Project Management

Now that the company offsite 2-day training session project is over, conduct a postmortem review. Submit a 1- to 2-page memo that does the following: • Details the benefits and drawbacks of a postmortem review • Lists who should partake in this

123. ## Math

A runner is 22 km east and 15 km south of his starting point, how long would it take him to return to his starting point in a direct Line if he can run at 10 km per hour?

124. ## English

1. I think the baseball club is more popular than the ping-pong club. 2. I think baseball club is more popular than ping-pong club. 3. I think Baseball Club is more popular than Ping-pong Club. (Which expression is grammatical?)

125. ## algebra

x= radical x+13+7 is what approx. the solution to th nearest hundredth.

126. ## AP World History

What were some complexities of trade in Post Classical world and how it is similar and or different to today?

127. ## Physics HELP!!

The sound intensity of 1.2x10-12J/m2s is the threshold of hearing for humans. What is the amplitude of the motion of the air molecules if the speed of sound in the air is 343m/s and the density of air is 1.28kg/m^3? Take the frequency of the air molecules

128. ## college algebra--need help please!!

solve the following exponential equation. use exact answers only. not sure how to put it into the equation but it is 2 then 1-9x where the 1-9x is above the 2=e2x where the 2x is above the 2. Can someone tell me or explain to me how to put this equation

129. ## ant 101

Before colonialism, most colonized people lived in: (Points : 1)

How should I start of a one page written assignment on the marketing failure of a company? What should the first paragraph include?

131. ## 9th grade honors algebra

please help! I can't figure out the function rule for a table that says x=0,1,4,5 and y=9,6,-3,-6

133. ## math

how much would be in your savings acount in 8 years from an initial deposit of 150.00 today if the bank pays 7% 6% and (%

134. ## Math

Box contains 4 white balls and 8 black balls. Pick a ball with your left hand, and don't look, pick a ball with your right hand, and don't look at it either. a. what is the probability the ball in your left hand is white? b. Next, you look at the ball in

135. ## chemistry

Ca+NH3+Hcl will react to produce what?

136. ## Chemistry

Calculate the mass percent of a solution containing 10.5 of and 91.5 of H2O.

137. ## maths

The mapping is f:N →N, given by F(n)= 2n^3+1,n belongs to N. A. one-one and onto B. onto not one-one C. one-one not onto D. neither one-one nor onto

138. ## chemistry

solve the following and express your answer in scientific notation: (5.3 x 10^4) + (1.3 x 10^3) A. 5.4 X 10^4 B. 5.4 X 10^8 C. 6.6 X 10^7 D. 6.9 X 10^7 I say c

139. ## Algerbra

simplify a-1/a ___________ 2+3/2+1/a^2

140. ## math

A=B+2C , 3B = 2C +D ,A+2B = 2D How many B = D

141. ## Algerbra

Combine and show all work please 3/2y+2/y-1-2/y

142. ## Information Technology

I am pressed for time and need this assignment done by Sunday please. The language used is Java. I have attatched both worksheets to be used in this assignment. Thank you so much. Please reread the description of the Metric Conversion program in Worksheet

144. ## math

whats the present value of 850.00 made in 10 years with a discount rate of 12%

145. ## Chemistry

how do I determine the Ka for an acid HX if th epH of a 1.00M solution of HX is 4.5

146. ## maths

The mapping is f:N →N, given by F(n)= 2n^3=1,n belongs to N. A. one-one and onto B. onto not one-one C. one-one not onto D. neither one-one nor onto

147. ## physics

a box with a mass of 10 kg slides on a surface at 30m/s the coeffiecent of kinetic friction between the box and the surface is 0.5 what is the amount of frictional force