1. Math

Which of the following statements is not true regarding operations with exponents? A.)To divide powers with the same base, subtract the exponents. B.)To subtract powers with the same base, divide the exponents. C.)To multiply powers with the same base, add

2. chemistry

What has the higher normal melting point: CHI3 or CHF3? The answer in the book is CHI3. So I'm assuming the answer is CHI3 because Iodine is the bigger and will form larger london dispersion forces, but isn't a stronger dipole moment formed in CHF3 because

3. trig

Use a table of trigonometric values to find the angle θ in the right triangle in the following problem. Round to the nearest degree, if necessary. cos θ = 0.9659 A = ? H = 20

4. maths-urgently needed

The volume of a cylinder is 48.125 cm3, which is formed by rolling a rectangular paper sheet along the length of the paper. If cuboidal box (without any lid i.e., open at the top) is made from the same sheet of paper by cutting out the square of side 0.5

5. math

In the diagram, transversal GH intersects parallel lines AB amd CD. m

6. Science

State in words the specific information conveyed by a label reading 0.25M Oxalic acid.

7. economics

Kimberly works for a well known financial company as a sales representative. She earns a small base salary but receives commission off every product she sells. Kimberly has basic living expenses in addition to a student loan. She wants to start adding to

8. HOMEWORK

Choose two authors from the early American and Colonial period. Identify what they wrote and, in one to three paragraphs, compare their purpose, audience, and style. (25 points

9. Chemistry

Calculate the radius of a vanadium atom, given that V has a BCC crystal structure, a density of 5.96 g/cm3, and an atomic weight of 50.9 g/mol. I used this equation: density = (2)*(atomic weight) / (volume of unit cell)*(Avagodro's #) rearranged to find

10. Design

Which design style encourages a complete manipulation of floral materials into unnatural geometric shapes and colors? A. Abstract B. New convention C. Ikebana D. New wave im thinking B

11. Math

A fraction reduces to 36. If its denominator is 6x5, what is its numerator? A.)63x B.)63x5 C.)6x5 D.)67x5 I think the answer is B. Thank You.

12. math

A set has 256 subsets how many element has the set?

13. Design

What is the difference between the vegetative style and the landscape style of flower arranging? A. Vegetative arrangements group same-season flowers together, while landscape arrangements don't. B. The vegetative style features flowers as they're found in

14. Physics

suppose that two point charges each with a charge of +1 coulomb are separated by a distance of 1 meter will they attract or repel ? determine the magnitude of the electrical force between them

15. Algebra

A baseball player's batting average is the number of hits the player has divided by the number of at-bats. At the beginning of a game, a player has a batting average of .360. During the game, the player gets 3 hits during 5 at-bats, and his batting average

16. Math

If a wheel turning at a constant rate completes 100 revolutions in 10 sec what is its angular speed?

17. nutrition and wellness

Write a 300-500 word essay. Provide Three examples of sporting events, or fitness activities, with which you have been involved. Describe what energy pathway was used in that sport or activity and explain why you are matching the pathway with the activity.

18. Physics

An 81 kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is .49. a) what is the magnitude of the frictional force? b) If the player comes to a rest after 1/6s, what was his initial velocity?

19. English

Hi, I have a english exam coming up on poetry and Hamlet... the first part is Part A ;Passage Analysis: Choose only three of the following passages from the play Hamlet to comment on. Each response should be concise and well written in full sentences...so

20. Chemistry

A steel tank at 300 K contains 0.285 L of gas at 1.92 atm pressure. The tank is capable of withstanding a maximum pressure of 5.76 atm. Assuming that doubling the kelvin temperature causes the internal pressure to double, a. at what temperature will the

I'm having trouble determining the range movie tickets sold by looking at a histogram. I know you normally take the highest value represented and subtract the lowest value from it to get the range. However, when you have a histograme and the data set is

22. Math

The amount of money Kylie spends on food to the amount she spends on gas per week is 7:4. She spends \$45 more on food than gas. How much does she spend on food? How much does she send on gas? On one of the weeks, she spends an additional \$75 on food for a

23. Chemistry

Calculate the radius of a vanadium atom, given that V has a BCC crystal structure, a density of 5.96 g/cm3, and an atomic weight of 50.9 g/mol. I used this equation: density = (2)*(atomic weight) / (volume of unit cell)*(Avagodro's #) rearranged to find

24. Design

What is the difference between layering and terracing? A. More depth can be achieved with layering than with terracing. B. In layering, the materials are more three-dimensional than in terracing. C. In layering, materials such as leaves can't be reversed

25. MATH

A box contains 6 red pencils and 8 black pencils. what fraction of thr pencils are red?

26. English

Which of the following is equivalent to x^5 y^2/xy^2 when =/ 0 and y =/ 0 ? (1 point) A.) X^6 Y^5 B.) X^5 Y C.) X^4 Y D.) X^4 I don't even have a good guess. Thank you.

27. astronomy

If we represent the sun as volleyball (diameter =65cm)how far away would be find earth in this model? Note the suns actual diameter is 1.4x10^9 meters.

Find the limit (if it exists). (If an answer does not exist, enter DNE.) lim f(x) as x approaches 3, where f(x)= x^2-8x+9 if x/3 (greater than or equal to 3)

29. Physics

A ladder 20m long rest against a vertical wall so that the foot of the ladder is 9m long. Find correct to the nearest degree the angle that the ladder makes with the wall.

30. math

Jeremy collected nickels for one week. He is making stacks of his nickels to determine how many he has. The thickness of one nickel is 1/4 in. How tall is a stack of 4 nickels? 3 nickels, 2 nickels?

31. math helpp

8. Convert the scale to a unit rate. Show your work. Interpret the meaning of the unit rate.

32. maths-urgent

Arjun spent Rs.12 to purchase some pens and pencils.The cost of a pen and pencil are in the ratio 3:2. the total cost of a pen and a pencil is Rs. 3. if the total number of pens and pencils he purchased is7, find the number of pens he purchased.

33. Math plz HELP!

At 7pm the temperature outside was -5 celsius. What does -5 represent in this situation? A. The change in temperature the last hour B. The number of degrees between 0 Celsius and -5 celsius. C. The temperature at 7pm D. The number of hours when the temp

asked by T.J And the Vibe
34. astronomy

a remote internet webpage may sometimes reach your computer by going through a geostationary satellite orbiting approx. 3.6x10^7m above earths surface. What is the minimum delay in seconds that the webpage takes to reach your computer.

35. Physics

A 12000 kg airplane launched by a catapult from an aircraft carrier is accelerated from 0 to 200 km/h in 3 s. (a) How many times the acceleration due to gravity is the airplane's acceleration? (b) What is the average force the catapult exerts on the

36. analytical geometry

if (l1,m1,n1),(l2,m2,n2),(l3,m3,n3) are the direction cosines of three mutual perpendicular lines,show that the line whose direction ratios area l1+l2+l3,m1+m2+m3,n1+n2+n3 make equal angles with them

37. chemistry

Calculate the molarity of a solution made by dissolving 12.5 grams of Na2CrO4 in enough water to form exactly 550 mL of solution.

38. chemistry

Calculate the molarity of a solution made by dissolving 12.5 grams of Na2CrO4 in enough water to form exactly 550 mL of solution.

39. Physics

A boy on a 2.4 kg skateboard initially at rest tosses a(n) 8.2 kg jug of water in the forward direction. If the jug has a speed of 3.0 m/s relative to the ground and the boy and skateboard move in the opposite direction at 0.57 m/s, ﬁnd the boy’s mass.

40. Physics

Suppose you pour water into a container until it reaches a depth of 12 cm. Next, you pour in a 25-cm-thick layer of oil so that it floats on top of the water. The density of the oil is 0.92 g/cm3 and that of water is 1.00 g/cm3. What is the pressure at the

41. Chemistry;HELP

Use the 5-step method and be sure to include units where appropriate. Round your answers to the correct number of significant digits. Mass m Density = -------------- or D = ------ Volume v Adjust the density formula and solve the problems below: m D =

42. Physics

A ladder 20m long rest against a vertical wall so that the foot of the ladder is 9m long. Find correct to the nearest degree the angle that the ladder makes with the wall.

43. research

A quantitative analysis method which aggregates a number of (similar) individual studies into a large data set from which to compute an over all “effect size” (based on similar study procedures and treatments) is commonly known as…?

44. Design

_______ refers to the process of tying materials together to hold them in place in an arrangement. A. Binding B. Clustering C. Banding D. Grouping

45. Economics

Owners of digital cameras have to buy memory cards in order to use the cameras. Cameras and memory cards are: A. substitutes. B. complements C. unrelated. D. elastic.

46. Visual Basic (Computer Programming)

ALGORITHM EXERCISES 1. Wilma Peterson is paid by the hour. She would like a program that both calculates and displays her weekly gross pay. For this exercise, you do not need to worry about overtime pay, as Wilma never works more than 40 hours in a week.

47. math

A 20-ft by 40-ft swimming pool is surrounded by a deck d feet wide. What is the area of the deck?

48. math

Rachel is curious about the number of pets that people own. She surveyed her 20 classmates, asking them exactly how many pets they own. Rachel's data is shown below: Number of Pets 0 Pets 1 Pet 2 Pets 3 Pets Number of Classmates 9 6 1 4 What is the mean

49. Chemistry

At room temperature, ethanol's density is 0.789 g/mL while water's density is 0.997 g/mL. When a few milliliters of ethanol are added to water, the two liquids mix. A student is given a unknown liquid at room temperature and experimentally determines its

50. word problems

harris is planting a rectangular garden with an area of 24 square. he is also putting a fence around his garden. how should he arrange his garden so he can buy the least amount of fence possible?

A model car is a 1/43 scale model of the original car. What is the scale factor needed to find the dimensions of the original car? model car=4.2" long, 1.3"tall, and 1.6" wide?

52. math

Why is 2482 not a reasonable answer for 542x6

53. Chemistry

What mass of CH4 is contained in a 443 mL sample of CH4 at −32◦C and 282 torr? Answer in units of g. I tried so many times and I don't get it!

54. math

the difference of y and 3 amounts to 12. Write each sentence as an equation

55. social studies

i need help!!!!! one type of lightning bug glows once every 1 1/2 seconds. how many times can it glow in 1 minute? and the other one is : Bea can run 1/6 mile in 2 minutes. how long should it take her to run 2 miles? please help the teacher wont help me

56. s.s

4. How did the United States change as it became more economically independent? (Select TWO correct responses.) Population decreased as trade with other nations was stifled. The growth of factories and trade led to the growth of American cities. Congress

57. Geometry

Is it possible for a cross section of a cube to these shapes.... -pentagon -isosceles triangle -scalene triangle ..... If so, please describe how the plane intersects the cube. Thanks!!!!

58. physics

An observer rides with a moving sound source directly toward a large vertical wall. The vehicle has a constant speed of 10m/s and the source has a frequency of 150Hz. What beat frequency is heard by the observer as a result of the combination of the direct

59. Math

Annie likes to walk 2 steps, jump 2 steps and then skip 2 steps. If she does this pattern over and over again for a total of 52 steps, how many jumping steps will she make?

60. Algebra

A gardener combines x fluid ounces of a 20% liquid fertilizer and 80% water mix with y fluid ounces of a 5% liquid fertilizer and 95% water mix to make 30 fluid ounces of a 10% liquid fertilizer and 90% water mix. a. Write a system of linear equations that

61. astronomy

if the earths orbit is 1.5x10^8km, determine how fast earth moves along its orbit assume there are 365 days in a year. remember the circumference of a circle is equal to 2pi where r is the radius.

62. Geometry

a cat is stuck 15 feet up in a tree.to get it down,you will place a ladder 5 feet from the base of the tree.how tall must your ladder be in order to reach the cat? Round to the nearest foot

63. chemistry

Calculate the molarity of a solution made by dissolving 12.5 grams of Na2CrO4 in enough water to form exactly 550 mL of solution.

64. analytical geometry

show that the locus of a point whose distances from two given planes are in a constant ratio, is a plane.

65. Physics

A 0.055 kg golf ball leaves the tee at 50 m/s. what is its change in momentum (impulse) ?

66. physics

A 40 gram bullet is fired horizontally from a gun with a momentum of 2.8 (kg*m/s) and embeds itself into a 300 gram block of wood initially at rest on a wooden horizontal surface. After this collision the wood block slides 15 meters before falling off a

67. Physics

suppose that two point charges each with a charge of +1 coulomb are separated by a distance of 1 meter will they attract or repel ? determine the magnitude of the electrical force between them

68. physics

a body of mass 5kg initially at rest is subjected to a force of 20N. find the kinetic energy acquired by the body at the end of 10s.

69. Chemistry

explain why a sealed bag of potato chips "puffs out" (increases in volume) if taken from sea level to a high mountain pass. I know this has to do with pressure.. so is it because the higher up you go, the less pressure there is? Thanks!

70. physics

A 91.0 N grocery cart is pushed 17.1 m along an aisle by a shopper who exerts a constant horizontal force of 42.0 N. The acceleration of gravity is 9.81 m/s2 . If all frictional forces are neglected and the cart starts from rest, what is the grocery

71. English

Your favorite cousin has moved to your town and is looking for a job. Her previous experiences are working as a cashier and sales clerk at two department stores. You know she plans to apply at similar stores in your town. But you also know she is a perfect

72. Algebra

The length of a rectangle is 5 inches greater than the width. The sum of the length and width is 41 inches. Find the length and width of the rectangle.

from this pragrap what relationship can youinfar between the jogger and the writer

74. Spanish.

Help answer please? ¿Qué animal fue importante para el éxito de los conquistadores? ¿Cuál país conquistó Hernán Cortés? ¿Cómo se llama el conquistador de Perú?

75. College Trigonometry

From a point 200 yards from the foot of a building, the angle of elevation to the top of the building is 37 degrees. Find the measure of the angles of the triangle formed by the building, the ground, and the line of sight to the top of the building?

76. economics

How does a budget differ when you have an irregular income vs. a predictable income? irregular income is monthly budget.

77. maths

A statistician wants to estimate the mean weekly family expenditure on clothes. He believes that the standard deviation of the weekly expenditure is \$125. Determine with 99% confidence the number of families that must be sampled to estimate the mean weekly

79. physics

two forces 20N each are inclined at 100 degree to each other.find the single force that will; replace the given force system balance the given force system

80. algebra

Parking in a student cost \$3 for the first half hour and \$1.50 for each hour thereafter. A partial hour is charged the same as a full hour. What is the longest time that a student can park in this lot for \$9?

81. chem

When saccharin is added to pure water, the freezing point of the resulting solution drops to -5.0C, Calculate the freezing point depression of the aqueous saccharin solution. Note: freezing point of pure water is O.0C... Stuck thanks so much!

82. Math

Calculate the limit: lim(((arccos x)^(n+1))/((arccos x)^n) with x tends to 1-, for every n that belongs to N, and then prove that lim(((arccos x)^n)/(arccos x))=sprt(n).

83. Mechanics & hydromechanics

Three forces pulling on a body are in equilibrium. The direction of one is due south, the direction of another is 80 degrees east of north, and the third force acts in the direction of 35 degrees west of north. If the magnitude of southerly force is 38 N,

84. Chemistry;HELP

Use the 5-step method and be sure to include units where appropriate. Round your answers to the correct number of significant digits. Mass m Density = -------------- or D = ------- Volume v Adjust the density formula and solve the problems below: m D =

85. Pre-Algebra

The Jaspers collect nickels, dimes, and quarters in a jar. When they count the change in the jar, there are twice as many nickels as there are quarters. If there is \$15.30 in dimes and \$74.80 in all, how many quarters are there. Please include an equation

86. analytical geometry

show that the locus of a point whose distances from two given planes are in a constant ratio, is a plane.

87. aig math

Fill in the missing sign to make the equation true. 125 _ 5 _ 12 _ 2 = 1

88. math

the quotient of four and the sum of a number and one. Use x to represent each unknown number

89. math

in 2005,Eastside elementary school was built at a cost of \$18,000,000.the school it replaced was built in 1935 at the cost of \$180,000.explain how the values of the 8 in each number are related.

90. Chemistry

A steel tank at 300 K contains 0.285 L of gas at 1.92 atm pressure. The tank is capable of withstanding a maximum pressure of 5.76 atm. Assuming that doubling the kelvin temperature causes the internal pressure to double, a. at what temperature will the

91. physics

Consider two vectors where F1 = 53 N, F2 = 81 N, 1 = 320 , and 2 = 13 ,measured from the positive x axis with the counter-clockwise. What is the magnitude of the resulting vector?

92. math

which 1 of the following is a true proprotion A. 7:9=8:9 B.2:1=1:2 C.54:9=6:3 od D.3:4=9:12 please answer

The Jaspers collect nickels, dimes, and quarters in a jar. When they count the change in the jar, there are twice as many nickels as there are quarters. If there is \$15.30 in dimes and \$74.80 in all, how many quarters are there. Please include an equation

94. Algebra

The length of a rectangle is 5 inches greater than the width. The sum of the length and width is 41 inches. Find the length and width of the rectangle.

95. math

Aliquot divisors are all the divisors of a number except the number itself. The product of the Aliquot divisors of a number is somtimes equal to the square of the number. The Aliquot divisors of of 12 are 1 ,2 ,3 ,4 ,6. Their product,1x2x3x4x6=144=12*2 is

96. math

express 16^21/2^7 - 5^12 in simplest fotm

97. Chemistry

Solid magnesium reacts with oxygen gas to produce 568g of solid magnesium oxide.

kimberly used coupons worth \$1.00 off and \$1.25 off and two coupons for \$1.50 off. if the discount of each of these coupons were doubled, how much would kimberly save?

99. English

You’ve applied for a specific job in your field of study. The Human Resources Department arranges an interview and tells you to bring with you a polished piece of writing for them to evaluate your writing skills. The paragraph must describe one

100. chem. quick help

Ni(OH)2(s) + H2SO4 = 2H2O + NiSO4 so i balance this problem but I don't know the states of matter except the first one

101. Mechanics & hydromechanics

Where a 1208 N weight must be hung on a uniform 214 m pole so that a boy at one end supports one-third as much as a man at the other end.

102. math

Annie likes to walk 2 steps, jump 2 steps and then skip 2 steps. If she does this pattern over and over again for a total of 52 steps, how many jumping steps will she make?

103. Math Help!!

Bottom part of a greenhouse frame has a length of 350 cm width of 220 cm and a height of 250 cm. Angle at the peak of the roof measures 90 degrees. Sketch the frame and label it with its actual dimensions. Use a scale of 1:25 to calculate the measurements

104. Math

The Jaspers collect nickels, dimes, and quarters in a jar. When they count the change in the jar, there are twice as many nickels as there are quarters. If there is \$15.30 in dimes and \$74.80 in all, how many quarters are there. Please include an equation

105. health

To keep a positive attitude on the job, you should A. look for the perfect company—this will ensure everything will be all right. B. complain about the things that bother you so they can get straightened out. C. encourage others to help you with your

1. How many chromosomes do human sex cells have? (1 point) 22 43 46 23 2. The actual genetic makeup of an organism for a particular trait is called the ______. The physical characteristic that trait gives the organisms is called the ______. (1 point)

107. geometry

determine the measure of

108. Chemistry

(b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid?

109. biology

If the side chain of a glutamic acid residue has a pKa of 4.1, at pH 6.1 the ratio of uncharged to charged side chain would be about A. 100:1 B. 10:1 C. 1:1 D. 1:10 E. 1:100

110. MATH PROBLEM

-One revolution of the Sun by the Earth requires 365 days, 5 hours, 48 minutes and 49.7 seconds. the 5 hours, 48 minutes and 49.7 second is approximated to 1/4 of a day. Every 4th year, one full day is added( leap year). How much of an error in minutes and

111. Algebra with applications

A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows: 29 said they drove alone. 36 rode in a carpool. 36 rode public transportation. 6 used both carpools and public transportation. 4 used

112. Math

A moving truck fills up a shipment at an od adress, at (-2,1). It travles 7 blocks south and 6 blocks east to the new adress. What is the location of the new adress? PlEASE ANSWER THIS AS FAST AS POSSIBLE!! Amanda

113. Math

a building with 143 windows has more than two floors; each floor has the same number of windows as every other floor. If there are less than a dozen floors how many windows are on each floor.

114. Math Word problems

A number of birds were in a tree. Half flew away. 6 more flew away, a quester of the birds remained. How many birds were originally in the tree.

a pack of 8 collectable cards contains 1 rare card, 3 uncommon cards, and 4 common cards. If Javier has 45 packs of cards, how many more uncommon cards does he have than rare cards?

116. Physics

A 40 gram bullet is fired horizontally from a gun with a momentum of 2.8 (kg*m/s) and embeds itself into a 300 gram block of wood initially at rest on a wooden horizontal surface. After this collision the wood block slides 15 meters before falling off a

117. Astronomy/Conversion

There are 365.25 days in a year, 24 hours in a day, 60 minutes in an hour, and 60 seconds in a minute. Convert years into seconds. Show your work and keep 5 significant figures. Ok, so finding it is easy (multiply 24, 60, 60 and 365.25) but how does the

Paul Acorn maintains that the distinction between human and animal manipulation of the natural environment to create artifacts is: a. Technology b. the ethical application of technology c. Choice d. Creativity and adaptation

119. Science

What is the current draw of a 2 kW heater when operating at 240 V?

120. AP Chemistry

In a ﬁt of boredom, a chemistry teaching assistant swallows a small piece of solid dry ice (CO2). The 8.9 g of dry ice are converted very quickly into gas at 311 K. Assuming the TA’s stomach has a volume of 1.5 L, what pressure is exerted on his

121. College Algebra

I posed these one's before but added parenthesis which I think made it confusing as the actually questions do not have them. So, I'm reposting them without to see if it makes sense. If not I understand. 1. Compute as indicated. Write your answer in lowest

122. geography

how was colonial america both godly and devilish?

what is the rule for why "achieved' is spelled that way instaed of "achieveed"?

124. Math

5/8 + 3/4 + -2/3 - 5/6 = mixed number form

asked by T.J And the Vibe
125. science

what is the gravitational potential energy of an object to its weight multiplied by its what?

126. math

A tree stands 75feet tall and cast a shadow that is 50feet long. What is the angle of elevation from where the shadow ends and the top of the tree

127. math

The diagram Cindy made is a lacrosse field, the model is 5 1/2 inches long and 3 inches wide if 1 inch equals 20 yards what is the area of the field?

asked by T.J And the Vibe

If the side chain of a glutamic acid residue has a pKa of 4.1, at pH 6.1 the ratio of uncharged to charged side chain would be about A. 100:1 B. 10:1 C. 1:1 D. 1:10 E. 1:100 -i HAVE NO IDEA Which of the following amino acids has a side chain that can serve

129. Math

A bicycle with 26inch diameter wheels is travelingat 10 mph. To the nearest whole number how may revolutions does each wheel make per minute?

130. Social Studies

how does elevation affect climate in the arabian peninsula?

131. Mechanics & hydromechanics

Find the magnitude and direction of the equilibrant of two forces, one being horizontal pull of 18 N and the other a pull of 23 N at 50 degrees to the 12 N force.

132. English

Revised from Wednesday, January 16, 2013 (10:46 a.m.) I choose to become a Medical Transcriptionist to use my skills in writing, spelling, grammar and punctuation. My passion for medical transcription arose because of my love for research and thirst for

133. science

what is the unity of life? if asked to explain two examples could it be a human and a chimp or would the two examples be DNA and RNA?

134. Mechanics....Urgent!!

Find the magnitude and direction of the equilibrant of two forces, one being horizontal pull of 18 N and the other a pull of 23 N at 50 degrees to the 12 N force.

135. Geometry

A lined napkin,in the shape of a square,has sides 9-inches long.if the napkin is folded along the diagonal,what is the length of the diagonal ?

136. Cosmology

Lookback time for a given redshift, tL(z), is... * time between the given redshift and the beginning of the Universe. * time between the infinite and the given redshift. * equal to the age of the Universe at the given redshift. * time between now and the

137. Cosmology

In a universe where the scale factor is proportional to t^α, where t is time and α is a constant less than one, the universe has: * the sign of the acceleration is undetermined * negative acceleration * positive acceleration * zero acceleration

138. Chemistry

(b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid?

139. Chemistry

(b) How many moles of HCl are present in 35.0 mL of a 4.50 M solution of nitric acid?

x+y=0 3x+y=-4 Sovle each system of equation by graphing. If got the answer (-3,3), but it's not there. Please explain!

141. algebraic expressions 5th grade math

larry and martha each planted the same number of carrots seeds in their gardens.After 4 weeks,larry had c carrots and martha had 6 more(write an expression)please help me solve,thank you

142. bio

The most common protein secondary structures (the alpha helix and beta conformation) are stabilized primarily by A. ionic bonds B. hydrogen bonds C. disulfide bonds D. van der Waals interactions E. hydrophobic interactions

143. analyytical geometry

find the equation of the planes 5x-3y+4=0 and x+y-2z+10=0 and which are 1 unit distance from the origin.?

144. GENERAL CHEMESTRY

Analyze the properties of a sodium atom and a sodium ion. What are the differences in mass, stability, and reactivity that are caused due to the differences between the sodium atom and sodium ion? Provided an in depth explanation or analysis of subject or

145. math

i need help in how to check my answer for an equation problem. The problem is -n over 2 equals to 18 i already know what -n is [-36[ but now how do i check it

146. science

a sphere of mass 500.0g is released from point A 5m above the ground and slides down to point B 3.2m through point C 2m in frictionless wire track. (1)determine the particle's speed at points B and C. (2)determine the net work done by the force of graviy

147. math

nate cut a pie into 7 equal pieces. he gave one piece to his dad and three times as much to his brother Chris. what fraction of the pie was left?

148. chemistry help plz

Explain what the terms chiral atom and chiral molecule mean.

149. chem

Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (: grease and CS2 how do you know this

150. math

what is 62 above 0?

151. Social Studies

are there social systems in the Saudi Arabia or anywhere in the Arabian Peninsula?

152. Significant Figures

I'm having a hard time with significant figures. Any help would be appreciated. The first one is 0.0000000502. I put that it has three significant figures. Is this correct? The other numbers I haven't a clue about are: 5.52 299,792,458 206,265 I get the

153. Biostatistics

Hi, I have answered some questions for some homework and I've got one of them wrong. I cannot modify my answer but I would really love to know why my answer is wrong. This is the statement of the problem: n this series of questions, we examine data from a

154. Math

a building with 143 windows has more than two floors; each floor has the same number of windows as every other floor. If there are less than a dozen floors how many windows are on each floor.

155. One college algebra ?

Hello I have a question about a problem. The problem is (- 25/9)^3/2. Its multiple choice however I think they are tricking us. A. 125/27 B. - 125/27 C. 125/3 D. Not a real number I got A as an answer but feel that it is not a real number?

156. Statistics

Suppose you were in charge of advertising for an automotive dealership when the gas prices increased to \$4 per gallon. Most of your cars are fuel-efficient, but you have two models that have extremely poor fuel economy, that is, a low number of miles per

157. English languege

What is antonym of sharp

158. Gr 9 Science - physics

If all 3 resistors in a series 12V circuit are the same, what will the voltage be across resistor no. 3?

159. science

lengths of railway tracks have small gaps between them. Why are the tracks built this way and what might happen it there were no gaps?

160. Geometry honors

the endpoints of AB are a(-3,5) and b(9,15). find the coordinates of the points that divide AB into 4 congruent segments

161. Calculus 3

Let L be the line that passes through the points (0,1,6) and (0,3,2). Find the length of the projection of k= on the line L. I know how to do this if one part of the vector k is touching the line, but unless i'm mistaken, that is not the case in this

162. Calculus 3

Let L be the line that passes through the points (0,1,6) and (0,3,2). Find the length of the projection of k= on the line L. I know how to do this if one part of the vector k is touching the line, but unless i'm mistaken, that is not the case in this

163. math

Write each sentence as an equation. The difference of y and 3 amounts to 12.

164. Math

Find the principle, given r=3% and t=3/4 years, a=2556.25

165. Algebra

1. Create the indicated algebraic expression. Use descriptive variables. The length of a rectangular lawn is 6 ft more than three times the width of the lawn. Express the length of the lawn in terms of the width. A. 3+w+6 B. 3(w+6) C. 6w+3 D. 3w+6 For 1 I

nina has a quilt. 1/3 of the square on it are pink. rosa has the same size quilt. the fraction of pick square on her quilt is greater. which fraction show the pink squares of rosa's quilt. A 1/2 B 1/5 c 1/4 D 1/6

167. Physics

Question: particle J with zero initial mass and X energy accelerates from a static start to 'C' (light speed) in a time frame of N and mass increases 10 to the 28th power per nanosecond- -What is the mass on particle J? -What is the energy of particle J?

tyrone and jerome have the same number of marbles. 3/6 of tyrones marbles are blue. jerome has fewer blue marbles. which fraction shows the number of blue marbles jerome has A. 1/2 B. 2/4 C. 1.6 D. 4/6

169. 6th grade s.s forgot textbook in locker!!!!

Need help immediatly!!! If someone already posted please still post! And I'm not doing this becuze I'm lazy but becuze I forgot my textbook in my locker and there's nothing on the internet to help!!! TOPIC: NORTHERN EUROPE 1.What river makes london a

170. physics

Why metal was used to make each object you should consider to propies of metal when you answear this question

kate ate 3/3 of sandwich. cao ate 7/7 of a sandwich that was the same size as kate's who ate more. explain you answer

Two thirds of the musicians in a 16-piece band are girls. the 16 musicians include 12 brass players. what fraction of the band plays brass instrument.

173. math

8n^2+14n-15=0

174. math

the quotient of n and 5 is 4 times n. Write each sentence as an equation

175. math

there are two 2's in 299,792,458.name the place value of each 2.explain how their values are related.

176. Algebra

I have two terms. 3.675v^1 + 0.096v^2 do I add these exponents?

177. Math

Juan says the diameter of circle with a radius of 8 inches is 4 inches. What is his error? What is the correct diameter?

178. math

susie writes the division fact 20/5=. write the remaining fact in this fact family.

179. algebra

The perimeter of a rectangle equals the sume of the lengths of its four sides. If the width of a rectangle is 9 inches and its perimeter is 52 inches, find the length of the rectangle.

180. Math Word problems

A number of birds were in a tree. Half flew away. 6 more flew away, a quarter of the birds remained. How many birds were originally in the tree.

181. Mechanics & hydromechanics

A uniform plank AB of length 4.6 m and weight 508 N is suspended by a vertical rope at each end.A girl of weight 305 N stands in the position 1.6 m from one end.Calculate the tension in the rope at one end using the other end as axis of rotation.

182. math

• regular rate: \$2.10/lb • ship 101 to 500 lb, get a 20% discount • ship over 500 lb, get a 40% discount A large medical supply company has promised to donate 12 hospital beds and 4 wheeled stretchers over four months. Each bed weighs 58 kg and each

183. math

Which dimensions of two rectangular prisms have volumes of 100 m3 but different surface areas

184. help

3/10 and 7/8 can u help me convert it then simplify my biggest answer is 24/70

185. Geometry

What dose a squared , b squared , c squared represent ?

186. math

How much cans of paint is needed to cover an area of 36 metres square if one can covers 25meters square.

188. social science

1) Which large European city declined significantly in population over the past century? A) Paris B) London C) Rome D) Madrid 2) The industrial city was characterized b A) decentralization B) corporate growth C) manufacturing D) commerce 3) Modern humans

189. english

How important of a factor does money play in the lives and happiness of individuals? is this sentence grammatically correct?

190. Cosmology

The most cosmological measurements show that the universe is extremely flat (Ωk≈0) and that the surface brightness of objects scales with the fourth power of redshift (SB∝z^−4). If the universe was still expanding, but had strong negative curvature

191. Cosmology

In an Einstein-de Sitter (matter-dominated) universe, the scale factor is proportional to time to the power of: * 3/2 * 2/3 * 1/2 * -1/3

192. Cosmology

A curvature constant of k=0, as used in the Friedmann equation, means: * The universe is open * The universe is matter-dominated * There is no dark energy * The universe is flat

193. Physics

How many joules would be required to raise the temperature of 20g of ice at oC to water at15C?

194. statistics

The mean of a normally distributed data set is 226.2. The data item, 230, has a z-score of 0.2. Find the standard deviation.

195. biology

Which of the following amino acids has a side chain that carries a negative charge in its conjugate base form? A. H B. W C. C D. K E. N

196. Geometry

A^2 , b^2 , c^2 represent

197. Science

What's a benefit and risk of nuclear energy?

198. political science

what are the argument for and against politics being a science

199. analytical geometry

two edges PQ,RS of a tetrahedron PQRS are perpendicular,show that the distance between the mid-points of PS and QR is equal to the distance between the mid points of PR and QS

200. analytical geometry

the axes are rectangular and a point P moves on the fixed plane lx+my+nz=p.the plane through P perpendicular to OP meets the axes in A,B,C parallel to YOZ,ZOX,XOY intersect in Q.show that the locus of Q is p{1/x2+1/y2+1/z2}=l/x+m/y+n/z

201. economics

Jesse and Kimberly recently graduated from college and are starting a family. Currently, they are just making ends meet with their \$45,000 salary. They want to contribute the maximum amount (currently \$2,000) to fully fund an Educational Savings Account

202. food

how much is 2/3rd of a cup of sugar when it is .36 a cup?

203. Algebra

Subtract. [2x/(x^2-y^2)]-[7/(y-x)] Thank you! :)

204. Algebra 1

Using the point-slope form of a line, y-4= -2(x+3) identify the slope. b. Transform this given equation into slope-intercept form.

205. Math

How many fencing materials will be needed if the measurements of the sides of the lot to be fenced are 37.5m and 24.8m?

206. Math

How many fencing materials will be needed if the measurements of the sides of the lot to be fenced are 37.5m and 24.8m?

What effects does depreciation have on cash flow? When it comes to ratio analysis, which ones are the most important? Which businesses might use certain ratios more than others and what was the purpose of the Du Pont Indentity?

208. algebra

9w + 3 = 6(w - 2)

209. Math - missing fraction

Please advise how it is I go about finding the missing fraction. I get so confused. The problem is: N-3/5=1/4 I know the LCD would be 20 but from there, I am lost. Thank you.

210. INTRODUCTION TO MANAGING PERSONAL HEALTH

The one area you can't control to reduce your chances of stroke, heart disease, or diabetes is?

211. English

I'm doing an essay on generalizations and I need 3 paragraphs on it. Also, I need help thinking on what generalization I should do and how I can support it.

212. Algebra

What is the x-coordinate of the solution of the system y=1/3+8 and 2x-y=2?

213. science

lengths of railway tracks have small gaps between them. Why are the tracks built this way and what might happen it there were no gaps?

214. Chemistry

1. How would you take 1L of an existing solution with a concentration of 1M and use it to make a new solution of 0.1 M? Be specific. 2. Would it be possible to easily create a 2 M solution from 100 mL of 1 M solution? Explain why or why not?

215. Algebra

Is it possible to find a value for c so that the linear system below has exactly one solution? Explain. 5x+3y= 21 Equation 1 y= -5/3x+c Equation 2

216. Chemistry

What is the dilution formula? I have not learned this,

217. math

the first landscaper charges \$16 per hour to landscape my house, plus \$225 for the products needed. the second landscaper charges \$61 per hour (products included). for how many hours will the cost of either landscaper be the same?

218. Gr 9 Science - physics (part 2)

If the current at one corner of the 12V series circuit is 1.0 A, what is the current at corner number three (all three resistors are the same).

219. Math

A local men's suit manufacturer had 2,742 square meters of fabric to make identical suits, all of the same size. If each suit used 7.4 of fabric, how many suits could be made?

220. Calculus 3

Let u=j+k and v=i+jsqrt2. a) Calculate the length of the projection of v in the u direction. b) Calculate the cosine of the angle between u and v. Your help is very much appreciated!

221. math

Use an x to represent each unknown number. Twice the sum of a number and three.

222. physics

define 1watt of power . a lamp consumes 1000J of electrical energy in 10s calculate its power.

Find the points on y=(-x^2+4x-3)^3 that has a horizontal tangent line.

224. Chemistry

I'm supposed to compare the percent composition of gases in the atmosphere at sea level to the percent composition at high altitude.. Would the percents decrease? I don't really understand

16/4(4)=?

226. Grammar

Do I use to or too in the following sentence? Rita and I are picky who we give compliments to or too?

227. Pre Algebra STill needs help

What is the radius of a circle with the area of 4pi/9?

228. math

3p equals 39 what is the value of p

229. Math

Which of the following is equivalent to x^5 y^2/xy^2 when =/ 0 and y =/ 0 ? (1 point) A.) X^6 Y^5 B.) X^5 Y C.) X^4 Y D.) X^4 I don't even have a good guess. Thank you.

230. science

what is the iupac name of ch tripple bond c single bond ch2 single bond cl

231. Algebra

Find the constant of variation for the quadratic variation. 6y = 4x2 A. 4/9 B. 2/3 C. -2 D. 3/2

rogelio has 3 one-dollar bills, 5 quarters, 4 dimes, 2 nickles and 9 pennies. what fraction of the coins are quarters. A 1/2 B 1/5 c 1/4 D 4/10

233. English

What type of analogy is garbage:smelly and antenna:radio?

234. science

how does the sulfur and iron reaction work?

235. Grammar

Is this correct? My parents and we.

236. math

What is the pressure exerted on the floor by a 2,000N crate with an area of 4m²?

237. math

50 red cars and 30 white and 20 blue what is the probability of 2 cars from the same colors ?

238. math

jackie wrote 5,406,029 in expanded form this way: [5 x 1,000,000] + [4 x 100,000] + [6 x 10,000] + [2 x 10] what two errors did jackie make?

Draw a model to show 84/12=7

240. MATH

in 2005,Eastside elementary school was built at a cost of \$18,000,000.the school it replaced was built in 1935 at the cost of \$180,000.explain how the values of the 8 in each number are related

241. us history

what term decribes the division of government into 3 branches is it separation of powers

242. CHEMISTRY

1. How would you take 1L of an existing solution with a concentration of 1M and use it to make a new solution of 0.1 M? Be specific. 2. Would it be possible to easily create a 2 M solution from 100 mL of 1 M solution? Explain why or why not?

243. english

I have to write a two page assignment onorganization. can you show me an apa format. joann

244. Mechanics & hydromechanics

A uniform 98 N pipe is used as a lever. Where the fulcrum must be placed if a 504 N weight at one end is to balance a 192 N weight at the other end?

245. math

what is annuity?

246. chemistry

Elemental zinc will react with acid to evolve hydrogen gas. This is a redox reaction. Write a balanced molecular equation for the reaction of zinc and hydrochloric acid, showing the coefficents and the phases of all reactants and products. Below is an

247. Math

A music CD has a diameter of 4 inches. What is the radius? Explain your thinking.

248. MATH

in 2005,Eastside elementary school was built at a cost of \$18,000,000.the school it replaced was built in 1935 at the cost of \$180,000.explain how the values of the 8 in each number are related

249. Math

Tom has 1/5 more single dollar bills than Monica. Tom has 1/5 fewer single dollar bills than Elaine. If Monica has \$10 in singles, then Elaine has How many dollars in singles?

1. How many chromosomes do human sex cells have? (1 point) 22 43 46 23 2. The actual genetic makeup of an organism for a particular trait is called the ______. The physical characteristic that trait gives the organisms is called the ______. (1 point)

X

252. physics

A wave travels 750 meters in 5 minutes. Its wavelength is 16.1 meters. What is its period?

253. science

How can I find the physics behind why a wheel moves faster or slower than other wheels? Is this friction?

254. math

Suppose that function f:[0,2]->R is continuous at [0,2], differentiable at (0,2) and such that f(0)=0, f(1)=1 and f(2)=1. a) Show that there is a x1 that belongs to (0,1) such that f'(x1)=1. b) Show that there is a x2 that belongs to (1,2) such that

255. Geometry

Sarah wrote the following 3 numbers as an example of a Pythagorean triple.Is she correct?why or why not? 21,25,35

256. Cosmology

Which of these is NOT a good estimate of the age of the universe? * Decay times of 238U and 232Th in metal-poor stars. * Isochrone fits for globular clusters. * Ages of the faintest white dwarfs. * Ages of the hottest main-sequence stars in distant

257. science

what is the scorpio constellation?

258. Cosmology

The single largest uncertainty in the measurement of the Hubble constant using gravitational lenses comes from uncertainty of... * the distance to the lensing cluster or galaxy. * the mass distribution of the lensed quasar. * the distance to the lensed

259. Cosmology

In the Tully-Fisher relation, the scatter is minimized at which wavelength? * Red * Blue * Infrared * UV

260. Chemistry

Please help, do you have any pointers on how to use linear regression in determining the reaction order

261. Cosmology

As compared to Cepheids, RR Lyrae stars are... * fainter and slower pulsating. * brighter and faster pulsating. * fainter and faster pulsating. * brighter and slower pulsating.

262. math

write 1 2/3 as a fraction?plezzzzzzzzz hellllllllllllllllllllllllllp!!!!!!!!!!!!!!!!!!!

263. Cosmology

In order from earlier to later times, the dominant components of our universe have been: * dark energy, matter, then radiation * dark energy, radiation, then matter * matter, radiation, then dark energy * radiation, matter, then dark energy

264. math ??

what is the 43rd term of -124-122-120

265. Math

Position Term 1 10 2 14 4 22 8 38 n a) Create an expression that represents the term’s value in terms of the position.

266. marh 150 help

simplify 2x^7-9x^7 and 80 dollar shirt 30% off = ? (how do i put this together)

5. Change in the hereditary features of a type of organism over time is ______. (1 point) growth biogenesis spontaneous generation evolution 10. Gregor Mendel discovered some alleles can cover up the presence of others; these alleles are called __________.

268. arithmetic

change 12/23 into a decimal to the nearest hundreth's