# Questions Asked onJune 5, 2013

1. ## math

A radio station's signal has a radius of 100 miles. If you drive at a constant speed of 40 miles an hour, nonstop, directly across the diameter of the signal, how long can you listen to the station before the signal fades?

2. ## Chemistry

Automobile air bags employ a chemical reaction involving the rapid decomposition of sodium azide (NaN3) into sodium metal and nitrogen gas to inflate in a collision. How much sodium azide is required to decompose to inflate a 20.0 L air bag? Assume that

3. ## Physics

Two wires are identical, except that one is aluminum and one is copper. The aluminum wire has a resistance of 0.835. What is the resistance of the copper wire? Take the resistivity of copper to be 1.72 x 10-8 Ω·m, and that of aluminum to be 2.82 x 10-8

4. ## Maths

Hi, I am just doing some maths revision in light of my maths GCSE resit, which is very soon. I am sitting the higher paper for the first time, so some of the questions towards the end of the paper are very testing of my knowledge. At the moment I am going

5. ## chemistry

As pure elements. all of the halogens are diatomic molecular species. their melting points are: F2, 85 K, Cl2 239 K, Br2 332 K, and I2 457 K. using periodic table, how can i predict the molecular formula of elemental astatine. at the only radioactive

6. ## Math - Decimals

Is 0.052 or 0.05 a bigger number?

7. ## Chemistry

If iridium has a density of 23.3 g/cm3 and forms a face-centered cubic lattice, what is the atomic radius of the iridium atom? a. 135.7 pm b. 203.7 pm c. 271.4 pm d. 648.0 pm

8. ## Physics

A block of mass m1=1.6kg, initially moving to the right with a velocity of +4m/s on a frictionless horizontal track, colides with a massless spring attached to a second block of m2=2.1kg moving left with a velocity of -2.5m/s. The spring constant is 600

9. ## Math

2 cm green square is painted on a triangle with a base of 6 and a height of 7. A dot will be randomly placed on the triangle. What is the probability the dot will be placed outside of the square?

10. ## physics

A solid sphere of mass 2 kg is rolling without slipping on a table with linear speed of 0.5 m/s. Calculate its total kinetic energy.

11. ## Math

John ran 600 meters at baseball practice.How many centimeters did he run?

12. ## physics

consider the 52 kg climber. find the tension in the rope and the force that the climber must exert with her feet on the vertical rock face to remain stationary. assume that the force is exerted parallel to her legs. also, assume negligible force exerted by

13. ## Thermodynamics

An empty cannister of 0.002 m3 is filled with R-134a from a line flowing saturated liquid R-134a at 0°C. The filling is done quickly so it is adiabatic, but after a while in storage, the can warms up to room temperature, 20degC. Find the final mass in the

14. ## Math

A spinner with three equal spaces (labeled A,B, and C) is spun. If the spinner lands on A or C a coin is flipped. If the spinner lands on B a standard 6-sided dice is rolled. What is the probability of spinning a B and rolling a prime?

15. ## Chemistry

Which of the following electron configurations belongs to an atom that is most likely to be involved in a covalent bond? a. 1s22s22p63s2 b. 1s22s22p6 c. 1s22s22p63s23p3 d. 1s22s22p63s23p6

16. ## language arts

compare and contrast the giver and the truman show

17. ## Chemistry

Limestone (CaCO3) emits CO2 gas when exposed to HCl. What is the theoretical yield of CO2 if 56.1 grams of limestone is completely dissolved in HCl? CaCO3(s) + 2 HCl(aq) R CaCl2(aq) + CO2(g) + H2O(l) a. 21.5 g b. 4.16 g c. 9.53 g d. 24.7 g

18. ## wilson

Andrea is as talented as any person I know.

19. ## Math

12+12=9 25+25=49 18+18=81 29+29=???????

20. ## Chemistry

How long will it take to collect 1.0 L of H2(g) at STP in the electrolysis of 2.0 M HCl with a current of 4.25 A? a. 15 min b. 34 min c. 2.8 hr d. 11 hr

21. ## physics

A tennis ball is flying horizontally across the net. Air resistance is not negligible. Identify the forces on the ball

22. ## HELP!!! Math

If a varies jointly as b and the square root of c, and a = 21 when b = 5 and c = 36, find a when b = 9 and c = 225.

23. ## Math>> Help!!

Seats for Mathematics, Physics and Biology in a school are in the ratio 5:7:8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of increased seats?

24. ## math

Mike,Liz,and Danna are friends.They each measured the length of the sidewalk in front of their school for a project.Which friend do you think measured incorrectly? Mike -measured 280 inches Liz measured 24 ft. Danna measured 8 yards

25. ## Physics

A winch is capable of hauling a ton of bricks vertically two stories (6.50 ) in 22.5 If the winch’s motor is rated at 5.00 , determine its efficiency during raising the load.

26. ## math

Barbara Sultan works 40 hours per week as a registered nurse. At the rate of \$31.50 per hour, what are her gross weekly earnings

27. ## english

What grammatical structure is the italicized portion of the sentence? By serving as a popcorn vendor, Don saw many good games. present participial phrase nominative absolute appositive past participial phrase prepositional phrase with a gerund

28. ## economics

how managerial economics is related with economics?

29. ## science

The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water?

30. ## Chemistry

A "neon" sign contains 2.4¡Ñ10^2mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign?

31. ## Math

A spinner with three equal spaces (labeled A,B, and C) is spun. If the spinner lands on A or C a coin is flipped. If the spinner lands on B a standard 6-sided dice is rolled. What is the probability of spinning a B and rolling a prime?

If c varies directly as the square root of d, and c = 14 when d = 64, find c when d = 324.

33. ## HELP!!! Math

The volume of a pyramid varies jointly as its height and the area of its base. A pyramid with a height of 12 feet and a base with area of 23 square feet has a volume of 92 cubic feet. Find the volume of a pyramid with a height of 17 and a base with an area

34. ## Chemistry

Which of the following electron configurations belongs to an atom that is most likely to be involved in a covalent bond? a. 1s^22s^22p^63s^2 b. 1s^22s^22p^6 c. 1s^22s^22p^63s^23p^3 d. 1s^22s^22p^63s^23p^6

35. ## Chemistry

What is the molecular geometry of PCl3 a. trigonal pyramidal b. see-saw c. tetrahedral d. T-shape

36. ## math

Two runners are competing in a race. One runner averages a pace of 7 minutes per mile and finishes the race in 28 minutes. The second runner finishes the race in 30 minutes. Which of the following is the pace of the second runner?

Wind resistance varies jointly as an object's surface area and velocity. If an mile per hour with a surface area of 25 square feet experiences a wind resistance of 225 Newtons, how fast must a car with 40 square feet of the surface area travel in order to

38. ## Chemistry

As an electron moves closer to the nucleus, energy is: a. absorbed b. released c. remains unchanged d. transformed into a proton

39. ## Chemistry

Large jumps in ionization energy tend to occur whenever the removal of that electron disrupts an electron configuration ending in: a. ns^2 b. ns^1 c. np^6 d. np^4

40. ## math

If RS=8y+4, ST=4y+8, and RT=36, find the value of y.

41. ## Engineering

A tapered thin-wall circular shaft has constant wall thickness, t, length L, and diameters linearly varying between dA at the support A(x=0) and dB at its free end B(x=L). The shaft is homogeneous with shear modulus G HW6_1A : 20.0 POINTS Obtain a symbolic

42. ## Biology

Describe how you would prepare 10 mL each of 2 M, 1.5 M, and 1 M NaCl solutions from a 2 M stock NaCl solution. Describe your actions–exactly what you would do –step-by-step–when preparing this solution. Also show all calculations. Be sure all

43. ## math

Which is the best estimate for the length of a house? A.12 yards B.12 feet C. 12 miles D.12 inches

44. ## Chemistry

Large jumps in ionization energy tend to occur whenever the removal of that electron disrupts an electron configuration ending in: a. ns2 b. ns1 c. np6 d. np4

45. ## math

Mitch Anderson is a security guard. He earns \$7.45 per hour for regular time up to 40 hours, time-and-a-half for overtime, and double time for the midnight shift. If Mitch worked 56 hours last week, including 4 hours on the midnight shift, how much were

46. ## math

how much water is needed to add to a half-pint of syrup with 60% sugar to obtain a drink with 5% sugar?

1. The old couch needed some new upholstery. What does the word upholstery mean in the sentence above? (1 point) fabric curtains pillows*** legs 2. The pet owner had many feline companions. What does the word feline mean in the sentence above? (1 point)

48. ## Physics

1. A car is traveling at 85km/h, find the following: A) Its speed in m/s u = 85km/h = 85km/h * 1000m/km/ 60s/min * 60min/m/h = 85000/ 3600 = 23.61 ANS = 23.61m/s B) How many meters will it travel in 8 seconds = 23.61m/s * 8s ANS = 188.88m C) How long (in

49. ## Algebra

A \$130,000 home bought with a 20% down payment and the balance financed for 30 years at 7.5% Find the monthly payment for the loan

50. ## Physics

A 1.40- block is on a frictionless, 20 inclined plane. The block is attached to a spring ( = 40.0 ) that is fixed to a wall at the bottom of the incline. A light string attached to the block runs over a frictionless pulley to a 60.0- suspended mass. The

51. ## Science

Solar panels turn ___ energy into __ energy heat into electric?

52. ## statistics

Suppose that 30% of all telephone calls at work are for personal reasons. If a random sample of 15 is taken, let X be the number of personal calls. The standard deviation of the # of personal calls is:

53. ## life orientation

Identify one enviromental or human factor that causes ill health or accidents within your community

54. ## Movie Essay Topic Help?

Hi, I need to write a essay/narrative/anyotherstyleofessay for the movie "Lean on Me" with Morgan Freeman. I was wondering, if any of you guys have seen it, what would be a good topic to write about? Thanks

55. ## Physics

7) An apple falls from a tree (h = 9m). In the absence of air resistance, how fast is it traveling when it strikes the ground?

56. ## Calculus

Use Green's theorem to evaluate the integral: y^(2)dx+xy dy where C is the boundary of the region lying between the graphs of y=0, y=sqrt(x), and x=9

57. ## PHI 208

Many philosophers insist that our most strongly held beliefs should be examined and critically evaluated. Using the required text and outside sources, explain what philosophers mean when they say that beliefs need justification? What is the importance of

If a family planned to spend \$370 for food during March but only spent \$344, this difference would be referred to as a:

59. ## accounting

On November 30, the payroll register of Webster & Smith indicated the following information: Determine the amount of Social Security and Medicare taxes to be withheld. Round your answers to one decimal place. Social Security Tax=\$ Medicare Tax=\$136,30 I

Cobalt was used as an internal standard to analyze a sample of titanium with atomic absorption spectroscopy. A mixture was prepared by combining a 4.00 mL Ti solution of unknown concentration with 3.00 mL of a 11.7 micrograms/mL solution of Co. The atomic

61. ## HELP!!! Math

The weight of an object on Earth varies directly as the weight of the same object on the moon. A 300 pound object would weight 48 pound on the moon. How muchg would a 65 pound object weigh on the moon?

62. ## algebra

For how many pairs of positive integers n and k with n and k less than or equal to 20, is the number (2n)!(2k)!n!k!(n+k)! an integer?

63. ## HELP!!! Math

Given the relation A = {(5,2),(7,4),(9,10),(x,5)}. What is the value of x that will make relation A a function?

64. ## Chemistry

What is the pH of a 0.200 M solution of HNO3? a. 0.70 b. 1.31 c. 6.18 d. 8.53

65. ## Chemistry

A "neon" sign contains 2.4¡Ñ102mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign? a. 6.5¡Ñ10^21 b. 2.8¡Ñ10^22 c. 3.2¡Ñ10^24 d.

The sales department tells management that they can increase revenue by 20 percent by increasing sales 20 percent, but the production department says that to achieve that number of units, they will have to buy a new piece of equipment that will add

67. ## math

Find the sum of all positive integers m such that 2^m can be expressed as sums of four factorials (of positive integers). Details and assumptions The number n!, read as n factorial, is equal to the product of all positive integers less than or equal to n.

68. ## calculus

A conical party hat made out of cardboard has a radius of 4cm and a height of 12cm. When filled with beer, it leaks at the rate of 4cm^3/min. (a)At what rate is the level of the beer failing when the beer is 6cm deep? (b) When is the hat half empty?

69. ## Physics

A block of weight 30N lies on a horizontal table top. A force of 40N acts parallel to the surface of the table top, but does not cause the block to move. What is the magnitude of the frictional force between the block and the table?

70. ## Precalculus

Given f(x)=(2x+3)/(3x^2+7x-6) find the equations of any vertical, horizontal, or oblique asymptotes.

71. ## Math

A 20 foot ladder is leaning against a building. If the ratio of the base of the ladder's distance from the building to its top's height from the ground id 3:4, find how high the top of the ladder is from the ground.

72. ## Math

The area of a trapezium is 360 in2. If the ratio of the bases to the height is 6:10:5, find the dimensions of the trapezium.

73. ## chemistry

briefly explain the problem that will be created if you (a) mark the origin line with a washable flet-tip markromatogram until after you discover that the solvent front has reached the top of the paper.

74. ## Math>> Help!!

A 20 foot ladder is leaning against a building.If the ratio of the base of the ladder's distance from the building to its top's height from the ground is 3:4, find how high the top of the ladder is from the ground.

75. ## HELP!!! Math

The area of a trapezium is 360 in^2. If the ratio of the bases to the height is 6:10:5, find the dimensions of the tarpezium.

76. ## math

Express (15x^2+5x+2)/(2-x)(1+2x^2) in partial fractions.

77. ## math

Express (15x^2+5x+2)/(2-x)(1+2x^2) in partial fractions.

78. ## math

Express (15x^2+5x+2)/(2-x)(1+2x^2) in partial fractions.

79. ## science,

1,3,5,2 ORDER IT

80. ## heeeeeeeeeeeelp physics

Estimate the time difference between the longest day and the shortest day of a year in seconds if you lived on the Earth's equator with the assumptions below. Note: this is not the difference between solstices as we are adjusting the earth's rotation axis

81. ## calculus 2

Test the series for convergence/divergence. The Summation from n=1 to infinity of: 1*3*5...(2n-1)/(2*5*8...(3n-1) I'm not sure what to do with the extra terms on the left.

82. ## English

Which of the following APA citations for a book with one author is correct? A. Percy, William Byrnes (1961). The Moviegoer. New York: Knopf. B. Percy, W. (1961). The Moviegoer. New York: Knopf. C. Percy, W., 1961. The Moviegoer. New York: Knopf. D. Percy,

83. ## Math Trigonometry

What is the maximum integer value of n, where n

84. ## Physics/Mechanics

tapered thin-wall circular shaft has constant wall thickness, t, length L, and diameters linearly varying between dA at the support A(x=0) and dB at its free end B(x=L). The shaft is homogeneous with shear modulus G HW6_1A : 20.0 POINTS Obtain a symbolic

85. ## Foreign Language Translation French

Le garcon n'a pas de stylo- does this mean "the boy does not have a pen?"

86. ## fundamentals

Calculate the total constant force needed to accelerate a vehicle with mass 1400kg and tractive resistance of 320N from 19km/h to 95km/h over a distance of 0.8km on a horizontal plane.show working?

87. ## College Algebra

When using the Quadratic formula, why is only necessary to examine the discrimant to determine if the equation only has real numbers?

88. ## english

Hey you :) Can you please read that letter to my host family? Can you maybe give me tips what I can add? what I don't have to say? And look up the grammar? Thank you Minnie Dear Host Family, My name is Minnie. I’m 21 years old, my birthday is on 2nd

89. ## College Algebra

Suppose that the Quadratic equation had two X-intercepts. How could you use the intercepts to find the vertex?

90. ## Pre-Calculus

How to write this conic section in standard form? 3y^2 = 108 - 12x^2

91. ## Pre-Calculus

How to write this conic section in standard form? 3y^2 = 108 - 12x^2

92. ## Math

Determine 208/207+(208/207×206/205)+(208/207×206/205×204/203)+..+(208/207×206/205×204/203..4/3*2/1)

93. ## Math

A rectangle has a length that is 1 less than twice its width. It's area is 21. Find its perimeter.

94. ## chemistry

Whadetermines the behavior of an amphoteric compound?

95. ## Math

Mr foster places 11 garden lights along an 80 meter path. Each light is placed an equal distance apart. How far away is the sixth garden light from the second?

96. ## math

Find the number of decibels for the power of the sound given. Round to the nearest decibel. A rocket engine, 2.33 10−5watts/cm2

97. ## Math - Factorising

Find the quotient and the remainder in the following. a). x^4 + 3x^3 + 5x^2 - 6x - 8 is divided by x + 2 b). 2x^4 - 3x^3 + 6x^2 - 5x - 4 is divided by 2x - 3 Please help, this is urgent. Thanks.

98. ## math

For a positive integer x, let f(x) be the function which returns the number of distinct positive factors of x. If p is a prime number, what is the minimum possible value of f(75p2)?

99. ## Maths - factorising

Find the quotient and remainder in the following: a) x^4 +3x^3 + 5x^2 - 6x - 8 is divided by x + 2

100. ## math

How many ordered pairs of positive integers 1≤k≤n≤50 are there, such that k divides n, and (n/k)!=n!/k!?

101. ## HELP!!! Math

The area of a yard is 15000 ft^2. If the ratio of the lenght to the width of the yard is 3:2, what are the dimensions of the yard?

102. ## math

Express (15x^2+5x+2)/(2-x)(1+2x^2) in partial fractions.

103. ## math

Express (15x^2+5x+2)/(2-x)(1+2x^2) in partial fractions.

104. ## math

Express (15x^2+5x+2)/(2-x)(1+2x^2) in partial fractions.

105. ## HELP!!! Math

If y varies jointly as x and z, and y = 33 when x = 9 and z = 12, find y and x = 16 and = 22.

106. ## maths

Determine 208/207+208/207×206/205+208/207×206/205×204/203+…

107. ## algebra

For a positive integer x, let f(x) be the function which returns the number of distinct positive factors of x. If p is a prime number, what is the minimum possible value of f(75p2)?

108. ## help math!

A curve has equation: 3siny + 4cosy = xy + x^2 Q:find dy/dx in terms of x and y.

109. ## Chemistry

Name each compound. /\/\NH2 (that's suppose to be a line diagram...) I got 1-pentanamine, but that's wrong. CH3CH2-O-CHCH2CH3 .....................| ..................CH3 I'm not sure how great this will turn out, but there's supposed to be a CH3 branching

110. ## Calculus

4. Find the volume of a pyramid of height 160 feet that has a square base of side 300 feet

111. ## Biology

What are the three main type of producers?

112. ## Math

Which of the following holds about 1 liter of water spoon,glass ,pot, or eye dropper?

113. ## heeeeeeeeeeelp math

The integers from 1 through 10 (inclusive) are divided into three groups, each containing at least one number. These groups satisfy the additional property that if x is in a group and 2x≤10, then 2x is in the same group. How many different ways are there

114. ## plllllllllls help math

ABCD is a convex quadrilateral with AC and BD intersecting at E. F is a point on AD such that EF is parallel to CD. It is given that the circumcircle of triangle AED is tangential to DC. If FD=336 and FA=420, what is ED?

115. ## math pls hurry

A car travels 60 km in 1hr 30min.how long will it take to cover a distance of 100km at the same speed?

116. ## heeeelp math

For each positive integer n, let Hn=1/1 + 1/2 +⋯+ 1/n . If ∑ (up)∞ (base)(n=4) 1/n*Hn*H(n-1)= a/b for relatively prime positive integers a and b, find a+b.

117. ## Chemistry

How many liters of nitric acid are needed to neutralize 25mL of 4.2M calcium hydroxide?

118. ## Pre-calculus

Explain how the graph of f(x)=(-2)/(x-3)^2 can be obtained from the graph of y=1/x^2 by means of translations, compressions, expansions, or reflections.

119. ## chattco

Dave's age in 4 years is 18. Write an equation that represents Dave's age in 4 years. Use the variable, d, to represent Dave's age

120. ## Chemistry

A "neon" sign contains 2.4¡Ñ10^2mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign? a. 6.5¡Ñ1021 b. 2.8¡Ñ1022 c. 3.2¡Ñ1024 d.

121. ## Chemistry

A "neon" sign contains 2.4¡Ñ10^2 mL of argon. Assuming that the gas is at standard temperature and pressure, there is 1.00 moles of gas per 22.4 L of volume. How many argon atoms are present in this sign? (a). 6.5¡Ñ10^21 (b). 2.8¡Ñ10^22 (c).

122. ## Science

7) An apple falls from a tree (h = 9m). In the absence of air resistance, how fast is it traveling when it strikes the ground?

123. ## math

If you begin with 3000 fish in a pond and 20% die off each year, yet 1000 more are added each year, how many would you end up with at the end of 10 years?

124. ## math

A whole number which will divide exactly into another whole number.

125. ## Math Polynominal

The following three sets A,B and C satisfy A ⊂ B and C ⊂ A: A={x∣(x−3)(x^2−20x+75)>0}, B={x∣x>α}, C={x∣x>β}. If the maximum value of α is a and the minimum value of β is b, what is the value of a+b?

126. ## Chemistry - DrBob222

When sodium burns in air it produces a bright white light and heat energy 2Na + O2 2Na2O ?H = -414kJ/mol What would you expect to be the heat energy associated with the reverse process 2Na2O 2Na + O2 Can you please show the entire calculation with units

127. ## fundamentals

A playground has its highest point 2.2m above the lowest point, and the slide is 4.9m long. If the average resistance to motion is one-fifth of the weight of the child(mass 40kg), find the speed at which the child reaches the bottom show working?

128. ## Physics

1. A train traveling at a speed of 150km/h decelerates for 15 seconds. During that time it travels 400 meters. A) What is the acceleration? = m/s^2 B) What is its speed after deceleration? = km/h I need help with which formula to use and how to use it to

129. ## math

(a)Given the points P(3,5),Q(8,10)and R(8,0),find the equation of a line which is perpendicular to QR and passes through the mid point of QR. (b)The line 2x+3y=2 and 7x-3y=10 intersect at A . Find the equation of the line which passes through A and is

130. ## chemistry

if a 10 mL of the original 1.0M stock solution was added to a 500mL volumetric flask and diluted to the mark, what would be the new concentration?

131. ## physics

A car moving with a velocity of 24meters per seconds,acceleration for 15seconds at a rate of 1meter per second square,calculate the final velocity of the car

132. ## PLIZ VERY URGENT

Use implicit differentiation to show that a function defined implicitly by sin x + cos y = 2y has a critical point whenever cos x = 0. Then use the first derivative test to classify those critical numbers that lies in the interval (−2, 2) as relative

133. ## Geometry

To the nearest inch, what is the diameter of a minipizza if two minis have the same area as one 16-inch pizza?

134. ## Math

The ratio of the length of an altitude of an equilateral triangle to its base is A. 1:1 B. 1:2 C. 1:3 D. Square root of 3: Square root of 2 E. None of these

135. ## Pre-calculus

Given f(x)=6x^4-7x^3-23x^2+14x+3, approximate each real zero as a decimal to the nearest tenth.

136. ## ELA

I have an 89, 83, 82, and 74 for school year. I got a 59 on final which is worth 20%. what is my average?

137. ## Math

The area of a yard is 15000. If the ratio of the length to the width to the depth is 4:2:1, what are the dimensions of the pool?

138. ## Math

Given three vertices (3,5), (0,0), and (6,0). Which of the following could be the fourth? A (3,-5) B (9,5) C (-3,5) D (-3,-5)

139. ## probabilities

What is the probability of obtaining tails or a five

140. ## Math

Factorise : 1 + a + b + c + ab + bc + ca + abc

141. ## calculus

What is the antiderivative of. 3X/x^2?

142. ## math

Find the sum of all positive integers m such that 2^m can be expressed as sums of four factorials (of positive integers).

143. ## math

The integers from 1 through 10 (inclusive) are divided into three groups, each containing at least one number. These groups satisfy the additional property that if x is in a group and 2x≤10, then 2x is in the same group. How many different ways are there

The volume of a pool is 1728 ft^3. If the ratio of the lenght to the width to the depth is 4:2:1, What are the dimensions of the pool?

145. ## math

The integers from 1 through 10 (inclusive) are divided into three groups, each containing at least one number. These groups satisfy the additional property that if x is in a group and 2x≤10, then 2x is in the same group. How many different ways are there

146. ## Math>> Help!!

If y varies as x, and x = 9 when y = 15, find y when x = 33.

147. ## maths

Find the smallest number N such that: The number of divisors of N is A. The number of divisors of A is B. The number of divisors of B is C. The number of divisors of C is 3.

148. ## Geometry

Triangle ABC has side lengths AB=8, BC=12 and CA=14. Given that D, E and F are midpoints of BC, CA and AB, respectively. Find the value of AD^2+BE^2+CF^2.

149. ## Math>> Help!!

A sum of money is to be distributed amoung A,B,C,D in the proportion of 5:2:4:3. If C gets K1000 more than D, waht is B's share?

150. ## Calculus

(c) find the integral of e^x/ e^3x + e^x dx

151. ## Calculus

(c) find the integral of 1/squrt (x^2+2x+10) dx

152. ## Calculus

Find the integral of sin(x) cos(x)/sin^2(x)-4 dx

153. ## Physics

All answers should be in degrees. (a) Using the result of Lecture 31 Question 3, and Snell's law, derive and evaluate for the secondary rainbow for the following values of the incidence angle and index of refraction . 1 , 1.4 incorrect 45 , 1.3 incorrect

154. ## Calculus

(c) y=x2,y=2−x,and the vertical linex=2

155. ## Calculus

3. Find the volume of the solid with cross-sectional area A(x) = 10 e^0.01x, 0 ≤ x ≤ 10.

156. ## Calculus

5. Find the volume of the solid generated by revolving the region bounded by y = x2, y = 0 and x = 1 about (a) the x-axis (b) the y-axis

157. ## English

To “elide” text is to ___________ text. A. plagiarize B. misspell C. omit D. verify is it C

158. ## estimate with whole nubers

Susie has a part-time job at the video store. She makes between \$40.00 and \$47.00 a day. Which is a reasonable amount of money that Susie makes for working 6 days?

159. ## heeeeeeeeeeelp math

Calvin and Dan are playing a game of chance. Calvin tosses 8 fair coins, and wins if he obtains at least 4 heads. The probability that Calvin wins can be expressed as a/b where a,b are coprime positive integers. What is the value of a+b?

160. ## math

The ratio of girls to boys in a class is 2:3, and you know there are 6 girls, how many boys are in the class?

161. ## Math

If the total expenditure was 2.5 million euros determine: 1) cost of administration (which is 20%): i did 20x2.5 million divided by 100 2) by how much thr expenditure on production (30%) exceeded that of selling (25%)

162. ## Chemistry

The ratio of isotopes for a given element can be measured instrumentally using a(n) ____________________.

163. ## Grammar

I want to give my Algebra teacher a letter to show how much her effort on helping me learn made me appreciate her and I just want to know if this sounds okay. Dear (my teacher's name), I just wanted to take some time to express how much I enjoyed being in

164. ## Math Trigonometry

Let f(x)=cos(pi*x/3) g(x)=1^x+(−1)^x h(x)=f(x)⋅g(x) where x is a positive integer. Given that h(x) has a range of exactly 3 different values: a, b and c, what is the value of a^2+b^2+c^2?

165. ## Chemistry

The lower the pH of a weak acid, the: a. higher the concentration of the weak acid. b. higher the dissolved H2(g) concentration. c. higher the Ka of the acid. d. none of the above

166. ## Chemistry

The ratio of isotopes for a given element can be measured instrumentally using a(n) ____________________.

167. ## Approapriate logos

For my school field day, I have to wear a white shirt and it can have logos or pictures. My shirt has the words "God save england" is that approapriate?

168. ## Math

can any one add or subtact this (m^2 - m - 4) + (m - 5)

169. ## Chemistry

When sodium burns in air it produces a bright white light and heat energy 2Na + O2 2Na2O ?H = -414kJ/mol What would you expect to be the heat energy associated with the reverse process 2Na2O 2Na + O2 Can you please show the entire calculation with units