# Questions Asked onFebruary 19, 2017

1. ## Algebra2

suppose c and d vary inversely and d=2 when c=17 write an equation that models that variation find d when c=68

2. ## MATH

What is the percentage of sugar in the syrup made of 10 kg of water and 15 kg of sugar?

3. ## math

write a sequence of the transformation that maps quadrilateral ABCD onto quadrilateral A"B"C"D" in picture below.

4. ## Algebra2

write a recursive formula for the sequence 5,18,31,44,57 then find the next term. My answer is a1=5,an=an-1+13 The next term would be 70.

5. ## Ordinary Differential Equation

Form the differential equation of the family of straight line with slope and y- intercept equal

6. ## Math

At the movie theatre, child admission is \$5.50 and adult admission is \$9.50. On Saturday, 148 tickets were sold for a total sales of \$1170.00. How many adult tickets were sold that day?

7. ## Chemistry-Urgent

The partial pressure of CO2 inside a bottle of soft drink is 4.0 atm at 25°C. The solubility of CO2 is 0.12 mol/L. When the bottle is opened, the partial pressure drops to 3.0 ✕ 10-4 atm. What is the solubility of CO2 in the open drink? Express your

8. ## math

Calculate the volume of a steel bar which is 8cm long and 3.5cm in diameter

9. ## chemistry

Hello, I was confused on this chemistry problem and I was wondering if someone could please help me. 1) Consider the following chemical reaction: 2CH3OH(I) + 3O2 (g) → 2CO2(g) + 4H2O(I) Calculate the number of moles of CO2 produced when 11.25 mL of

10. ## chemistry

What volume of a 3.90 M KI stock solution would you use to make 0.430 L of a 1.25 M KI solution?

11. ## Algebra2

Does the relation in the table represent direct variation, inverse variation, or neither? if it is direct or inverse variation, write an equation to represent the situation. Explain your answer x 5, 10, 15, 20 Y 2, 1, 2/3, 1/2

12. ## Algebra

150g of sugar was used to make a bottle of 8% syrup. How much water was used to make this bottle of syrup? How much syrup is there in this bottle?

13. ## Math 104

There are 5 cyclists in a race. There will be a first-place and a second-place prize awarded. In how many different ways can the 2 prizes be awarded?

14. ## Chemistry

Recall the reactions for this lab: S2O82- + 2I- → 2SO42- + I2 (slow) Reaction 1 The one that delays the solution turning blue: I2 + 2S2O32- → 2I- + S4O62- (fast) Reaction 2 b. All the S2O32 is consumed when the color change occurs. Therefore, Δ[S2O32]

15. ## math

Justin is 3 years older then Sam, and Justin’s age in 2 years will be twice what Sam’s age was 3 years ago. Find their present ages. i got 14 and 17 but the answer is wrong

16. ## Geo

(SAT Prep) The diagonals BF and CE divide the hexagon ABCDEF into two equilateral triangles and a square. Find the perimeter of the hexagon if BF = 3 cm.

17. ## physics

A 2000kg car is slowed down uniformly from 20m/s to 5 m/s in 4s. What is the average total force on the car during this time.

18. ## chemistry

How many grams of CaCl2 would be dissolved in 1.1 L of a 0.17 M solution of CaCl2?

19. ## Math

Neil has a total of twelve \$5 and \$10 bills in his wallet. He has 5 times as many \$10 bills as \$5 dollar bills. How many of each does he have?

20. ## Math

The figure at right shows a long rectangular strip of paper, one corner of which has been folded over to meet the opposite edge, thereby creating a 30-degree angle. Given that the width of the strip is 12 inches, find the length of the crease.

21. ## Chemistry

Write the formulas of the compounds formed by NH4+ with the following anions: CN−, HCO3−, SO42−, HPO42−

22. ## math

Richard is 6 years older than Lisa, and in 5 years the sum of their ages will be twice as much as the sum of their ages 4 years ago. Find their present ages.

23. ## Maths

Three circles of radius 1 unit fit inside a square such that the two outer circles touch the middle circle and the sides of the square. Given the centres of the circle lie on the diagonal of the square, find the exact area of the square. I got the answer

24. ## Chemistry

Hello, I was hoping that I could get some help with calculating the mass needed to completely react with this question. In the following chemical reaction between H2 and N2 to produce NH3, what is the mass of N2 needed to completely react with 0.65 g H2 to

25. ## General Chemistry

A student mixed the following reactants, using the general procedure for the experiment: 10.0 mL of 0.10 M KI, 10.0 mL of 0.0010 M Na2S2O3, 20.0 mL of 0.040 M K2S2O8, and 10.0 mL of 0.10M HCl. It took about 75 seconds for the mixture to turn blue. a. By

26. ## CHEMISTRY

You carefully weigh out 20.00 g of CaCO3 powder and add it to 81.00 g of HCl solution. You notice bubbles as a reaction takes place. You then weigh the resulting solution and find that it has a mass of 92.80 g . The relevant equation is

27. ## Math

Mary is riding a merry-go-round, whose radius is 25 feet and which is turning 36 degrees per second. Seeing a friend in the crowd, she steps off the the outer edge of the merry-go-round and suddenly finds it necessary to run? At how many miles per hour

28. ## Maths

A farmer wishes to fence his field with 3 rows of wire.if the dimensions of the field are 120m by 68m,find the total length of wire required

29. ## Chemistry

which salt solution would have the highest ph and why KI,KBr,KF,KCL or they all have the same ph. Im leaning towards KF since im pretty sure the other salts are neutral?

30. ## Pre-Calculus

How do I solve the equation: 3 = 2.1 sin[(pi/6)t - 5pi/6] + 3.2

31. ## chemistry

calculate the number of molecules in 6.4g of so2. (b) 1.5 moles of hydrogen chloride

32. ## Chemistry

Recall the reactions for this lab: S2O82- + 2I- → 2SO42- + I2 (slow) Reaction 1 The one that delays the solution turning blue: I2 + 2S2O32- → 2I- + S4O62- (fast) Reaction 2 b. All the S2O32 is consumed when the color change occurs. Therefore, Δ[S2O32]

33. ## Geo

(SAT Prep) The perimeter of pentagon ABCDE is 30 in, AB = 7 in, BC = CD = 6 in, DE = 5 in. How many sides of the pentagon have equal length?

34. ## Chemistry

What are the molality and mole fraction of solute in a 30.1 percent by mass aqueous solution of formic acid (HCOOH)

35. ## chemistry

With reference to collision theory account for the colour change that occurred when HCl was added to K2CrO4 (Cromate)

36. ## Physics

The dipole moment of a water molecule is 6.37E-30 Cm. What is the electric potential's magnitude 1.58 nm from a water molecule along the axis of the dipole?

37. ## material science

What is the ratio of the maximum axial stress to the maximum bending stress in the inclined cell walls of hexagon honeycombs in terms of t,h ,l, and theta?

38. ## chemistry

What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)?

39. ## Maths bearing

City A is 300km due east of city B ..city C is 200km on a bearing of 123* from city B how far is it from C to A

40. ## Physics

When dots are placed on a page from a laser printer, they must be close enough so that you do not see the individual dots of ink. To do this, the separation of the dots must be less than Raleigh’s criterion. Take the pupil of the eye to be 2.9 mm and the

41. ## Chemistry

. A student mixed the following reactants, using the general procedure for the experiment: 10.0 mL of 0.10 M KI, 10.0 mL of 0.0010 M Na2S2O3, 20.0 mL of 0.040 M K2S2O8, and 10.0 mL of 0.10M HCl. It took about 75 seconds for the mixture to turn blue. a. By

42. ## Math

Using the Widmark equation, Write the equation you would solve to figure out how long it will take before his BAC is 0.08. Is it okay to round any constants to 3 decimal places.

43. ## chem

When 3.517 grams of a hydrocarbon, CxHy, were burned in a combustion analysis apparatus, 11.59 grams of CO2 and 3.164 grams of H2O were produced. In a separate experiment, the molar mass of the compound was found to be 40.06 g/mol. Determine the empirical

44. ## science

a body is released from the great height and falls freely towards the earth . another body is released from the same height , one second later . then the separation between the two bodies , two seconds after release of the second body is

45. ## Chemistry

What are the molality and mole fraction of solute in a 30.1 percent by mass aqueous solution of formic acid (HCOOH)

46. ## bio

a heterozygous tall pea plant is crossed with a short pea plant.what are the expected genotypic and phenotypic ratio for this cross

47. ## Differential equation

A spherical balloon remains spherical as it is slowly inflated. The radius of the balloon r (in cm) at time t (in seconds) satisfies the differential equation. Dr/dt = k/r^2 where k is a positive constant. When the radius is 3 cm, the radius is increasing

48. ## Maths,

A certain is to be shared among three brothers ,one of them gets 2/5 of it,another gets 1/4 of it and the third one gets #2.10k. How much is the sum of money?

49. ## Chemistry

What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)? (Explain how you got the answer please)

50. ## Physics

2300 Joules is used to lift a wheelbarrow through 4 meters up an inclined plane into a container. Why does the man use more joules (3500 J) to push the wheelbarrow?

51. ## Chemistry

Hello, I really don't understand how to find the grams of moles in some of these reactions. If someone could help I would appreciate it. 1) Balance the following chemical reaction and determine the number of moles of HI produced when 2.33 moles of H2(g)

52. ## probability

Tad draws three cards at random, without replacement, from a deck of ten cards numbered 1 through 10. What is the probability that no two of the cards drawn have numbers that differ by 1? Express your answer as a common fraction.

53. ## chemistry

Balance the following chemical reaction and determine the number of moles of HI produced when 2.33 moles of H2(g) are consumed in the following chemical reaction: ___H2(g) + __I2(g) -> ___HI (g)

54. ## Math

In a book closet, mathematics books are kept in stacks of 4. If each student carries no more than one stack, what is the least number of students needed to carry books for a class of 23? Your multiple choices are a. 5 students b. 6 students c. 27 students

55. ## Math

A segment that is a units long makes a C-degree angle with a segment that is b units long. In terms of a, b, and C, find the third side of the triangle defined by this SAS description.

56. ## Calculus II

Find the centroid (x¯,y¯)(x¯,y¯) of the region bounded by: y=5x^2+6x y=0 x=0 x=6 I know the integral (think, at least) is from 0 to 6 and between the first and second equation given, but I missed this lecture and have no idea how to find the center of

57. ## Math

A swimming pool is 25m long, 10m wide and 2m deep what is the volume

58. ## algebra

complete table for the following equation 2x+y=9 x y -3 1 4 5 -1

59. ## chemistry

A 8.408 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 12.53 grams of CO2 and 3.849 grams of H2O are produced. In a separate experiment, the molar mass is found to be 118.1 g/mol. Determine the empirical

60. ## Chemistry-Urgent

What is the percent by volume of ethanol in a solution that contains 26 mL of ethanol dissolved in 113 mL of water? explain please

61. ## Algebra

Chloe wants to invest a total of \$39000 into 2 savings account, one paying 6% per year in interest and the other paying 9% per year in interest (a more risky investment). If after 1 year she wants the total interest from both accounts to be \$2730. How much

62. ## Chemistry

What are the molality and mole fraction of solute in a 30.1 percent by mass aqueous solution of formic acid (HCOOH) can you please explain it better? I still don't quite understand

63. ## chem

What are the molality and mole fraction of solute in a 25.5 percent by mass aqueous solution of formic acid (HCOOH)? work this one out please i didnt understand

64. ## Physical Science

MH = 16.32 g/kg SH = 9.86 g/kg Air mass temperature = 15° C (59° F) What is the Relative humidity & the approximate Dew-point temperature? How do i set this problem up? I do not understand. Thanks

65. ## Chemistry 121

. Using your calculated value for molar heat of reaction, how much heat would be given off in kilojoules if 3.0 grams of magnesium were to react with excess hydrochloric acid. Show work for your calculation. Value is 31.304 kJ/mol Mg

66. ## Math

Mr. shows bought movie tickets for the members of his family and spent \$12.50 on popcorn. He spent a total of \$46.25 for his family to go to the movies. How many tickets did he buy? (Write an equation containing a variable and solve)

67. ## math

Problem 1:A semi-circular garden has a radius of 10 meters. What is its area? ( Use pi =3.14) Answer:157m^2 Problem 2:The base of a cylindrical tank has a radius of 4.5 meters. What is its area? ( Use pi=3.14) Answer:65.585m^2 Problem 3:In the middle of a

68. ## fractions

Sam saved 4/7 of his paycheck and spent 2/5 of the remaining money. He was then left with \$9. What was the original value of Sam's paycheck?

69. ## Math

Peanuts, walnuts, and cashews are mixed by volume in the ratio 5:3:2, to make a party snack. The number of cups of walnuts needed to make 12 cups of party mix are between: a) 1 and 2 b) 2 and 3 c) 3 and 4 d) 4 and 5

70. ## civic education

List six And explain internal limitation of human right And six external limitation of human right

71. ## Algebra

Find three consecutive integers whose sum is 138 by writing and solving an equation.

72. ## Math

Raoul got to spin this spinner ,to see what chorehe had to do Saturday morning. He could wash the dishes, wash the car,wash the dog,or change the paper in the rabbit cage.what is the chance he will have to wash something Saturday morning. As a fraction and

73. ## Chemistry

If you have 1911.9 g of a bleach solution. The percent by mass of the solute sodium hypochlorite NaOCl is 3.62. How many grams of NaOCl are in the solution

74. ## Math

If the volume of a given cube is 512cm. What is the length

75. ## math

A lawn50m.long and40m.broad has a path of uniform width 8m. outside it.Find the area of the path.

76. ## Math

In a book closet, mathematics books are kept in stacks of 4. If each student carries no more than one stack, what is the least number of students needed to carry books for a class of 23?

77. ## Math

Which is a reasonable estimate? 2/3 + 4/5 a.

78. ## Math

Ryan needs 8 5/16 feet of molding to finish a closet. He has 6 feet of molding. How many more feet of molding does he need?

79. ## Chemistry

You have 1683.8 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of NaOCl are in the solution? (show work Please)

80. ## Astronomy

OK I have no clue how to do this . Can you believe that it is about -360¤F on Neptune,about -357¤F on Uranus? BRRRR ! That's cold! What is the temperature outside today in your town? How much warmer is it in your town than on Neptune? How much warmer is

81. ## Chemistry

What volume of a 4.50 M KI stock solution would you use to make 0.455 L of a 1.25 M KI solution?

82. ## Math

Make c the subject c=ne/R±nr

83. ## chemistry

What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water? Just making sure would it be 11.1 divided by 2269.2 times 100?

84. ## maths

Find the smallest positive 2 digit whole no which is divisible by 3 such that the sum of it digit is 9.

85. ## physics

how is energy conserved ith a spring and box on a ramp. does 1/2kx^2 still equal gpe? what if the spring displacement is the same but the angle of the ramp changes, causing the gpe to change. how is energy conserved since the gpe is lower than before but

86. ## Math

Mr. shows bought movie tickets for the members of his family and spent \$12.50 on popcorn. He spent a total of \$46.25 for his family to go to the movies. How many tickets did he buy. (Write an equation containing a variable and solve) this is all the

87. ## science

what are all the types of clouds

88. ## algebra

Finde three consecutive integers such that the sum of the first and third is 16

89. ## Chemistry-Urgent

What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water?

90. ## maths

23m round off to the nearest 5m

91. ## chem

0.210 mole of Na2CO3 in 200.0 mL of solution

92. ## math

Give an example of an open interval, and an example of a set that is not an open interval. Use proper set notation and explain.

93. ## Physics

2300 Joules is used to lift a wheelbarrow through 4 meters up an inclined plane into a container. Why does the man use more joules (3500 J) to push the wheelbarrow?

94. ## english

a good debatable thesis for A good citizen A good citizen is honest and works hard so they could provide for the family

95. ## Math

While solar energy powered home systems are quite expensive to install, adding some passive energy features to conventional construction can make a substantial reduction in heating and cooling costs. Passive solar requires no machinery and uses the

96. ## Physics

A 50 ohm resistor consists of a copper portion joined to carbon portion, the resistance of the resistor being the sum of the resistance for 2 portions. Find the resistance of the copper portion of the resistor so that the combined resistance will be

97. ## biology

a. what are the composition in nutrient broth? b. give 5 different types of media used for cultivation of microbes and define each?

98. ## chemistry

You have 1683.8 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of NaOCl are in the solution?

99. ## Algebra I

3 bags of chips and 5 bottles of water cost \$31. A chip costs one dollar less than 3 bottles of water. Find the cost of each.

100. ## Organic Chemistry

Draw only the different stereoisomers for the following compounds: a) 2,4-diiodohexane b) 1-s-butyl-3ethylcycloheptane

101. ## Organic Chemistry

Draw all the possible conformations for the following compounds and rank their stability (#1 least stable). a) 3-chloro-2-methylpentane rotating between c-3 and c-4 b) 1-cyclopropyl-2-flurocyclohexane

102. ## Physics

17 km due north, then at 7° south of east, and then 15 km at west of south

75 km at 25° north of east, then 75 km at 65° south of west, and then 75 km due south

104. ## physical science

How many minutes would be required for a 310.0 W immersion heater to heat 202.0 g of water from 22.0°C to 95.6°C?

105. ## Differential equations

Good morning. Quick question. dr/dt=K/r^2 When the radius is 3cm, the radius is increasing at a rate of 5/36pi. Use this fact to find the constant K. I know that the general form of these growth factors is e^kt but im not sure where the rate and the

106. ## Physics

calculate K.E in Joules of a baseball w/ a mass of 237.2 cg moving at 85.00 mph

107. ## fractionss

The Burger Barn served 24 customers yesterday. 1/2 of the customers ordered breakfast. 1/3 of the remaining customers ordered take-out. The rest of the customers ordered dessert. How many customers ordered desert

108. ## math

one half of jeans age two years from now plus one third of her age three years ago is twenty years. how old is she now?

109. ## chemistry

how many moles of co2 produced when 3 moles of hcl react with caco3

111. ## Science

What is methanol?

112. ## maths

A boat covered the distance of 450km in 13/2 hrs. if the boat covers thefirst two third of the distance at the speed of 75km/hrs then at what speed would itcovers the remaining distance.

113. ## physics

I'm not sure with this conversion... getting 9.843x10^4 ft/min to m/s ? How do I get to m/s using a specification conversion without using online conversions?

114. ## physics

Last one! Thankyou for the help thus far... calculate the KE in kJ of 9.100 x 10^5 atoms of silver moving at 1800. km/hr. ... the atoms part is what I'm confused about.

115. ## Calculus

Please help me solve these problems. 1.Find the inverse function (f^-1) of √3x-2 2. Integration ∫ the top is x while the bottom is 1. (sin(t))/t dt

116. ## math

B owes \$3000 due 2 years from today without interest and \$2000 with interest at 4% compounded quarterly due in 6 years from today.if money worth is 5% compounded semiannually what single payment made 4 years from today will discharge his debts?