1. chemistry

Iron(II) can be oxidized by an acidic K2Cr2O7 solution according to the net ionic equation. Cr2O72− + 6 Fe2+ + 14 H+ 2 Cr3+ + 6 Fe3+ + 7 H2O If it takes 44.0 mL of 0.0250 M K2Cr2O7 to titrate 25.0 mL of a solution containing Fe2+, what is the molar

2. precalculus

Twenty percent of a radioactive substance decays in ten years. By what percent does the substance decay each year?

3. math

why is it good to have holes in your t-shirts?

4. Physic

Three balls are attached to a light rigid rod, as shown in the figure. A fulcrum is located at xf = 18.0 cm measured from the left end of the rod. Ball A has mass mA = 65 g and is located at xA = 3 cm. Ball B has mass mB = 12 g located at xB = 22 cm. Ball

5. physics

a simple pendulum consists of a bob of mass 1.8 kg attached to a string of length 2.3 m. the pendulum is held at an angle of 30 from the vertical by a light horizontal string attached to a wall, as shown above. calculate the tension in the horizontal

6. Chemistry

If i titrated 25.0mL of 0.500M HCl with 0.500M NaOH and then 25.0mL of 0.500M of an unknown weak acid HA with 0.500M NaOH. How would the two titration curves compare at 10 or 15mL of NaOH Beyond equivelance pts? I think that they will be the ssame or

7. Physics

A mechanic jacks up the front of a car to an angle of 6.2° with the horizontal in order to change the front tires. The car is 2.91 m long and has a mass of 1100 kg. Gravitational force acts at the center of mass, which is located 1.02 m from the front

8. m ath

Compute f '(a) algebraically for the given value of a. HINT [See Example 1.] f(x) = −6x − x2; a = 4

the purchasing power (in dollars) of an annual amount of A dollars after t years of 5% inflation decays according to P= Ae^-0.05t a) how long will it be before a pension of \$60,000 per year has a purchasing power of \$30,000 b) how much pension A would be

10. ENGL

These three questions I am having difficulty in solving. Can you help me here. Question 1 - a) Whenever children in the United States turn on the tv, B) they are more likely to encounter violence on the screen. A is an independent clause. A is a dependent

11. chemistry

rank the following ionic compounds in order of increasing lattice energy NaF, Csl, CaO

12. physics

About 50,000 years ago, in an area located outside Flagstaff, Arizona, a giant 4.5x10^7 kg meteor fell and struck Earth, leaving a 180 m hole now known as Barrington crater. If the meteor was traveling 20000 m/s upon impact, with what average force did the

13. Statistics

Suppose x is a uniform random variable with c = 40 and d = 50. Find the probability that a randomly selected observation exceeds 46

14. physics

A 9.00 kg object starting from rest falls through a viscous medium and experiences a resistive force = -b , where is the velocity of the object. The object reaches one half its terminal speed in 5.54 s. (a) Determine the terminal speed. (b) At what time is

15. math

Hitomi has a total of 30 red and blue bowling balls at her bowling alley. Each red ball weighs 8 lb. Each blue ball weighs 9 lb. If the total mass of the blue balls is 49 lb. heavier than the total mass of the red balls, how many red balls does she have?

16. physics

A child swinging on a swing set hears the sound of a whistle that is being blown directly in front of her. At the bottom of her swing when she is moving toward the whistle, she hears the higher pitch, and at the bottom of her swing, when she is moving away

17. precalculus

The earth's atmospheric pressure, P, in terms of height above sea level is often modeled by an exponential decay function. The pressure at sea level is 1013 millibars and the pressure decreases by 14% for every kilometer above sea level. (a) What is the

18. geometry

A wire is attached to the top of a flag pole. The wire meets the ground 4 meters from the flag pole. The wire makes a 45 degree angle with the flag pole. How tall is the flag pole?

19. Physics

Two crewmen pull a raft through a lock, as shown in the figure . One crewman pulls with a force of 130 at an angle of 34° relative to the forward direction of the raft. The second crewman, on the opposite side of the lock, pulls at an angle of 45°. With

20. physics

An electric space heater draws 15.5 A from a 120 V source. It is operated, on the average, for 5.0 h each day. How much energy in kWh does in consume in 30 days? At 11 per kWh, how much does it cost to operate the heater for 30 days?

21. physics

Two positive charges of 5.43 µC each are 508 cm apart. Find the electric ﬁeld midway between them. What is the magnitude of the electric ﬁeld if one charge is positive and the other negative, both of magnitude 5.43 µC?

22. precalculus

An investment decreases by 4% per year for 3 years. By what total percent does it decrease after the 3 years?

23. Physics

A parallel-plate capacitor is made from two plates 12.0cm on each side and 4.50mm apart. Half of the space between these plates contains only air, but the other half is filled with Plexiglas of dielectric constant 3.40. An 18.0 V battery is connected

24. Finance

You have found the following stock quote for RJW Enterprises, Inc., in the financial pages of today's newspaper. The closing price for this stock that appeared in yesterday's paper was \$????. If the company currently has 17 million shares of stock

25. physics

A string of 26 identical Christmas tree lights are connected in series to a 120 V source. The string dissipates 63 W. What is the equivalent resistance of the light string? Answer in units of Ω.

26. physics

A string of 26 identical Christmas tree lights are connected in series to a 120 V source. The string dissipates 63 W. What is the equivalent resistance of the light string? Answer in units of Ω.

27. physics

Two loudspeakers are 2.54 m apart. A person stands 3.04 m from one speaker and 3.50 m from the other. What is the lowest frequency at which destructive interference (sound cancellation) will occur at this point?

28. Physics

Your stereo is set to a sound intensity level (SIL) of 60 dB. I'd like to know what this means in terms of energy flow: what is the intensity of the sound wave this produces? Compute your answer in W/m2, but do not enter units. So in my problem it would be

29. Biochemistry

Describe the full preparation of 1.0L 0.2mol/L pH 4.4 acetate buffer. (pka=4.76, Mr Na acetate 82, glacial acetic acid is 17.4mol/L)

30. geomerty

the measure of an interior angle is 60 degrees less than 11 times the measure of an exterior angle find the value of the interior angle

31. physics

Two positive charges of 5.43 µC each are 508 cm apart. Find the electric ﬁeld midway between them. What is the magnitude of the electric ﬁeld if one charge is positive and the other negative, both of magnitude 5.43 µC?

An astronaut is performing a space walk outside the International Space Station. The total mass of astronaut with her space suit and all lher gear is 127 kg. A small leak develps in her pulsion system and 5.84 g of gas are ejected each second into space

33. physics

water has a specific heat of 4184 j(kg K). How much energy is needed to increase the temperature of a kilogram of water 5 degrees celcius?

34. HiSTORY ....helpppppp

Which of the following statements about the U.S. annexation of Hawaii is true? A. It was universally popular in the United States. B. The U.S. went to war with European powers to obtain the islands. C. It made both military and economic expansion in the

35. physics

Calculate the value of g for a satellite that is orbiting in a circle at an altitude equal to 3 Earth radii. also, along the same lines, A typical shuttle altitude is 220 km. Calculate the value of g at this altitude. The the mass of the Earth = 5.98 x

36. Chemistry

A 1.50mol sample of helium at a certain temperature and pressure has a volume of 31.4L. A second sample of helium at the same temp and pressure has a volume of 42.2L. How many moles of Helium are in the second sample?

37. ACCOUNTING

Department A had 10,000 units in work in process that were 30% converted at the beginning of the period at a cost of \$10,000. During the period, 15,000 units of direct materials were added at a cost of \$60,000, 16,000 units were completed, and 9,000 units

38. physics

Two positive charges of 5.43 µC each are 508 cm apart. Find the electric ﬁeld midway between them. What is the magnitude of the electric ﬁeld if one charge is positive and the other negative, both of magnitude 5.43 µC?

39. chemistry

A quantity of 12.75 mL of a KOH solution is needed to neutralize 0.5109 g of KHP. What is the concentration (in molarity) of the KOH solution?

40. math

The function gives the cost to manufacture x items. C(x) = 20,000 + 5x − x2 20,000 ; x = 20,000 Find the average cost per unit of manufacturing h more items (i.e., the average rate of change of the total cost) at a production level of x, where x is as

41. Math

particles of mass 3m and 5 m hang one at each end of a light inextensible string which passes over a pulley.The system is released from rest with the hanging parts taunt and vertical.During the subsequent motion the resultant force exerted by the string on

42. calculus

a company maufacturing surfboards has fixed costs of \$300 per day and total costs of \$5100 per day for a daily output of 20 boards. Assume the total cost per day C(x) is linearly related to the total output per day x. write an equation for the cost

43. deritives

Compute the indicated derivative. R(t) = −0.8t2; R'(7)

44. Organic Chemistry

What is the major product from the sulfuric acid and Hg(II)-catalyzed hydration ethynylcyclohexane?

45. Economics

What north Korean demand almost led to the failure of the most recent round of talks?

An astronaut is performing a space walk outside the International Space Station. The total mass of astronaut with her space suit and all lher gear is 127 kg. A small leak develps in her pulsion system and 5.84 g of gas are ejected each second into space

47. physics

2. Two equally charged balls, each of mass 0.10 gm, are suspended from the same point by threads 13 cm long. The balls come to rest 10 cm apart due to electrostatic repulsion. Determine the charge on each ball.

48. Math

How many distinct permutations of the letters of the word OTTAWA being and end with the letter T? I did 6!/2! :S but i get 360. I tried 6P2=30 I am getting it wrong... help please.

49. Chemistry

For the balanced equation shown below, if 40.1 grams of C2H3O2Br were reacted with 8.01 grams of O2, how many grams of H2O would be produced? 2C2H3O2Br+O2->4CO+2H2O+2HBr Thank you!

50. physics

What forces are acting on a puck that is on an air hockey table?

51. Geometry/trig

How do I find the geometric mean between 12 and 2.4?

52. English

Is "brittle" an onomatopoeia?

53. Physics

On a cold winter morning, a child sits on a sled resting on smooth ice. When the 9.20 kg sled is pulled with a horizontal force of 40.0 N, it begins to move with an acceleration of 2.50 m/s^2. The 23.0 kg child accelerates too, but with a smaller

54. Chemistry

how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?

55. math

Find the lateral area for the prism. what formula do i us for this?

56. geography

two states that are located in the northeast tip of the Southeast region of the united state.

57. physics

2. Two equally charged balls, each of mass 0.10 gm, are suspended from the same point by threads 13 cm long. The balls come to rest 10 cm apart due to electrostatic repulsion. Determine the charge on each ball.

58. trigonometry (please double check this)

Solve the following trig equations. give all the positive values of the angle between 0 degrees and 360 degrees that will satisfy each. give any approximate value to the nearest minute only. a.) ( I got confused doing this 1 can you help me with it.) 3 sin

59. math

Compute f '(a) algebraically for the given value of a. HINT [See Example 1.] f(x) = −2x + 2; a = −5

60. Chemistry - NO2 Calculation

(a) Calculate [NO2] at each time interval, based on [O2]. Assume initial [NO2] = 0.0 mol/L. how do i calculate NO2 at this time intercal so when t= 600s O2 in mol/l = 0.0021

61. Trigonometry

use the appropriate trig identity (sum and difference, half angle, double angle) to find the exact value. 1)cos 255 degrees 2) sin 165 degrees 3) tan 285 degrees

62. physics

Your car is broken, so you’re pushing it. If your car has a mass of 868 kg, how much momentum does it have when it’s moving forward at 4.74 m/s (17.1 km/h)?

63. Chemistry

CaCO3(s) CaO(s) + CO2 (g) A 5.9-gram sample of CaCO3 (molar mass = 100.) is placed in an evacuated 2.00L container and heated to 200^oC. Equilibrium is reached when 5.15% of the CaCO3 has decomposed. 1)Write the Kp expression for this reaction and

64. Civics

Is Aristocarzy limited or unlimited government

65. Chemistry

I have a simple question: why does mgcl2 have a higher boiling point than ncl3?? I thought mgcl2 in terms of intermolecular forces had just dispersions and because ncl3 had dispersions and dipole dipole ( cause it's polar) had a higher IMF therefore a

66. algebra

a photograph now measures 33cm wide by 45 cm long. before it was enlarge its width was 11cm what equation represents this proportion

67. Physics

A capacitor network has two capacitors in series: 150nF and 120nF. The potential difference between point a on the outer side of the 150nF capacitor and point b on the outer side of the 120nF capacitor is 120nF. a) total charge of the network= 2.4uC b)

68. physics

Two blocks, A and B (with mass 50 kg and 100 kg, respectively), are connected by a string, as shown in Figure P5.64. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is µk = 0.25.

69. PHYSICS tension & angle

A van accelerates down a hill (Fig. P4.71), going from rest to 30.0 m/s in 6.70 s. During the acceleration, a toy (m = 0.250 kg) hangs by a string from the van's ceiling. The acceleration is such that the string remains perpendicular to the ceiling. Find

70. Hydrogen bonding with polypeptides

In a polypeptide at physiologic pH, hydrogen bonding may form between which of the following? a) side chains of leucine residue and lysine residue b) side chains of aspartyl residue and glutamyl residue c) terminal amino acid group and terminal carboxyl

71. statistics

Let X be a continuous random variable that is normally distributed with mean, µ = 15 and standard deviation, σ = 2.8, find a value xo that represents the 80th percentile of the distribution.

72. math

A recipe that makes 18 cookies calls for 3/4 cup of sugar. How much sugar is needed to make 24 cookies using this recipe?

73. math

Use the Generalized PMI to prove: 2^n > n^2, for all n > 4 First of all, it's true for n=5. Then to prove it for n+1... Assume 2^n > n^2. Then 2^(n+1) = 2*2^n > 2*n^2 > 2*(4n) since n>4 => n^2>4n I'm stuck there.

74. physics

The length of the auditory canal in humans averages about 2.5 cm. What is the second lowest standing wave frequency for a pipe of this length open at one end? Use 345 m/s for the speed of sound. I know that 4L=lambda, so lambda= 10cm. I know that

75. physics

String instrument players can tune one string off of another - once you are happy with the tension and resulting pitch in one lower string, you put your finger down partway up the first string at the appropriate spot to make a higher pitch, one which

76. Science

what does DNA stand for? What is a gene? Where in the cell are chromosomes located? what two scientists established the structure of DNA? DNA is sometimes descrived as twisted ladder. What is this shape called? What forms the backbone of DNA? What forms

77. physics

What is the magnitude of the electric ﬁeld if one charge is positive and the other negative, both of magnitude 5.43 µC?

78. chemistry

How do you find the mass of a solution if you have 1L of 2.5 M MgCl2. I have determined how many moles are present in MgCl2 which was 2.5 and how grams are present which came out to be 238.025g Now I'm asked "What is the mass of the solution and the mass

79. chem

which compound will dissolve better in water, NaCl or CsCl...explain!!! *hint* check eletronegativity!

80. trigonometry

if the three sides of a triangle is 4,5,6 then the cosine of the angle between the sides 4 and 5 is

81. geometry

The medians of a right triangle which are drawn from the vertices of the acute angle are 5 and root 40. What is the length of the hypotenuse? Can someone show me how to do it? thanks

82. trigonometry (please double check this)

Solve the following trig equations. give all the positive values of the angle between 0 degrees and 360 degrees that will satisfy each. give any approximate value to the nearest minute only. 1. sin2ƒÆ = (sqrt 3)/2 2. sin^2ƒÆ = cos^2ƒÆ + 1/2 3. sin 2x

what is a metaphor using a time you were tired?

84. physics

If the rotational speed of each wheel is 9 revolution per second, what are the tangential speeds of a point on the rim of each wheel? Note: Wheels spin independently with equal rotation speeds -Diameter of Wheel A: 24 -Diameter of Wheel B: 12

85. Social Psychology

How does self-handicapping differ from defense mechanisms?

86. Chemistry

For the balanced equation shown below, if 40.1 grams of C2H3O2Br were reacted with 8.01 grams of O2, how many grams of H2O would be produced? 2C2H3O2Br+O2->4CO+2H2O+2HBr Thank you!

87. algebra

The base of a triangle is 8 cm greater than the height. The area is 64 cm^2. Find the height and the length of the base.

88. physics

010 (part 1 of 5) 10.0 points A string of 26 identical Christmas tree lights are connected in series to a 120 V source. The string dissipates 63 W. What is the equivalent resistance of the light string? Answer in units of Ω. 011 (part 2 of 5) 10.0 points

89. Pre Algebra

What are the length and width of a rectangular dog pen with a perimeter of 38 feet where the length is 2 feet less than twice the width? Write and solve a multi-step equation for the problem.

90. Trigonometry

Write equivalent equations in the form of inverse functions for a.)x=y+cos è b.)cosy=x^2 (can you show how you would solve) a.) x= y+ cos è cos è = x-y theta = cos^-1(x-y) b.) cosy=x^2 cos(y) = x^2 y = Cos^-1(x^2)

91. physics

Suppose a sound of frequency 1200 Hz is emitted from a speaker 15 meters away from you. At YOUR location, the intensity is 1.0E-7 W/m2. Let me assume your eardrum has area 8E-5 m2. If the sound continues for 20 seconds, what total amount of energy is

92. ECONOMICS

WHAT DO GOVERNMENT STATISTCIANS CALCULATE GDP BY SIMPLY ADDING UP TOTAL SALES OFALL BUSINESSFIRMS IN ONE YEAR?

93. math

Solve the simultaneous equations (x +3)(y+ 5)=24 (y +5)(z-7)=48 (z+ 7)(x+ 3)=32

94. physics

Planets A and B orbit the same star. Planet B is four times further from the star than planet A and has twice the mass of planet A. The gravitational force of the star on planet B is ____ the force on planet A.

95. chemistry - decomposition of water(help)

Hydrogen is a very appealing fuel, in part because burning it produces only non-polluting water. One of the challenges that researchers face in making hydrogen fuel a reality is how to produce hydrogen economically. Researchers are investigating methods of

96. math-pre algebra

what is 4a-7=4(a-2)+1?

97. chemistry - decomposition of water(help)

Hydrogen is a very appealing fuel, in part because burning it produces only non-polluting water. One of the challenges that researchers face in making hydrogen fuel a reality is how to produce hydrogen economically. Researchers are investigating methods of

98. physics

There is a weight on a table, connected by a cord to another weight hanging over a pulley, as shown in the diagram below. The coefficient of kinetic friction for the weight on the table is 0:25. How fast does the hanging weight accelerate? Top weight is 12

99. science

what is a good haiku poem about sodium??

100. Physics

Make an analogy between heat capacity and density. Describe which quantities correspond to one another. Thanks!

101. physics

A proton moves at right angles to a magnetic ﬁeld of 0.0609 T with a speed of 8.16×10 6 m/s. Find the magnitude of the acceleration of the proton. Answer in units of m/s 2

102. physics

The magnetic ﬁeld in a loudspeaker is 0.2 T. The wire consists of 308 turns wound on a 4.12 cm diameter cylindrical form. The resistance of the wire is 8.2 Ω. Find the force exerted on the wire when 15.8 V is placed across the wire. Answer in units of N

I need help with this problem ! 5 2/5 - 3 4/5= ? 6 1/10 - 3 4/10 = 10 - 4 2/5= ? PLEASE! SHOW ME EACH PROBLEM STEP BY STEP SO , I CAN FINISH MY HOMEWORK! THANK YOU!

104. interview question

The letter which best completes the sequence below is: A D E H I ? Answer: J. K. L. M. N.

105. chem

Calculate the freezing point and boiling point of a solution that contains 57.0 g NaCl and 53.4 g KBr dissolved in 750.3 mL H2O

106. Math

Luis needs to mMs. Large circular clock that measures anout 6 ft in circumference. Which equation can use the use to find r, the radius of the clock? A. R= 6/pie B. R=12/pie C. R=6/2pie D. R= 12/2pie

107. physics

If you sit in a good swivel chair with your feet off the floor, the chair will turn slightly as you move about but will immediately stop moving when you do. Why can’t you make the chair spin without touching something?

108. math

solve for x by writing the equation in exponential form: log sub 4 x=-2 log sub 5 (2x + 1)=2

109. general chemistry.

The nutritional calorie (Calorie) is equivalent to 1 kcal. One pound of body fat is equivalent to about 4.1 103 Calories. If an athlete expends 1635 kJ/h, how long does she have to play to work off 1.0 lb of body fat?

The following pattern continues indefinitely. REPEATREPEATREPEAT… 1) What is the 38th letter in the pattern? Explain your answer. 2) What is the 40th letter in the pattern? Explain your answer. 3) What is the 604th letter in the pattern? Explain your

111. Chem- PLZ HELP!

Consider 100g of 5.5% (mass) solution of NaNO3. Complete the following table, before calculating molarity, molality and mole fraction of NaNO3. Solute(NaNO3)|Solvent(H2O|Soln Mass(g) 100g Moles ---- RefInfo 85g/mol 18.02g/mol Density=1.00g/mol (This goes

112. college physics

If a rope with linear mass density .167kg/m and is 4m long, what are the lowest four frequencies of standing waves possible on such a rope? What is the fundamental frequency?

113. Chemistry

# moles of Ca3(PO4)2 produced from 3100g Ca3(PO4)2

114. math

2x + 4=4y + 4 Find the value of x.

115. Chemistry

Change 50.0 ml at standard conditions to 43 degrees celsius and 750mmHg

116. physics

A bullet is shot straight upwards .It takes 18 seconds to reach the highest point in its trajectory.what was bullet maximum speed?

117. math

Compute f '(a) algebraically for the given value of a f(x) = x3 + 8x; a = 7

118. biology

If you inject carbon nanotubes into the body, can we produce antibodies against it? some ideas: - my answer is yes and no... the carbon nanotubes are too large for the t-cell to destroy it; therefore, they won't have an affect. -plus our whole body is made

119. Math

Find the exact number of cubes measuring 3 Cm. on an edge that will fill a box shaped like a rectangular prism that measure 24 cm by 18 cm by 9 cm

120. physics

a 150 lb skydiver is falling in a head first position at a terminal (constant) velocity of 120 mi/h find the force in pounds of the skydiver

121. math

Rail earns 10% commission on each guitar and 15% commission on each keyboard he sells. In two week he sold 5 guitars that cost\$260 each and 2 keyboards that costv\$420 each. How much commission did he earn on these seven items?

122. Diversity and Culture

Do you believe that it is difficult to measure prejudice

123. Chem

Can u guys check my answer?? Question: convert 24 grams of ice at -10 degrees Celsius to water at 45 degrees Celsius. I got q= 13022 joules Is that correct?

125. math

f(x) = 7 ln x; estimate f '(4)

126. Math

A 20-foot telephone pole casts a 4-foot shadow. what shadow length will the 6-foot man cast ? A) 1.2feet B) 2.1feet C) 2.2feet

127. math

simplify each expression by using properties of logarithms or definitions. check your results using the change of base formula a.) log3 27= b.) log5 (1/5)= c.) if f(x)= ln (x), find f(e^x)

128. calc

Compute the indicated derivative. q(p) = 2.5 p + 3.2; q'(5) 1

129. world history

During the eighth century C.E., many of the rulers of Japan were A. women. B. commoners. C. from the merchant class. D. military strongmen

130. Chemistry

how do you know which names end in ide, ite, and ate?

131. Chemistry

how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?

what is a simile using a neighborhood cat?

133. Algebra

If I buy 2 apples and 6 oranges, I will spend \$5.60. However, if I buy 6 apples and 2 oranges, I will spend \$4.80. How much does one orange cost? Write the answer like this example: 48cents.

134. Trigonometry

Solve the following trig equations. Give all positive values of the angle between 0 degrees and 360 degrees that will satisfy each. Give any approximate value to the nearest minute only. 3 sin è - 4 cos è = 2 Can you please help me with this one.

135. Interview question

You are going to make a box out of cardboard. The box needs to measure 10 cm by 5 cm by 5 cm; 10% of the final product will be wasted in the cutting process. How much cardboard do you need? Multiple choice answers are: 125 cm. 140 cm. 200 cm. 250 cm. 275

136. Math

find the gcf and lcm of 10, 60, and 32 and show work

137. math

georgia is constructing a line perpendicular to xz at point x.with x as a center,she drew two arcs that intersect xz at points w and y.what is the next step she should take? a.set the compass wider and use points w and y as centers to draw arcs that

138. geometry

The area of ETG is 400 square meters. To the nearest tenth of a meter , what is the length of side EG?

139. physics

There is a weight on a table, connected by a cord to another weight hanging over a pulley, as shown in the diagram below. The coefficient of kinetic friction for the weight on the table is 0:25. How fast does the hanging weight accelerate?

140. college algebra

Solve: sq root of (x+1) minus 3 = sq root of (x+4) when I solve it I get zero, but when I plug it back in only one answer works. do both have to work for it to have a solution?

141. Math

I want to make a fence with a perimeter of 42 feet and an Area of 58 square feet. Label all sides of the fence.

142. college prep math

what is the least common denominator of (x-4/5x^2-14x-3)-(2x/10x^2-3x-1)+(7x-2/2x^2-7x+3)

143. Geology maps

An environmental restoration project requires that you enlarge part of the map to a scale of 1 inch to 1000 feet. Calculate the factor by which it needs to be enlarged.

144. math

A circular room has radius equal to 40 feet. Marble is to be laid on a sector of the room. What is the area of the sector if the central angle is 45°?

145. Pre-Algebra: Help

I have to do a webquest for pre-algebra and we have to make up a fundraiser thing, I need a list of things that one needs for a charity fundraiser, such as chairs, buffet tables, tables, tents, tablecloths. HELPP

146. Algebra I

Factor 9b2 - 4.

147. Math

Express the answer using scientific notation; retain all nonzero decimal places. (1.9 • 10^4) • (8.4 • 10^5)

148. science

When a truck pulls a trailer, the trailer and truck accelerate forward even though the action and reaction forces are the same size but are in opposite directions. Why don’t these forces balance each other?

149. Spanish

36. "¿Qué hora es?" "Son las once _________." a. por el día b. de la tarde c. de la noche d. en media hora D? 37. "¿Puedes sacar libros de la biblioteca?" "Sí, puedo _____ porque tengo tarjeta de biblioteca." a. las sacar b. a sacarlos c. sacarlos d.

solve x^6

152. coordinate geometry

some smart person solve thiss ;] y-18x+18=4 or help me im confused

153. math

round to nearest integer 14,495.98

154. chemistry

calculate the mass of water produced when 3 g HCL reacts with excess sodium carbonate

155. Math

If a bag contains 50 marbles with 28 red ones and 22 blue ones. A marble is picked at random from the bag.what is the probability of picking a red marble after a blue marble was picked first?

156. Economics

Given the larger population runs in The States than in Canada, the costs are spread over more units. In fact in The States a cost over run of 10% could be dumped in Canada. Given the law of demand, what would happen to the Canadian company? If you worked

157. Calculus

f(x) = (5e^x-6)/(17e^x+13) find f^-1(x). since the domain of f^-1(x) is in the open interval (a, b) what is a and and b?

158. College algebra

f(x)= -(x)^3+11(x)^2-8(x)+7 find f(-2)

159. Math

Emmy is 12. She writes an equation to find her mother's age, m. m - 12 + 35 What operation solves the equation for m? add 12 to both sides, or subtract 12 from both sides, or multiply both sides by 12, or divide both sides by 12

160. calculus

f(x) = (5e^x-6)/(17e^x+13) find f^-1(x). then: the domain of f^-1 (x) is in the open interval (a, b) find a and b

161. algebra

Nakia cut a board of 30ft long into 2 pieces. The ratio of the legnths of the 2 pieces is 2:3.what is the length, to the nearest foot, of the shorter piece

162. Trigonometry (repost Reiny)

at 1:35am I posted ; Write equivalent equations in the form of inverse functions for a.)x=y+cos theta b.)cosy=x^2 my answers were a.) x= y+ cos theta cos theta = x-y theta = cos^-1(x-y) b.) cosy=x^2 cos(y) = x^2 y = Cos^-1(x^2) your post confused me a

163. geometry

bisects and is perpendicular to line segments and . = 96 inches, and line segment = 52 inches. What is the length of ?

164. physics

An air-filled parallel plate capacitor has a plate separation of 0.6 cm, and an area 179 mm2. In femto-farads (fF), what is the capacitance of this capacitor?

165. english

what are some Controversia topics in regards to what is happening in the news currently?

166. Chemistry

1.278 mL of water at 10°C was placed in a 3.0 L container that was sealed and evacuated. Then, 3440 J of heat was added to the water. Determine the pressure inside the container after heating. (Assume all of the heat goes into the water.) d (H2O(s)) 1.00

167. physics

What would happen when a bird would fly in a moving train of speed 200km/h

168. calculus

THE MEAN VALUE THEOREM; APPLICATIONS OF THE FIRST AND SECOND DERIVATIVES..... the base of an isosceles triangle is 6feet. Given that the altitude is 4feet and increasing at the rate of 2inches per minute, at what rate is the vertex angle changing? i really

169. ALGEBRA

If the cost of a cell phone has decreased 400% during the past 10 years, does that correspond to a cost decrease of four times? Explain your answer as though you were talking to someone who has never taken algebra.

170. Math

Rafael wants to use 30 centimeters of wood to frame a rectangular photo. What is the greatest area his photograph could have? a)14 sqaure cm b)36 square cm c)54 square cm d)56 square cm

171. english

star is to ____ as island is to archipelago

172. ALGEBRA

If the global climate were to warm significantly as a result of the greenhouse effect or other climatic change, the Arctic ice cap would start to melt. This ice cap contains the equivalent of some 680,000 cubic miles of water. More than 200 million people

A cart running on frictionless air tracks is propelled by a stream of water expelled by a gas-powered pressure washer stationed on the cart. There is a 1.00-m^3 water tank on the cart to provide the water for the pressure washer. The mass of the cart,

174. science

what happens when an ocean wave hits an oil spill?

d-14=13

176. Math

What is the unit rate of 32 miles per hour?

177. chemistry

A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?

178. algebra 2

what is the foci of the graph x^2/36-y^2/16=1

179. chemistry

A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?

180. health management

As health care manager what two strategies would you consider to help build internal and external relationships that could benefit your organizations?

181. geometry

Which of the following is the best estimate for the area of a regulation archery target if the regulation target has 10 concentric circles, and has a radius of 24 inches.

182. College algebra

f(x)= -(-2)^3+11(-2)^2-8(-2)+7 find f(-2) f(-2)=8+44+16+7=75

183. integrals

integral of (x+6)/5

184. physics

whats the difference between line current and phase current

185. physics

for the equation y = y0 + vy0t + at^2/2, how to I get t alone. Im looking to slove for time

186. physics

what is the kinetic energy of a bear with a mass of 65 Kg and running at a speed of 20 m/s ?

187. Socials

What does Serial format mean? It means--in weekly of monthly installments. What is Whist? It is a card game for four players divided into two teams. What are knick-knacks? What does Spirit-Power mean?

Could someone help me with this question? Which of the following groups of workers lived in poverty? nurses unskilled workes technicians immigrants I'm torn between unskilled workers and immigrants

189. Chemistry

would on mole of nitrogen gas have the same volume as 32g of oxygen gas? Explain.

190. psychology

Which of the following individuals is thought to be driven by intrinsic needs? A. Cheerleader B. A junior varsity basketball player

191. Economics

Given the larger population runs in The States than in Canada, the costs are spread over more units. In fact in The States a cost over run of 10% could be dumped in Canada. Given the law of demand, what would happen to the Canadian company? If you worked

192. Spanish

24. ¿Viste ______ sobre las ciudades de Venezuela el jueves pasado? a. el documental b. la clase c. las clases d. la telenovela A? 26. ¿Escuchó Ud. _____ sobre los coches nuevos? Mi padre ahora quiere comprar uno de esos coches. a. la comedia b. el

193. Math

Leon drove 270 miles to the lodge in the same time as Pat drove 330 miles to the lodge. If Pat drove 10 miles per hour faster than Leon, then how fast did each of them drive?

194. science

i need help with chapter 5.1 for a chemstry review.

195. geography

which two state northeast tip us of the south east region

196. Physic

an "extended object" is in balance when the center of mass is located directly over the fulcrum. By using a test mass mT placed at various points xT on the object (as measured from some fixed reference point), a linear relationship between xT and the

197. history

Shortly after Wilson's first call for a "new world order" a. germany reduced its submarine attacks in the Atlantic b.Turkey left the Central powers and joined the Allied cause c.England asserted the importance of its national goals over Arnerican

198. algebra

I have a space 43 foot long, and 22 stones 10 1/2" diameter each, how far apart to space them?

199. social studies

Compare/contrast real Julius Caesar to play by William Shakespeare

200. calculus

find all horizontal and vertical asymptotes of f(x)=2x^2+7x+12/2x^2+5x-12

y-28=98

203. English

I wanted to clean the desk, because there was no room for anything on it. I, also, wanted to clean it because when papers where put down on the desk you could not find them later that day. Are these two sentences correct? Do you also put commas saying I,

204. Rock Science

Is the soft form of coal found in Slovakia and Slovania called lignite?

205. Math

A 20-foot telephone pole casts a 4-foot shadow. what shadow length will the 6-foot man cast ? A) 1.2feet B) 2.1feet C) 2.2feet

206. English

Can you please tell me if the following expressions are possible? 1) Would it be all right with you if I got my book from the other room? I left it in my backpack. 2) Can you wipe the blackboard off? 3) You should return the book to the library in two

207. math

q(p) = 2.5 p + 3.2; q'(5)

208. physics

A tricycle releases 60 J of gravitational potential energy while rolling 0.59 m directly downhill along a ramp. What is the downhill force (if constant) acting on the tricycle?

209. calculus

f(x) = (5e^x-6)/(17e^x+13) find f^-1(x). then: the domain of f^-1 (x) is in the open interval (a, b) find a and b

210. math

how would I make 2.0 into a fraction

211. pre algebra

how would I make 2.0 into a fraction in siplest form

212. derivatives

Compute f '(a) algebraically for the given value of a. HINT [See Example 1.] f(x) = −2x + 2; a = −5 f '(a) = 1Your answer is incorrect.

213. Sciencies

Identify the major tenets or principles of constructivist teaching.

5 (x) square of 8t (x)square 32t to the 5 power

215. Math

x+y=3 3x+2y=2 How to do this problem with substitution I would appreciated the help.

216. Math

What is the area of a triangle with a base of 16 inches and a height of31 inches

217. Algebra

If your car gets 32 miles per gallon of gas you need to travel 278 miles on day 1, 649 miles on day 2, and 482 miles on day 3. What is the function? What are the domain and the range?

218. Physics

A Vogon’s grandmother, whose mass is 89 kg, drifts through empty space with a velocity of –6.20 m/s until she encounters the 460-kg Ravenous Bugblatter Beast of Traal, drifting with a velocity of +2.80 m/s. When they meet, the RBBoT immediately eats

219. biology

what is the second law of thermodynamics.

5sqrt8T (x) sqrt32T^5

221. math 6 th

A rectangle has a 60-centimeter perimeter. What is the greatest possible area the rectangle could have?

222. Peptide Bonds

Which of the following shows linear sequence of atoms joined by covalent bonds in peptide backbone. a) -N-C-C-N-C-C-N b) -N-C-O-N-C-O- c) -N-C-C-O-N-C-C-O d)-N-H-C-C-N-H-C-C The answer is a). Is that because it's the only one that linear; as in it doesn't

223. english

write a passage using rhetorical devices on aperson, idea or ideology

224. world history

Many early historians tended to look at the past in terms of

225. lccc

An urn contains 4 red and 3 blue marbles. What is the probability when three marbles are selected randomly that all 3 will be red, if we select each marble a) with replacement b) without replacement

226. English

The students are not so talkative in their new seats, but, they still work well in groups. The students are not so talkative in their new seats, but they still work well in groups. Which way is correct?

227. clara baton hs

answer for 182.25+ y squared + 8y

228. chemistry

A gas occupies 8.2 liters at 2.5 atm. What is the pressure if the volume becomes 7.5 L?

229. Science

what effect did the shape of the basketball on your view of the approaching cardboard mountain?

230. Math

Whom should you see at the bank if you need to barrow money?

231. Physics

If a bird moves with an initial velocity of 30secs and accelerates at the rate of 40m/s to cover a distance of 70km/hrs.Calculate the final velocity of the bird?

232. English

Can someone please check this sentence. I want to make sure I DON'T need a comma in the sentence. THANKS! I have found her to be extremely competent in areas by exemplifying her creativeness through many challenges she has taken upon herself.

c-68=78

234. math

slope of (5,3), (3,1)

235. science

what is the cars motion relative to the starting point at time =8 minutes?

236. physics

what are oscillators

237. math

Make r the subject of the formula.V=1/3 pie r square h.2)express V in terms of N,T,K and Y:H=tvk square all over Y

239. Math

a marble is 12mm diameter. What is the smallest height box that is 96mm square that can hold 200 marbles and still have the lid fit on the box without inference

240. Math

multiply and check (a^2+4)(5a^3-3a-1)

241. geometry

a 30 degree angle cuts off an arc in a circle with a diameter of 10in find the length to the nearest hundredth

242. College Algebra

Solve: 2x-9√x +4=0

243. Math

Can someone help me out with project for Data Management. I need some topics that I could use for my thesis/hypothesis (with a lot of information) I had death rates as my topic but my teacher said he does not approve of it because the statistics for it is

244. Physics

find the height from which you would have to drop a ball so that it would have a speed of 9.0 m/s

245. math

the lenght of AB is 6 pi and mAB is 120 degrees. whays the diameter

246. social studies

where did santa anna order the slaughtering of 350 men?

247. English

1. He is Arab. 2. He is Arabian. 3. He ia an Arab. 4. He is an Arabian. (Which one is correct?)

248. Math

there are 3 red marbles , 3 blue marbles and 1 green marble in a bag. A marble is drawn at random from the bag and not replaced. Then a second marble is drawn. What are all the possible outcomes?

249. geometry

Segments with the lengths of 6, 8, and 10 units will form what type of triangle?

251. geometry

You are given two segments, with AB = 4 and with CD = 7. Explain how you could use only the congruent-segments construction to construct with EF = 1.

252. math

Find the set that describes the intersection of each pair of sets: a. C={people who are more than 20 years old}. D={people who are enrolled in college}. b. A={4,6,8}, B={2,4}. c. E={the odd whole numbers}, F={the even whole numbers greater than 40}.

253. language arts

Three Indian elephants patiently towed the logs that had just been cut. is this an adverb clause

254. Europe

glacers fishing is important uses geothermal energy to heat homes was once a territory of denmark

255. algebra

If your car gets 32 miles per gallon of gas you need to travel 278 miles on day 1, 649 miles on day 2, and 482 miles on day 3. What is the function? What are the domain and the range?

256. proabilities

Suppose the NBA has decided to add two more teams to the league. If 18 cities have applied for franchises, what is the probability that in a random drawing, the league selects the two westernmost cities? Having trouble with this one.

257. math

(1-1/2^2 )(1-1/3^2 )(1-1/4^2 )…(1-1/2011^2 )

258. Math

m=2,4,6,8 and n=18,16,14,12 what is the equation for m and n

259. ENGLISH

Please check for commas errors, speling and any other grammar error. Please provide the correc answer. The quality in the air in our community interests all of us. We must all work together to keep the air safe for our children. During the past six months

260. Anthro. - Project

I am doing a poster project, where I have to research the use of great apes today and I have to decide if I am for it or against it. Where can I find the best information for this topic? Thank you.

261. Economics (SraJMcGin)

Given the larger population runs in The States than in Canada, the costs are spread over more units. In fact in The States a cost over run of 10% could be dumped in Canada. Given the law of demand, what would happen to the Canadian company? If you worked

262. statistics

Can someone help me out with project for Data Management. I need some topics that I could use for my thesis/hypothesis (with a lot of information) I had death rates as my topic but my teacher said he does not approve of it because the statistics for it is

263. health

what is nicotine?

264. Biology

The human retina has an area of about 1000 mm^2. If we have a total of 125 million rods and 6.5 million cones in each eye, show that we have about 131,500 sensory cells per square millimeter in the retina.

265. algebra

aT 12 MPG, AND 4\$ per gallon, what is the cost to drive 525 mi

2/5 of 15=?

267. math

patterns and equations: x: 0,3,__,10 y: __, 8, 12,15

268. math HELP PLS!

using 4 fives, with any signs( +, -, /, x, etc.) sum to 24.

269. math

what is the value of c approximatedto 3 decimal places ,, the value of c is 112 and can you explain as how to get the answer

270. math

what is the value of c approximatedto 3 decimal places ,, the value of c is 112 and can you explain as how to get the answer

271. grammar

after graduating from te dog acadeny wivues decide to stat is own rock and roll band identify declarative or interrogative

272. sex ed

what is a virgin?

273. Stats (Chi-Square)

Suppose you have a chi-squars GOF test to test null hypothesis that the age distribution of drivers stopped in 2003 for traffic violations is the same as the age distr. in 2002. You compute chi-square= 14.7. At the 5% significance level, what is an