# Questions Asked onOctober 8, 2013

1. ## Brief Calculus

Minimize F = x2 + y2 with x + 2y = 5 Thank you

2. ## operating system

A database structure can be changed by?

3. ## Algebra 1

A landscape company charges \$100 plus \$15 per hour. Another company charges \$75 plus \$17 per hour. How long is a job that costs the same no matter which company is used?

4. ## english

complete the sentence by writing the correct form of the word shown in parentheses. You may not need to change the form that is given. 1. Is their (dissuade) Ted from attempting that difficult dive. dissuading 2. That statement is absolutely (fallacy).

5. ## Algebra 1

A boat travels 36 miles in 60 minutes. Find the unit rate. Round you answer to the nearest thousandth if necessary.

6. ## Brief Calculus

Last one for today... As the financial consultant to a classic auto dealership, you estimate that the total value (in dollars) of its collection of 1959 Chevrolets and Fords is given by the formula v = 303,000 + 1,020t2 (t ¡Ý 5) where t is the number of

7. ## Chemistry 12

Calculate the mass of K2CRO4 needed to make 3.00 L of a 0.0200 M solution.

8. ## Chemistry 12

The molar solubility of calcium sulphate CaSo4 is 8.43 x 10-3(10 to the power of negative 3) M. Calculate the mass of solid CaSo4 which can be evaporated from 250.0 mL of a saturated solution of CaSO4.

9. ## Chemistry 12

Calculate the volume of 12 M Na2SO3 which needs to be added to 500.0 mL of water in order to produce a solution in which [Na+]= 0.200 M.

10. ## chemistry

Im stuck on these few questions that seems to be getting me no where : -Determine the number of mmoles of HCl that did not react with the anatacid. c HCl = 0.1812 c NaOH = 0.1511 volume of HCl added : 75 volume of NaOH added: 29.23,19.58,33.3 - mmoles of

11. ## Louisiana state history

how did Cajuns, and Creoles influence Louisiana ?

12. ## Chemistry

HCl(aq) +NaOH(aq) ---> NaCl +H2O In a coffee cup calorimeter 50 ml of 2.00M HCl was combined with 50ml of 2.05M NaOH. a) What is the enthalpy change for the reaction? b) What is the molar enthalpy for the reaction? Given: Change in T= 14 degrees celsius

13. ## Computer

How do you solve this algorithm problem? Suppose that you are given a sequence of n elements to sort. The input sequence consists of n/k subsequences, each containing k elements. The elements in a given subsequence are all smaller than the elements in the

14. ## Maths

Given that a and b are real numbers and that x satisfies the inequality ax>=b when x>=14, what is the smallest integer x that satisfies ax>a+2b ?

15. ## Chemistry

10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?

16. ## Chemistry

10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?

17. ## Chemistry

10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?

18. ## chemistry

The band gap of indium gallium arsenide varies based on the concentration of gallium in the material. A sample of InGaAs absorbs light with a wavelength less than 1.37 microns. What is the band gap of the InGaA sample in eV

19. ## chemistry

The band gap of indium gallium arsenide varies based on the concentration of gallium in the material. A sample of InGaAs absorbs light with a wavelength less than 1.37 microns. What is the band gap of the InGaA sample in eV

20. ## Calculus

Find the derivative. s=t^6tan(t)-sqrt t

21. ## Physics

Suppose a rope of mass m hangs between two trees. The ends of the rope are at the same height and they make an angle θ with the trees. (a) What is the tension at the ends of the rope where it is connected to the trees? Express your answer in terms of m,

22. ## U.S. Government and Politics

What were the two main compromises of the Constitutional Convention??? I think they are: the great compromise the three fifth's compromise am i right???

asked by Mary Ann
23. ## Maths

Consider the parabola y=x^2-2px+p+1. If the real number p has the property a

24. ## Algebra

A positive integer minus a positive integer is always positive. This statement is sometimes true. For example, 17 – 5 = 12, but 15 – 20 = –5. post five other statements about the addition and subtraction of positive and negative integers, and ask

asked by Mary Ann
25. ## physics

An archer is preparing to shoot an arrow. He grabs the center of the bowstring and pulls straight back with a force of magnitude F = 173 N. The upper and lower halves of the string form an angle α = 104∘ with respect to each other. Assume that the

26. ## 6th grade math

Hi.. i'm a little confused on using proprtion equations to solve percent problem. can you check the following? Is there a different way to solve? equation: is(part)/of(whatnumber)= %/100 1. What is 94% of 43? x/43 = 94/100 100x = 43*94 (cross multiply)

27. ## chemistry

Im stuck on these few questions that seems to be getting me no where : c HCl = 0.1812 c NaOH = 0.1511 volume of HCl added : 75 volume of NaOH added: 29.23,19.58,33.3 -Determine the number of mmoles of HCl that did not react with the anatacid. - mmoles of

28. ## U.S. Government and Politics

Can anyone help me on this question?? Describe how our Federalist system works in America. /:)

asked by Mary Ann
29. ## Calculus

At a certain factory, output Q is related to inputs u and v by the equation Q= 17u^2+(16u+17v)/(u+v)^2 If the current levels of input are u= 10 and v = 25, use calculus to estimate the change in input v that should be made to offset a decrease of .7 unit

30. ## eglish

1. Is their no (dissuade)Ed from attempting that difficult dive. dissuading 2 Mr. Largen wont accept your paper unless it has adequate (substantiate)substantiatation

31. ## Health

n infection that is congenital is: A. ingested. B. present at the time of birth. C. inhaled. D. transmitted by touch. i think its a or b

32. ## Algebra

What is the x-intercept of -1/2x-5y=-10

33. ## Chemistry

During your experiment, you are drive water from the hydrate M x X y ⋅zH 2 O . You subsequently determine that your hydrate has four molecules of waters associated with each formula unit. However, the bottle the hydrate came from indicated a formula with

34. ## Kharkutta govt. School

Use number line to evaluate the following. (1). -5+(-3) (2). 4-(-4)

asked by S M Gabil
35. ## Physical science

A rock is dropped from a height of 60 m and is in free fall. What is the velocity of the rock as it reaches the ground 3.5 seconds later?

36. ## Algebra II

Help plz..!!! which is the slope of the line with equation 2x + y = 4 2 1/2 -2 -1/2

37. ## algebra

Im lost i don't know how to do this can someone show me step by step how to solve this For what value does c does the equation have one real root? Hint using the values of a and b found in the equation, solve D = 0 for c. Consider the quadratic expression

38. ## biology

5. A researcher finds that blood alcohol levels cause progressive damage to the liver. All the mice in his study were fed the same amount and types of food. Different concentrations of alcohol were injected into each mouse. One group of mice does not

39. ## physics

Suppose a rope of mass m hangs between two trees. The ends of the rope are at the same height and they make an angle θ with the trees. (a) What is the tension at the ends of the rope where it is connected to the trees? Express your answer in terms of m,

40. ## Check my answer plz!!

which shows 3x+6y=-12 in slope-intercept form? option a: y=-1/2x-2 option b: y=-2x-12 option c: y=1/2x-12 option d: y=2x-2 my answer is; a

How is grandmother's dream different from reality? >Last night I dreamed of an old lover I had not seen him in forty years. When I awoke, I saw him on the street. His hair was white, his back was stooped. How could I say hello? He would have puzzled all

42. ## Finance

Consider the following income statement and answer the questions that follow: Sales(100 units) \$200 Variable costs (.80each) 80 Fixed costs 20 EBIT 100 Interest expense 30 EBT 70 Income tax 24 Net income 46 a)what is the firm's Breakeven Point in units?

43. ## Math

Insert parentheses to make the equation true. 14=50-42/3+4*6

44. ## Algebra 1--Please, help me!

Describe the solutions of each inequality in words. 1). -2 < h + 1 2). 5 - x _< 2

45. ## Algebra

Please help me with these alegbra problem! Factoring by grouping by + ay + bx + ax=

asked by Lisa Vice
46. ## Algebra

Factor out the greatest common factor simply the factor if possible. 26(5-x)2-5(5-x)3

asked by Lisa Vice
47. ## Algebra

7m + mn + 35 + 5n=

asked by Lisa Vice
48. ## Science

What could the relative age of two rocks tell you about them? a. One rock is 10,000 years old, and the other is 8,000 years old. b. One rock is older than the other. c. They both have fossils in them. d. One rock is closer to the surface than the other.

49. ## Calculus

Find the derivative. s=t^6tan(t)-sqrt t

50. ## CHEM 101

What volume of a 0.726 M sodium hydroxide solution is required to neutralize 24.6 mL of a 0.298 M hydrobromic acid solution ?

51. ## Statistics

Compute SEdiff Mean1=23 Mean2=18 SD1 =4 SD2 =6 N1 =9 N2 =6

52. ## English

Could you describe to me party animal: behavior, appearance, what he likes, how he dressed. 150 words. Everything can be !

53. ## calcus

int cosxsinx dx

54. ## calcus

int tan^3xsec^3x dx

int sec u du

56. ## Calculus

A street light is at the top of a 17 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 6 ft/sec. How fast is the tip of her shadow moving when she is 50 ft from the base of the pole.

17x-22x=1/2

m/9=m/18+4/2

59. ## Business Statistics

Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits. Calculate the mean of the 20 samples Draw a

60. ## Physics

The density of gold is 19 times that of water. If you take a gold crown weighing 32 N and submerge it in water, how much upward force must you exert on the submerged crown to keep it from accelerating?

61. ## PHYSICS

Suppose a rope of mass m hangs between two trees. The ends of the rope are at the same height and they make an angle θ with the trees. (a) What is the tension at the ends of the rope where it is connected to the trees? Express your answer in terms of m,

62. ## algebra

Im lost i don't know how to do this can someone show me step by step how to solve this For what value of c does the equation have one real root? Hint using the values of a and b found in the equation, solve D = 0 for c. Consider the quadratic expression

63. ## psychology

when wolfgang kohler put tempting bananas out of the reach of the chimpanzees, he found that:

asked by mike/meka harris
64. ## algebra

help me please im confused Consider the quadratic expression X^2 + 4x + c = 0. For what range of values does the equation have two complex roots? what am i doing here can someone show me step by step so i can at least try to do the other problems i have

65. ## Spanish

Lupe, Rosa y Tomás son amigos. (bueno) Is it supposed to be buen or buenos in the empty spot? I know that an adjective is supposed to be shorted before a noun-buen but how about for plural nouns?

66. ## Algebra 1-- Please, help me!

Solve 2x - 3y = 9 for y. Solve 2a + ab = c for a.

67. ## physics

Suppose a rope of mass m hangs between two trees. The ends of the rope are at the same height and they make an angle θ with the trees. (a) What is the tension at the ends of the rope where it is connected to the trees? Express your answer in terms of m,

68. ## Science

What could the relative age of two rocks tell you about them? a. One rock is 10,000 years old, and the other is 8,000 years old. b. One rock is older than the other. c. They both have fossils in them. d. One rock is closer to the surface than the other.

69. ## algebra

find the root i know this answer should be 4 but how do i arrive there can someone show me how to do this please X+16/x=8

70. ## maths

the solution set for the following 1.X3+x2-6x-10=0 2.2x2-4x-4=0 3.x4-x3-4x2+x+1=0

71. ## Psychology

What is the independent and dependent variable in this scenario: A Physiological Psychologist is interested in investigating the effects of a new anti-anxiety drug on maze running behaviour in rats. A pool of rats is divided into two groups. One group of

72. ## Psychology

Indicate the independent variable and dependent variable: A research psychologist, working in a federal prison, is asked to assess the effectiveness of a new life skills program in promoting problem-solving skills. From a pool of 70 inmate volunteers, the

73. ## algebra

how do i solve this find the root 3x^2 +21x=0 is the root 7

74. ## physics

Suppose a rope of mass m hangs between two trees. The ends of the rope are at the same height and they make an angle θ with the trees. (a) What is the tension at the ends of the rope where it is connected to the trees? Express your answer in terms of m,

75. ## physics

A staging that weighs 350 N supports two painters, one 230 N and the other 440 N. The reading in the left scale is Fl = 480 N .What is the reading Fr in the right hand scale? Answer in units of N

76. ## poetry

I have done the questions, just need someone to look them over to see if they make sense and are correct. THANK YOU! Canada Day Love Match My mother stalked her future son in law, convinced he was the one for me. Through the crowd at the Forks Market, she

77. ## chemistry

a compound contains 5.2% by mass Nitrogen. It also contains carbon, hydrogen and oxygen. Combustion of 0.085g of the compound produced 0.224g of carbon dioxide and 0.0372g of water. Calculate the empirical formula of the compound.

78. ## cinquain poem

For social studies we had to make our own 4 topic of cinquain poems. I asked some people and not many knew this type of poem, but one person said it all seem good except for the last lines. Do you think I did the format corret? Thanks for your help

79. ## Spanish

Lupe, Rosa y Tomás son amigos. (bueno) Is it supposed to be buen or buenos in the empty spot? I know that an adjective is supposed to be shorted before a noun-buen but how about for plural nouns?

80. ## physics

A block of mass m1 = 28 kg rests on a wedge of angle θ = 47∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then

81. ## History

Describe a patrician villa

82. ## GEN 105 Personality abd Learning styles

• Describe your strongest dimension on the personality spectrum. • Describe how each practice activity reinforced or contradicted something about yourself

asked by Kala Davis
83. ## English

The knight's shield serves as weapon AND protectant during battle. a. adjective b. verb c. conjunction d. interjection C

84. ## physics

A block of mass m1 = 28 kg rests on a wedge of angle θ = 47∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then

85. ## English

1.Read the following Papago song. Identify the purpose. No talking, no talking. The snow is falling. And the wind seems to be blowing backwards. A. To inform B. To persuade C. To analyze D. To express 2.which of the following statements about early

86. ## chemistry

Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 5.50-g sample is burned, and 1.70 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?

87. ## History

Give me a paragraph on patricians villas from Rome

88. ## Math

(-4,7),(-6,-4)

89. ## Math

Norma borrowed \$1,800 at 11% interest for 90 days. How much interest did she pay on the loan? a. \$49.50 b. \$198 c. \$2 d. \$18.45

90. ## Research

1) What is the relationship of the Mean, Median and Mode as Measures of Central Tendency in a true Normal Curve?

91. ## English

Make a story with these words : climb,explode,sing,bounce,fly,cereal,bouncing castle,bomb,rainbow,hippy,ameriican farmer,superhero,mentally unstable man

92. ## chemistry

Table salt, NaCl(s), and sugar, C12H22O11(s), are accidentally mixed. A 5.50-g sample is burned, and 1.70 g of CO2(g) is produced. What was the mass percentage of the table salt in the mixture?

93. ## English

I need help writing an english essay

94. ## geography

there is an indian person and a european person how do they view the taj mahal

95. ## Chemistry

PLEASE HELP. If I have 0.10 mL of 200 mcg/mL protein, 0.90 mL of distilled water, and 2.00 mL of Bradford reagent, what is the concentration of the protein?

96. ## Physics

A 23.9kg box rests on a table. A 16 kg box is placed on top of the first box, as shown. determine the total in N that the table exerts on the first box.

97. ## physics

Forces of 9.93 N and 1.23 N act at right angles on a reddish-green block of mass 3.02 kg. How much acceleration occurs?

asked by i need help
98. ## physics

Forces of 8.85 N and 2.21 N act at right angles on a stack. What is the mass of the stack if it accelerates at a rate of 4.4 m/s^2?

asked by i need help
99. ## physics

What would be the resultant vector with an angle of 30° with the +x axis and has a y component of 8.9 Newtons?

asked by i need help
100. ## physics

What would be the resultant vector with an angle of 30° with the +x axis and has a y component of 8.9 Newtons?

asked by i need help
101. ## Science

What could the relative age of two rocks tell you about them? a. One rock is 10,000 years old, and the other is 8,000 years old. b. One rock is older than the other. c. They both have fossils in them. d. One rock is closer to the surface than the other.

102. ## Algebra

If 3t – 7 = 5t, then 6t =

103. ## Chemistry

Microwave ovens emit microwave energy with a wavelength of 13.0 cm. What is the energy of exactly one photon of this microwave radiation?

104. ## earth science

How is the decaying of radioactive uranium into lead used to date rock?

105. ## earth science

what element was in the ocean and what color was the water

106. ## physics

A block of mass m1 = 28 kg rests on a wedge of angle θ = 47∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then

107. ## Physics

In uniform circular motion, which of the following quantities are constant: speed, instantaneous velocity, tangential velocity, radial acceleration, tangential acceleration? Which of these quantities are zero throughout the motion?

108. ## Accounting

What is 20% of \$80,000

asked by Willard Norman
109. ## English

Please help me which one is coreect in grammar and please explain me. 1.She was moving to singapore on June 2012 for job opportunity. 2. She has moved to singapore on june 2012 for job opportunity.

110. ## English

Mark or cut slightly _ _ _ atch Large irregular spot or stain _ _ otch

111. ## physics

A block of mass m1 = 28 kg rests on a wedge of angle θ = 47∘ which is itself attached to a table (the wedge does not move in this problem). An inextensible string is attached to m1, passes over a frictionless pulley at the top of the wedge, and is then

112. ## Physics

A skateboarder, with an initial speed of 2.6m/s , rolls virtually friction free down a straight incline of length 18m in 3.3 s. What angle is the incline plane?

in the MLK jr i have a dream speech the anophora "one hundred years later" how does the rhetorical device help to strengthen or advance this argument. how does King’s use of anaphora strengthen and advance this argument. Think about: The time period of

114. ## Math

Using continuous compounding. A 13,000 deposit in an account with APR of 4.5 percent is. The balance in the account after 1 year is what.

115. ## social studies (history)

In what ways did the movement of people and technology into and within the Great Plains effect the United States and its residents?

116. ## English

What is the title for the student who is a representative of all the students in school? is it school president or student president? Would you let me know about that? Thank you.

117. ## History

1) Give a short explanation about mining industry in the 1800s and the effect it had. 2) give a short explanation about Transcontinental railroad construction in the 1800s and the effect it had. 3) give a short explanation about Transcontinental railroad

118. ## Ela

What are 2 things that make the zoom sound ,meow sound ,and ding dong sound ?

119. ## Science

A stone with a mass of 225.0g is placed into a graduated cylinder with a starting volume of 200.0ml. If the water in the cylinder is displaced to 225.0 ml, calculate the volume of the rock and its density.

120. ## English

1. The reason why I like it is I can enjoy tasting many ingredients. 2. The reason why I like it is that I can enjoy tasting many ingredients. 3. The reason why I like it is because I can enjoy tasting many ingredients. (Which one is grammatical? Which one

121. ## History

1) Give a short explanation about mining industry in the 1800s and give and effect it had. 2) Give a short explanation about Homestead act exodusters in the 1800s and give an effect it had. 3) Give a short explanation about cattle drives/beef industry in

122. ## Math

It takes the planet Neptune about 164.8 years to revolve once around the sun. What are the least and greatest numbers written in hundreths that could round to 164.8? Explain your answer.

123. ## 7th grade Math

Please, help me how to solve this problem 21% of 82 how do you use a fraction to estimate the percent of each number? Thank you

124. ## Science

The dimensions of an object are 3.5 cm, 3.5 cm, and 2.9 cm. Its mass is 6.0g. Calculate the volume and density of the object. Will it float or sink? Please help me with my other question too. Thank you !!!

125. ## maths

solve the equation log3 (2-3x) = log9 (6x^2-19x+2)

126. ## maths

sketch the equation of the asymptote y=0 or e^(3x)=0

127. ## English

1. They are having an election for school president. 2. They are having an election for the school president. 3. They are having an election for a school president. (Which one is grammatical and commonly used?)

128. ## maths

sketch the graph of inx/x

129. ## grammar

What is the complete subject if the following sentenc:some people like to take classes to learn new things

130. ## Math

5(2a + b)-2(3a-5b) Is the answer 4a+15b just checking

131. ## Science

Assume the speed of a nerve impulse is 100 m/s. How does this compare to the speed of electricity in a copper wire (approximately 3.00*10^8 m/s)? What does this tell you about the flow of electrons in a wire compared to the movement of ions in a membrane?

132. ## math

1. 4+(-7) 2. 0+(-6) 3. -2+8 4.6+(-6) 5. -8+(-7).

133. ## math

This year, the sum of Mr. Bellini's age and his son's age is 38 years. 4 years ago, Mr. Bellini's was 5 times as old as his son. How old is his son this year? How old is Mr. Bellini this year?

134. ## organic chemistry

1if you open the tert-butyl chloride and tert-butyl bromide to the air for few hours? What happened to the ratio of the halide mixture during this time? (2-methyl-2-propanol reaction )

135. ## math

A rectangular plot of land is to be seeded with grass if the plot is 22m X 28m and a 1kg bag of seed is needed for 85m^ of land how many bags of seeds are needed?

136. ## Math

How are the factors of 36 related to the factors of 72?

137. ## Physics

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 94 kg. The mass of the rock is 0.27 kg. Initially the wagon is rolling forward at a speed

138. ## combination,Math

Navid took a trip to the store to purchase some balls. His choices at the store were green,blue,white and red balls. If Navid purchased 9 balls, how many different combinations of balls could he have purchased?

asked by Ball Counting
139. ## Human and Social Biology

Describe how social biologist may help to solve the the problems of lack of houses a nd problem ooof sanitation

140. ## algebra

how many times can you make a perimeter of 10?

141. ## Calculus

Differentiate y=log(8x^2-3x+9)

142. ## Calculus

Find dy/dt. y=cos^4(pi(t)-20) If you could please show step-by-step, it would be much appreciated. Thanks in advance!

143. ## social studies

What patterns do you see in the rise and the fall of many civilization in the Fertile Crescent?

mx + nx = p

145. ## Calculus

Given a power function of the form f(x)=ax^n, with f'(3) = 14 and f'(6) = 28, find n and a.

146. ## (ENGLISH) please check over english work.

I have finished all of the questions, just need someone to look over them. I have posted these questions before, but someone told me to re-do them and I decided to post them again. Canada Day Love Match My mother stalked her future son in law, convinced he

147. ## Language

Make a simile of pablo sniffed the air.

148. ## chemistry

The band gap of indium gallium arsenide varies based on the concentration of gallium in the material. A sample of InGaAs absorbs light with a wavelength less than 1.37 microns. What is the band gap of the InGaAs sample in eV

149. ## French

I need a poem about sunsets with metaphors... I need help!

150. ## arithmetic

How do you solve this for h? A=1/2(b1 plus b2)?

151. ## Science~

Please! Please! Please help me really quick! Pleae check my answers! 1. A population of oak trees growing in a region in Canada experiences a change in climate to much colder temperatures and much drier conditions than they have had for many decades. What

152. ## Physics

A 92 kg disk, with a radius of 0.97 meters, is rotating at 562 rpm. What is its angular momentum, to the nearest tenth of a Joule*sec?

153. ## Calculus

Differentiate y=log(8x^2-3x+9)

154. ## Physics

The lower frequency limit for human hearing is usually considered to be 20.0 Hz. (a) What is the speed of sound in m/s if the air temperature is 20.0ºC? (b) What is the corresponding wavelength for this frequency?

155. ## math-probability

Employees at a company are given a three digit employee identification code. If each digit cannot be repeated, how many different codes are possible? Please help.

156. ## physcis

how can i graph this scenario a hawk flies north 5 miles in 5 min. it turns around and flies south 3 miles in 3 min, then turns back around and flies north 2 miles in 2 min.

157. ## Calculus

A baseball diamond is a square with sides of length 90 ft. A batter hits the ball and runs toward first base with a speed of 21 ft/s. At what rate is his distance from second base changing when he is halfway to first base? At what rate is his distance from

158. ## Calculus

Find the slope of the tangent line to the curve (a lemniscate) 2(x^2+y^2)^2 = 25(x^2-y^2) at point (-3,-1).

159. ## Calculus

The top of a 24 foot ladder, leaning against a vertical wall, is slipping down the wall at the rate of 4 feet per second. How fast is the bottom of the ladder sliding along the ground when the bottom of the ladder is 7 feet away from the base of the wall?

160. ## psychics

The lower frequency limit for human hearing is usually considered to be 20.0 Hz. (a) What is the speed of sound in m/s if the air temperature is 20.0ºC? (b) What is the corresponding wavelength for this frequency?

161. ## Calculus

At noon, ship A is 150 km west of ship B. Ship A is sailing east at 35 km/h, and ship B is sailing north at 25 km/h. How fast is the distance between the ships changing at 4:00 P.M.?

162. ## math

58, ____, ____, ____, ____, -2

163. ## algebra

a poll was taken of 100 students at a computer campus to find out how they got to campus. 31 said they drove alone 34 rode in a carpool 25 rode public transportation 5 used both carpool and public transportation 8 used both a car pool and sometimes their

164. ## Pre-Calculus

You are given a pair of equations, one representing a supply curve and the other representing a demand curve, where p is the unit price for x items. 466p+90x−2390=0 and 484p−22x−978=0 Determine the revenue function. Revenue function R(x)=? I got

165. ## 6th grade math

A bag of fetilizer that weighs 18 3/4 pounds can cover 5000 sq feet. how many pounds of fetilizer will be needed to cover 27,000 square feet? how many bags of fertilizer are needed? explain how you found your answer

166. ## math

This year, the sum of Mr. Bellini's age and his son's age is 38 years. 4 years ago, Mr. Bellini was 5 times as old as his son. How old is his son this year? How old is Mr. Bellini this year?

167. ## 6th grade math

Can you check these percent proportion problems? 1. 50 students got pizza at lunch. 20% of those got chocolate milk. How many students got chocolate milk? 50/n = 20/100 20n = 100*50 20n = 5000 n = 5000/20 n = 250 students 2. Mr. Ford has 45 fish in his

168. ## Physics

Moving in the x-direction, a particle carrying 1.0uC experiences no force. Moving with speed v at 30 degrees to the x-axis, the particle experiences a force of 2.0 N. What is the magnitude of the force it would experience if it moved along the y-axis with

169. ## 6th grade math

how many 3 3/4 inch wires can be cut from a spool of wire that is 100 inches long will there be any wire left over? if so how much?

170. ## American History

Why did the 21 amendment repeal the 18 amendment?

171. ## Social studies

Was Robespierre a hero or villain? What were some of the things he did (good and bad). Im writing a multi- paragraph essay and I don't really get who he is and what he did. (Ms. Sue;)