# Questions Asked onFebruary 27, 2011

1. ## Calculus

I'm a bit confused about the average equations with integration. I need to solve this problem, and I think I'm supposed to use substitution, but I can't get it to work. The problem looks like this: z(t)=4tsin(t^2), [0,π^1/2] Any input?

2. ## Week 4 COM155

Second, write five sentences in which you address changes in your writing. I'm not exactly sure where to start with this one? The weeks readings were on word use, commonly misused words, and spelling. I'm not asking for any answers I just am not sure what

3. ## Math

Find the perimeter of the cord r=a(1+cos theta)

4. ## chemistry

If 5.00 g of steam (H2O)(g) at 100 C condenses to liquid water (H2O)(l) that is cooled to 50.0 C, how much heat is leberated in calories and kilocalories?

5. ## trigonometry (repost) Mathmate

Use logarithms and the law of tangents to solve the triangle ABC, given that a=21.46 ft, b=46.28 ft, and C=32°28'30" Using the previous values, a=21.46 b=46.28 C=32-28-30=32.475 We have A+B=180-32.475=147.525 a+b=67.74 a-b=-24.82 tan((A+B)/2)=3.433633

7. ## management

what are the 6 COMMUNICATION APPROACHES

8. ## Yr 10 PE

I don't seem to understand this question can you please paraphrase this. Task Outline: Outline the purpose of ONE health promotion initiative related to road safety, assess the effectiveness of this initiative and justify funding for road safety

9. ## ap chem

ok, i'm given: Ethylene Glycol C2H6O2 is the main ingredient in antifreeze. density of pure EG: 1.132 g/mL Anti-freeze is 32% by volume EG I have to find: Volume of Eg in 1 L Mass of Eg in 1 L & the Volume of "solvent" in 1 L Can someone help me? and give

10. ## maths

A floor is covered by 800 tiles measuring 10 cm square.How many square tiles of side 8 cm would be needed to cover the same floor?

11. ## maths

the distance from hertford to st albans is 32 km. how far apart will they be on a map of scale 1:50000?

12. ## maths

1) The 17th hole at the famous st andrews golf course is 420 m in length.How long will it appear on a plan of the course of scale 1:8000? 2) On a map of scale 1:15000,the distance between the buckingham palace and brixton underground station is 31.4cm.

13. ## Geometric

1) The sum of last three terms of GP having n terms is 1024 time the sume of first 3 terms of GP. If 3rd term is 5. Find the last term. 2) The sum of the first eight terms of a GP is five times the sum of the first four terms. Find the common ratio.

14. ## Permutation

In how many ways can 5 boys and 5 girls be seated around a table so that no 2 boys are adjacent?

How to press the value of log, to evaluate log, to find the unknown log using EL-531WH, advance D.A.L

16. ## math

Insert 3 numbers between15 to 17 such that the terms from an Arithmetic progression

17. ## math

if x,y,z represents consecutive terms in an Arithmetic progression, prove that y is = (x+z)/2

18. ## cosines

I don't know how to reverse cosine decimals into angles. Can you please explain and help me solve these . cos A= 0.28571428571 A= cos B= 0.66666666667 B= cos C= 0.5238089523

19. ## science

I need urgent help. Use two diagrams of amnomia molecules to indicate the inter- and intramolecular force

20. ## science

Differentiate between intermolecular and intramolecular forces

61. ## Math

Could someone please help me to identify what type of misrepresentation or misuse have demonstrated by the statement below. Here are choices only one of them connects with this statement: Which one? “…male children born to women who smoke during

62. ## maths

Make k the subject of the following two equations. 1) 8k+2=3(4k+t) 2)7k+11t=5-9kt

63. ## Chemistry

Decomp. of H2O2 with Catalase.I am trying to use the Arrhenius equation in my coursework, but i am struggling to get it to work. I have substituted most of the information in, such as activation energy(23000J), and gas constant(8.314x10-3) etc. The issue

64. ## Math

A stick 80 centimeters long makes a shadow that is 50 centimeters long. At the same time of the day, the shadow of the tower is 25 meters long. How high is the tower?

65. ## energy

one litre of liquid methanol will occupy how much volume in the state of vapour at 60 deg. Celsius?

66. ## math

integration of cot^4(1-2x)dx

67. ## Science

What minimum acceleration must it engines produce if the airoplane has become airbome after starting from rest and travelling a distance of 300m on the runway

99. ## math

-1+(3)(-1)(4)+2=

100. ## math-calc

function f(x)=3x^2-2x-1 find equation of the line that is tangent and parallel to 8x-2y+12=0

101. ## math-calc

derivate of 2sin(x)-cos(x)-cot(x)

102. ## math-calc

find third derivate f(x)=x/x+1

103. ## Physics 102 (College)

A few homework problems. 1) The temp of a monotomic ideal gas remains constant (isothermic) during a process in which 4250 J of heat flows out of gas. How much work is done? Pos/neg? delta T = 0 and delta U = 0 by inference Q = 4250 U = 3/2 nRT Thanks for

104. ## math

an unbiased coin is tossed 3 times. find the probability that the coin lands heads exactly once.

105. ## potential energy

An ideal spring has a spring constant k = 20.0 N/m. What is the amount of work that must be done to stretch the spring 0.70 m from its relaxed length?

106. ## math

integration of x^2 * cos^2(x)

107. ## physical science

how gravitational acceleration is used to benefit mankind and the environment.how can rural people also benefit from the use of gravitational acceleration?

108. ## Calculus

Prove that (2,0) is the closest point on the curve x^2 + y^2 = 4 on (4,0.

109. ## chemistry

The simple rule “Like dissolves like” is often used to describe the solubility of a substance in different solvents. Write a short paragraph discussing your evidence for this rule. Include in your discussion where you think this rule works best and

110. ## AP and GP

1) Given the terms a35 = 1238, a70 = 1483 of an AP. Find the exact value of the term a105 a sequence, and sum of sequence. 2) Given the term a3 = 99 and a5 = 891 of GP. Find the exact value of the term a7 of the sequence and the sum of sequence.

111. ## science

what could you infer about the area where you find pecten fossils?

112. ## Arithmetic

Given that 3, b, c and 18 are an AP. Find the value of b and c.

113. ## algebra

Find the number of square units in the area of the region in the first quadrant which is bounded by x = 4, the y-axis, y = 2, and y = 8.

114. ## math

ms.pritchard wrote the following inequality on the board 5.6 with the sign greater on equal to then negative fourteen what should be the solution set for the inequality

115. ## Ap Chemistry

explain the difference in boiling points of acetone and 1 proponol. (proponol higher) also explain the difference in water solubility of chloroethane and acetone. (acetone is soluble but not chloroethane)

116. ## management

what are the difference between them.. Democratic Group Authoritative Group Consultative Group Participative Group

117. ## CHEMISTRY

Consider the reaction shown below. 4 PH3(g) P4(g) + 6 H2(g) If, in a certain experiment, over a specific time period, 0.0061 mol PH3 is consumed in a 1.9-L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?

118. ## Math

how to multiply amd simplify of -8/63 x 21/32 x -9/42 = Pleas show work or give examples of simular problems

119. ## Physics 102 (College)

I'm stuck on part B of this question: A system does 125 J of work on environment and gains 79 J of heat in the process. Find change in internal energy (delta U, abbreviated dU)of a. the system and b. the environment. A. Find dU of the system W = 125 J Q =

120. ## math

Four balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white. (Round your answer to three decimal places.)

121. ## math

A druggist wishes to select three brands of aspirin to sell in his store. He has five major brands to choose from: A, B, C, D and E. If he selects the three brands at random, what is the probability that he will select the following? (a) brand B (b) brands

122. ## Biochem - Diabetes

Type 1 diabetic injected insufficient insulin so her body can’t use glucose in blood. Blood glucose is 38 mM (normal value = 3.3-5.8 mM). To adjust osmolality, she increased urine output = dehydration. Should she be treated with water? The answer is NO

123. ## chemristy

How many mL of 8.0 M HCl must you dilute with an appropriate volume of H2O to prepare a total volume of 260.0 mL of 1.5 M HCl?

124. ## Laws of Motion

Two skaters are in the exact center of a circular frozen pond. Skater 1 pushes skater 2 off with a force of 100 N for 1.4 seconds. If skater 1 has a mass of 30 kg and skater 2 has a mass of 74 kg, a) what is the relative velocity (v1 - v2) after the push

125. ## Physics 102 (College)

I'm stuck on part B of this question: A system does 125 J of work on environment and gains 79 J of heat in the process. Find change in internal energy (delta U, abbreviated dU)of a. the system and b. the environment. A. Find dU of the system W = 125 J Q =

126. ## Laws of Motion

A student stands on a scale in an elevator that is accelerating at 2.8m/s^2. If the student has a mass of 94 kg, to the nearest newton what is the scale reading?

127. ## Algebra

The five-digit number 31d26 ----- is divisible by 3. Find the sum of all possible values of d.

128. ## Math

1. 3+2+1=1+2+3 2. 3(1+4)=(3x1)+(3X4) 3. 9(5+6)=45+54 4. 9+(4+3)=(4+3)+9 5. (9+7)+6=9+(7+6) 6. 5(a+7)=5a+35 A. Associative Prop. of Addition B. Associative Prop. of Multiplication C. Commutative Prop. of Addition D. Commutative Prop. of Multiplication E.

129. ## Physics

If you tried to smuggle gold bricks by filling your backpack, whose dimensions are 55cm* 30cm *16cm , what would its mass be?

130. ## Chemistry

Copper (II) fluoride contains 37.42%by mass. Calculate the mass of fluorine(in grams)contained in 55.5 g of Copper(II) Fluoride.

131. ## Chemistry

Calculate the molarity of 15.4 g of ethanol (C12H22O11) in 71.0 mL of solution

132. ## science

A 60.0-mL 0.508 M glucose (C6H12O6) solution is mixed with 115.0 mL of 2.43 M glucose solution. What is the concentration of the final solution? Assume the volumes are additive.

133. ## Math

A 5 feet long ladder leans against a wall and makes an angle of 65 degrees with the ground. find, to the nearest tenth of a foot, the distance from the wall to the base of the ladder.

134. ## Statistics and Probability

Suppose a basketball player successfully makes 70% of the free throw shots they attempt. Let X represent the number of successful attempts in 120 independent attempted free throws. (A) What is the true probability distribution of X? (B) Find the mean and

135. ## calculus

find the area of each circle. use 22 over 7 for pie. and radis for 15 in.

136. ## Math

Consider the region defined by the inequalities: 0≤x 0≤y -21/4≤y-7/4x y+x≤7 4≤y-3/7x Pick up those points which are the boundary points of the resulting convex region.

137. ## Chemistry

The Ka value for ethanoic acid is 1.8x10^-5, what would be the pH of a 2.0x10^-2 M solution of ethanoic acid?

138. ## Physics

Part 1 You are a pirate working for Dread Pirate Roberts. You are in charge of a cannon that exerts a force 10000 N on a cannon ball while the ball is in the barrel of the cannon. The length of the cannon barrel is 2.47 m and the cannon is aimed at a

139. ## Physics

part 1 A 1760 kg car accelerates uniformly from rest to 8.8 m/s in 4.52 s. Find the work done on the car in this time. Answer in units of J. part 2 Find the average power delivered by the engine in the first 1.808 s. Answer in units of W. part 3 Find the

140. ## Chemistry

The Ka value for ethanoic acid is 1.8x10^-5, what would be the pH of a 2.0x10^-2 M solution of ethanoic acid?

141. ## chemistry

In a reaction involving the bromination of acetone, the following initial concentraions were present in the reaction mixture. acetone (0.8mol/L), H+ (0.2 mol/L), Br2 (0.004 mol/L) At 25 degrees C, it took 240s before the colour of Br2 disappeared. If the

142. ## chemistry

how many grams of NaCl (molecular weight 58.5) should be used to prepare 20 liters of a solution containing 154mEq/L?

143. ## statistics

The population of SAT scores forms a normal distribution with a mean of µ =500 and a standard deviation of Ïƒ =100. If the average SAT score calculated for a sample of n = 25 students, a. What is the probability that the sample mean will be greater than

144. ## Physics

part 1 A 1760 kg car accelerates uniformly from rest to 8.8 m/s in 4.52 s. Find the work done on the car in this time. Answer in units of J. part 2 Find the average power delivered by the engine in the first 1.808 s. Answer in units of W. part 3 Find the

145. ## Anthropology

1) I have to give out an example of how dogs have evolved, but I don't know any. 2) How has Dr. Francine Patterson's research helped the plight of all animals?

146. ## Physics

Part 1 You are a pirate working for Dread Pirate Roberts. You are in charge of a cannon that exerts a force 10000 N on a cannon ball while the ball is in the barrel of the cannon. The length of the cannon barrel is 2.47 m and the cannon is aimed at a

147. ## english

in tragedy vocabulary. I need the word for the following definition. a device where by the audience or reader understands more of a situation or of what is being said than a character is aware of.

148. ## chemistry

why might you not observe a reaction even though an activity series indicates it should occur?

149. ## geometry

To the nearest tenth of a foot, what distance (x) from the building should Tim place the 16 ft ladder so that the top of the ladder will be 12 feet above the ground.

150. ## English

I need the vocab word for the following definiton: Unrealistic devices or procedures that the audience agrees to accept (ex: aside).

151. ## Stoichiometry Problems

How many grams of phosphorus can be obtained from the decomposition pf 45kg of POCL3. 2 POCL3 --(> 2P + 3Cl2 + O2

152. ## socials

some examples of ads using play on words

153. ## chemistry

For each titration of a buffer, how do i calculate how many mLs of titrant were required to obtain a 1.00 pH unit change from the initial pH?

154. ## Chemistry

If I have 6 mol of N2 and 12 mol of H2 to yeild ammonia, which chemical is in excess and by how much?

155. ## biology

in what categorize does Esctacy belong to? carbohydrate, lipid, protein or nucleic acid and why. can some give me 2 or 3 exaple why is belogs to it thank you in advenge

156. ## Cheistry

When acetone is added to saturated sodium chloride, the equilibrium shifts toward the right. What is the role of acetone in shifting the equilibrium toward the right? any help would be appreciated. My TA is of no use in explaining our lab experiments.

157. ## capital budgeting

Retained earning is a free source of funds to the company. Therefore, we can ignore retained earnings when computing the cost of capital. Do you agree or disagree with this statement?

158. ## calc

Can someone please show me how to find the integral of sin squared x?

159. ## chemistry

When acetone is added to saturated sodium chloride, the equilibrium shifts toward the right. What is the role of acetone in shifting the equilibrium toward the right? any help would be appreciated. My TA is of no use in explaining our lab experiments.

160. ## physics

A phonograph record has an initial angular speed of 37 rev/min. The record slows to 10rev/min in 1.3 s. What is the record’s average angular acceleration during this time interval

161. ## College Algebra

need help in solving how many miles can i drive on 60 gallons of gas, with the Mpg 30 in the city, and 42 highway. I would like all the steps, never had algebra before, so i am very lost.

162. ## physics

A 3.00 kg block starts from rest at the top of a 36.0'> incline and slides 2.00 m down the incline in 1.60 s. (a) Find the acceleration of the block. m/s2 (b) Find the coefficient of kinetic friction between the block and the incline. (c) Find the

163. ## chemisrty

calculate the percent by mass of carbon(c) in the amino acid arginine,C6H16N4.

164. ## physics

A 3.00 kg block starts from rest at the top of a 36.0'> incline and slides 2.00 m down the incline in 1.60 s. (a) Find the acceleration of the block. m/s2 (b) Find the coefficient of kinetic friction between the block and the incline. (c) Find the

165. ## probability

Four balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white

166. ## statistics

A company decides to investigate the amount of sick leave taken by its employees. A sample of seven employees yields the following numbers of days of sick leave taken in the past. 0, 1, 4, 1,6, 2. Find and interpret the range

167. ## science

what is the answer to the problem .003m = mm?

168. ## geometry (high school)

if there are two tangent circles that have two external tangent lines that intersect at a 60 degree angle, what is the ratio of the radii.

169. ## trig

if cos(pi/4) is sqrt2/2 i thought sec(pi/4) is 2/sqrt 2,but its just sqrt 2 . can some one please explain.

170. ## college algebra

If an average-size man with a parachute jumps from an airplane, he will fall 12.5(0.2t - 1) + 19t feet in t seconds. How long will it take him to fall 134 feet?

171. ## college algebra

Find the maximum value of 5x + 7 – x2 on the horizontal span of 0 to 5. (Enter the maximum value of the expression, not the value of x at that point.)

172. ## science

how do i figure out the science metric conversion of .003 m = mm?

173. ## Writing

okay i have this writing assignment on how drunk driving can be stopped .. i have like three sentences to complete it and these three sentences are to explain how/what harsher penalties can help in stopping drunk driving.. I'm stuck because the following

My teacher wants me to calculate the rate of enzyme activity (1/s) I'm given the temperatures: 0 , 15, 30, ,50, and 80 (degrees celsius) AND the times 8.74, 18.83, 14.30, 34.22, and infinity (seconds obviously, these are the times it took the enzyme to

175. ## algebra

Given that XY =21 and 1 < x < 2, find the sum of the upper and lower bounds of Y. Express your answer as a decimal.

176. ## algebra

Graph the following equation: clculte the slope, x-intercept, and y-intercept, and label the the intercelts on the graph. problem: Find an equationin slope-intercept form passing through the points (2,5) and ( 7,-3).

I don't know where to start with it? A tube is set up for radioimmunoassay containing antibody with a capacity for binding 1ug antigen. Both labelled (50,000 counts per ug) and unlabelled antigen are added to the tube. Work out a formula to calculate the

178. ## math (algebra honors)

The edge of one cube is 2 cm shorter than the edge of a second cube. The volumes of the two cubes differ by 386 cm^3. Find the edge of the smaller cube using factoring.

179. ## math

A cabaret show is put together by a manager who wishes to present two comedians and three singers. He can choose from 16 comedians and 17 singers. In how many ways can he select the acts for the show?

180. ## math (algebra honors) #2

If the radius of a circle is increased by 6 cm, the new area is 121 (pi) cm^2. Find the radius of the original border using factoring.

181. ## physics

A mesquito whistles a note of 300 Hz, and flies towards you at a speed of 30 m/s. The air temprature is 20 degrees celcius. Before doing any calculations, determine wether you will observe a note that is greater, less than, or equal to 300 Hz (I have

182. ## math

A restaurant offers an "appetizer-plate special" consisting of six selections from its list of appetizers. If there are more than 8000 different possible appetizer-plate specials, what is the least possible number of appetizers?

183. ## physics

A 3.00 kg block starts from rest at the top of a 36.0'> incline and slides 2.00 m down the incline in 1.60 s. (a) Find the acceleration of the block. m/s2 (b) Find the coefficient of kinetic friction between the block and the incline. (c) Find the

184. ## algebra

Graph the following equation: clculte the slope, x-intercept, and y-intercept, and label the the intercelts on the graph. problem: Find an equationin slope-intercept form passing through the points (2,5) and ( 7,-3). (2+5)/(7+ -3) = 7/4 so y = (7/4)x +b

185. ## Biology

how does esctacy work plz i need 3 explanation

186. ## Physics

How much work is needed to lift a 3 kg mass a distance of 0.75 m?

187. ## math

half of a gallon is a half gallon. half of a half gallon is a quart. half of a quart is a pint. half of a pint is a cup. a cup is what fraction of a quart? Is the answer 1/4?

188. ## Math

Construct a truth table for ~q^p

189. ## Physics

An arrow is fired vertically upwards by a bow and reaches an altitude of 134 m. Find the initial speed of the arrow on the ground level.

190. ## Physics

A student uses a spring to launch a marble vertically in the air. The mass of the marble is 0.002 kg and when the spring is stretched 0.05 m it exerts a force of 10 N. What is the maximum height the marble can reach?

191. ## Physics

A children’s roller coaster is released from the top of a track. If its maximum speed at ground level is 8 m/s, find the height it was released from.

192. ## Physics

A student uses a spring with a spring constant of 130 N/m in his projectile apparatus. When 56 J of potential energy is required to launch the projectile to a certain height, what is the compression in the spring?

193. ## Chemistry

The pH of a 0.065 M solution of a weak base is 11.70. What is the value of Kb for this base?

194. ## Physics

How much work must be done to accelerate an 8x105 kg train: a) from 10 m/s to 15 m/s; b) from 15 m/s to 20 m/s; c) to a stop an initial speed of 20 m/s?

195. ## Chemistry

If each of the salts listed in A through E were dissolved in water to make a 0.1 M solution, which solution would have the lowest pH? a. NaNO2 b. NaF c. AlCl3 d. KNO3 e. Na3PO4

196. ## Chemistry

Which one of the following pairs of reactants would react together in a Lewis Acid/Lewis Base reaction? a. KOH and HNO2 b. NaOH and HCl c. CH3COOH and HF d. Ag+ and NH3 e. HClO and NH3

197. ## Physics

How much work is done in accelerating a 2000 kg car from rest to a speed of 30 m/s?

198. ## Chemistry

Calculate the concentration of all species in a 0.15 M KF solution. Ka = 6.4 x 10-4 for HF.

199. ## Physics

A rock is dropped from a height of 2.7 m. How fast is it going when it hits the ground?

200. ## Chemistry

Calculate the pH of a solution that results from the mixture of 50.0 mL of 0.15 M HCOOH with 75.0 mL of 0.13 M HCOONa. Now, don't forget these solutions are being mixed and you haven't accounted for that yet in the concentrations! Ka for HCOOH is 1.8 x

201. ## Chemistry

Consider the titration of a 35.0-mL sample of 0.175 M HBr with 0.200 M KOH. Determine the pH after adding 5.0 mL of base beyond the equivalence point.

202. ## algebra

how do you solve 140 s + 120 p = 1540 if your trying to figure out how many cups of juice there is for strawberry and pineapple if it has 120 calories & the strawberry one only has 140 ?

203. ## science

A ball is thrown horizontally from a cliff a 8 m/s. How fast is it moving 2 s later?

204. ## Statistics

To determine whether themean nicotine content of a brand of cigarettes is greater than the advertised value of 1.4 milligrams, a health advocacy program tests: Ho: mu = 1.4 Ha: mu > 1.4 The calculated value of the test statistic is z = 2.42. ==> How do I

205. ## social studies

were the british justified using that amount of force against the french in 1837? use examples from 2011 to help explain your answer

206. ## math

how do you do capacity using only gallos

207. ## Calculus

Volume problem: y=x^3, x=y^3; rotated about x-axis I first made y=x^1/3, then x^3=x^1/3 Then I tried to do an integration from 0 to 1 with x^1/3-x^3, but I can't get one of the possible answers, which are: A. 16/35π B. 16/7π C. 18/35 D. 7/2 E. 16π Any

208. ## calculus

Calculate the derivative indicated. y '(25), y = ãx + 2 x

Determine the values of a M and N , so that the polynomial 2x^3+mx^2+nx-3 and X^3-3mx^2+2nx+4 are both divisible by x-2. I am so lost, i do not know how to start this problem! please help i have a test soon!

210. ## Physics

Suppose a motorcycle with uniform motion travels from a position of 5.0km[S] to a position of 20.0km[N] in 0.5h Find the motorcycle's A) displacement B) velocity C) Distance Travelled D) speed.

211. ## geometry

A board that is 12 feet long must be cut into 2 pieces that have lengths in a ratio of 3 to 2. Find the lengths of the two pieces.

212. ## math

a midwestern music competition awarded 32 ribbons. the number of blue ribbons awarded was 3 less than the number of white ribbons. the number of red ribbons was 2 more than the number of white ribbons. how many of each kind of ribbon was awarded?

213. ## Chemistry

you have75.0ml of 2.5 M Solution of Na2CrO4(aq). You also have 125ml of a 1.74M solution of AgNO3(aq)Calculate the concentration of NO3 when the two solutions are added together

214. ## Math

How do you find the turning point of a quadratic equation? (The Formula)

215. ## Dynamics

A boy of mass m takes a running start and jumps on his sled at position 1. He leaves the ground at position 2 and lands in deep snow at a distance of b = 25 ft. How fast was he going at position 1?

216. ## History

The Inuit people of North America are all _______________

217. ## History

What did people in the House of Tudor do?

218. ## Physics

Physics question on identify the reaction? I am having trouble with the question a, b, and c in this physics problem: One or more external forces are exerted on each object enclosed in a dashed box shown in the figure below. Identify the reaction to each

219. ## chem

seawater contains approximately 3.5% NaCl by mass and has a density of 1.02 g/mL. What volume of seawater contains 1.0 g of sodium?

220. ## Calculus

Let f(x)= (1/x). Use the limit definition of derivative to find f'(x). My professor's answer is: -1/x but I keep getting: -1/x^2 what do I have to do to get that answer?

221. ## Geometry

The date December 31, 2043 can be written in the format 12/31/43. This is an example of a true mathematical statement because 12 + 31 = 43. Suppose I wanted to write dates in the 21st century for Valentine’s Day (which is always celebrated on February

222. ## Physics

Suppose a motorcycle with uniform motion travels from a position of 5.0km[S] to a position of 20.0km[N] in 0.5h Find the motorcycle's A) displacement B) velocity C) Distance Travelled D) speed.

230. ## Science

Officials have found certain amounts of hazardous Fe3+ ions in the town of Scienceville's water supply. Using your knowledge of chemical reactions, suggest a way to eliminate this ion from Sciencevills's drinking water supply. Provide a thorough

231. ## Math

If X=11 inches, Y=8 inches, and Z=6 inches, what is the area of the parallelogram above?

232. ## math

give exact and approximate solutions to three decimal places y^2-12y+36=4

233. ## algebra

solve using the elimination method x+7y=58 -x+4y=30

234. ## college

At which point in the criminal process does the right to counsel end?

235. ## math

Please help me... How do I express the following products in scientific notation?? 1)(2.964 x 10^8) divided by (52 x 10^2) 2)(24.5 x 10 ^ negative 8) divided by (3x10^2) 3)(8.1 x 10^ negative 9) x (4 x 10^2)?

236. ## geometry

for that some problem: A board that is 12 feet long must be cut into 2 pieces that have lengths in a ratio of 3 to 2. Find the lengths of the two pieces. arn't you solving two parts because the board was cut in two?

238. ## math

what is the area of the region enclosed by the graphs of y=2- lx-3l and y= x^2-2x?

239. ## Algebra 1B

How do I solve \sqrt{\frac{33xy^{3}}{\sqrt{3x}}}? I am getting so confused and I need help please!

An m = 6.80-kg clay ball is thrown directly against a perpendicular brick wall at a velocity of 22.0 m/s and shatters into three pieces, which all fly backward, as shown in the figure. The wall exerts a force on the ball of 2670 N for 0.110 s. One piece of

241. ## geometrY

to estimate the height of a tree, Dave stands in the shadow of the tree so that his shadow and the tree's shadow end at the same point. Dave is 6 feet 4 inches tall and his shadow is 15 feet long. If he is standing 66 feet away from the tree, what is the

242. ## 2 balloons and a doubled distance (physics)

EARLIER SOMEONE POSTED: "Two like-charged balloons, placed at a distance of .5 meters, experience a repulsive force of .32 N. What is the force if the distance between the two balloons is doubled? If you use Coulomb's Law, the equation used to find .32 N

243. ## gr. 12 biology

My teacher wants me to calculate the rate of enzyme activity (1/s) I'm given the temperatures: 0 , 15, 30, ,50, and 80 (degrees celsius) AND the times 8.74, 18.83, 14.30, 34.22, and infinity respectively (seconds obviously, these are the times it took the

244. ## Math

If class starts at 11:50 and lasts 1 hour 40 min how do you write a math equation?

245. ## Math(Urgent)

Differentiate. g(x)=(x^3+1)(3x^2-1) I know that the answer is 15x^4-3x^2+6x but I donot know how to get to this. I was using g'(x) X h(x) + g(x) X h'(x) and I was using the derivatives 3x^2 and 6x but I guess this is wrong. Please help!! Thank you.

246. ## algebra

A rectangular sheet of aluminum foil is 50 centimeters long and 20 centimeters wide, and weighs 5.4 grams. Find the thickness of the aluminum foil in centimeters.

247. ## Biology

in what categorize does Esctacy belong to? carbohydrate, lipid, protein or nucleic acid and why. can some give me 2 or 3 exaple why is belogs to it thank you in advenge

248. ## HCS/335

can someone help me find a current article relating to this thank you!! Find a current administrative issue in a newspaper, magazine, or journal article relating to topics such as patient privacy, confidentiality, or HIPAA Write a 1,050- to 1,400-word

249. ## pre ap physics

** When s conducting sphere is charged positively, initially the charge is deposited on the left side. However, due to the sphere's conducting nature, the charge spreads uniformly throughout the surface of the sphere. Charge is uniformly distributed

250. ## history

Discuss one example of cultural, economic, or environmental diffusion between your chosen society and another society, either from this list or of your choosing. • Mesopotamia • Indus River Valley • Yellow River Valley • Egypt • Ancient South

251. ## Chemistry

Please check my answers. 1. Using the equations, IO3- +5I- + 6H+ -> 3I2 + 3H2O C6H8O6 + I2 -> C6H6O6 + 2I- + 2H+ how many equivalents of IO3- are required to produce enough I2 to oxidize one equivalent of ascorbic acid? Answer: 1IO3- 3I2 3C6H8O6 1/3

252. ## Chemistry

Calculate the mass of silver metal (Ag) produced from the reaction of 5.58 grams of copper metal (Cu) according to the following reaction: Cu(s) + 2AgNO3(aq) --> Cu(NO3)2(aq) + 2Ag(s)

Determine the values of a M and N , so that the polynomial 2x^3+mx^2+nx-3 and X^3-3mx^2+2nx+4 are both divisible by x-2. I am so lost, i do not know how to start this problem! please help i have a test soon!

254. ## Physics

In an experiment using sodium light (λ=589 nm), the slits are 1.2 μm wide. You notice that every fourth fringes missing. a) What is the slit separation? b) How many fringes appear on the screen?

255. ## Math

The number of calls received by a car towing service averages 14.4 per day (per 24 hour period). After finding the mean number of calls per hour, find the probability that in a randomly selected hour the number of calls is 0

256. ## Physics

I just need ideas on how i can estimate the height of a building by using only a tennis ball and a stop watch. I can only measure it by being on the ground level.

257. ## math

fixed installment loan of $13,500 with 60 months to pay back, monthly payments of$280.24. instead of making 36th payment, pays remaining balance on loan. how much interest saved? use acturial method u= n*p*v/100+v

258. ## physics- still confused.

A positively charged light metal ball is suspended between two oppositely charged metal plates on an insulating thread as shown below. After being charged once, the plates are disconnected from the battery. Describe the behavior of the ball. Thank you so

259. ## calculus

Find an equation of the tangent line to the curve at the given point. y = 7 sec x P = (π/3, 14)

260. ## Math

1. 4+7=7+4 2. 9+5+3=3+5+9 3. 5(7+1)=35+3 4. (1+2)+3=1+(2+3) 5. 6(a-3)=6a-18 6. (9+5)+4=5+(4+9) A. Associative Prop of Addition B. Associative Prop of Multiplication C. Commutative Prop of Addition D. Commutative Prop of Multiplication E. Distributive Prop

261. ## Calculus AB

Find the indefinite Integral of: (e^(2x)-e^(-2x))/(e^(2x)+e^(-2x))dx Thank you very much for your help.

262. ## algebra

Find the number of square units in the area of the region in the first quadrant which is bounded by x = 4, the y-axis, y = 2 , and y = 8.

263. ## art

he is a artist I am at work, and have done much, but I wish I had eight pairs of hands and another body to shoot the specimens.

asked by love of this country
264. ## physics

A charge of .250 C moves vertically in a field of .500 T that is oriented some angle from the vertical. If the charges's speed is 2.0 x 10 ^2 m/s, what angle(s) will ensure that the force acting on the charge is 5.0 N?

265. ## physics

A charge of .250 C moves vertically in a field of .500 T that is oriented some angle from the vertical. If the charges's speed is 2.0 x 10 ^2 m/s, what angle(s) will ensure that the force acting on the charge is 5.0 N?

266. ## chemistry

Commercial breathalyzers contain .75 mg of K2Cr2O7, 1.5 mL of H20 and 1.5 mL of H2SO4. What is the concentraion of the dichromate in the solution?(the acid is a solvent) don't want answer just want to know how to work it out.

267. ## English

Is "after the hurricane" a pharase or clause?

268. ## Chemistry

Please help me with these! Thanks :) Describe, in detail, how to make 5.5 liters of a 2.5 molar HCl solution from a 10.5 molar HCl stock solution. How many grams of a stock solution that is 85.5 percent H2SO4 by mass would be needed to make 150 grams of a

269. ## Chemistry - physical, chemical and nuclear process

A healthy human body maintains a temperature of about 37.00C. Explain how physical, chemical and nuclear processes all contribute, directly or indirectly, to keeping the human body at a constant temperature.

270. ## Math(Urgent)

Compute the maximum product for two positive numbers x and y with the property that the sum of the first plus five times the second is 5000. 1) Indicate the objective equation 2) Indicate the constraint equation I put x+5y=5000. Is this correct.

271. ## math

Write an expression for the sum of the squares of two consecutive integers. (Use x for the integer.) 1 Simplify that expression. 2

272. ## English

After we did two types of sand together, he did the rest on his own. or After we had done two types of sand together, he did the rest on his own. Which one is correct?

273. ## gr. 12 biology

My teacher wants me to calculate the rate of enzyme activity (1/s) I'm given the temperatures: 0 , 15, 30, ,50, and 80 (degrees celsius) AND the times 8.74, 18.83, 14.30, 34.22, and infinity respectively (seconds obviously, these are the times it took the

320. ## English

Please help Correct punctuation and spelling only. Thanks! We have received medical information from Midvale Clinic, and copies of all the documents we received are enclosed. We received nothing from Dr. Best, and the only items we received from Dr.

321. ## english

Please Help correct punctuation & spelling! Thank you! I tried to call you about the above case, but learned that you were out of town and will not return until Wednesday. You wrote to me on June 1 to ask what authority I had or could get to settle this

322. ## Chemistry

Why is it desirable in the method of back-titration to have a considerable amount(more than 10mL) of acid added in excess?

323. ## math quick question

Hi! Thank you for your help~~ What is the absolute value of (3x - 6)^2 ? (i am trying to use this to find the radius of convergence of a power series by the way)..

324. ## English

In an entry dated July 15, 1944, Anne writes the following: …in spite of everything I still believe that people are really good at heart. I simply can’t build my hopes on a foundation consisting of confusion, misery, and death. I see the world

325. ## chemistry

How would the % of Fe determined be affected if the unknowns had not been dried and had contained adsorbed water in the titration?

326. ## Math

A storage box measure 24in by 12in by 3in. Find its volume to the nearest cubic meter (1in =2.54cm)

The coefficient of kinetic friction between a suitcase and the floor is 0.26. If the suitcase has a mass of 70.0 {kg}, how far can it be pushed across the level floor with 680 {J} of work?

328. ## chem

The volume of an adult's stomach ranges from about 50 mL when empty to 1 L when full.If its volume is 500 mL and its contents have a pH of 2, how many moles of H+ does it contain?

329. ## english

Please correct punctuation and spelling errors. Thank you! We have an appointment with Representative Howard at 1:30 p.m. on Tuesday, August 1, in Room 209 at the Capitol in Nashville. Our appointment will precede the General Committee meeting in room 7 of

330. ## English

Punctuation Correction please! As we have discussed, the Spanish Club wants to sponsor a summer study trip to Spain. If our initial surveys are correct, the number of students wishing to participate in the summer study group will exceed 15.

331. ## Mathematics

Hello, what is the absolute value of ((3x-2)^2) ? I know normally, if this was 3x-2, you would do -1

332. ## english

Punctuation Correction please! At the present time, the Spanish instructor Joseph Diaz has agreed to assume the major responsibility for the final arrangements. Karen McGraw, president of the Instructor’s Council and her husband have agreed to accompany

333. ## math

A rectangle is 4 inches wide by 7 inches long. When the length and width are increased by the same amount, the area is incresed by 26 square inches. What are the dimensions of the new rectangle?

334. ## English

Correct Punctuation, please. As you know, the students will be staying in private homes in the city while studying and touring. Mr. Diaz is preparing a detailed report of the trip plans, and will submit it to you within the next few days.

335. ## English

Correct punctuation, please. The students will be able to receive mail through the American Consul in the city, and any emergency messages should be directed to the office of the American Consul. Since several short excursions are planned to visit the site

336. ## phsyics

Light enters a plate of borosilicate crown glass at an angle of 40.2 degrees  with respect to the nor- mal to the air-glass surface. If the index of refraction of the glass is 1.52, find the angle made by the refracted beam with the normal. Answer in

337. ## English

Correct punctuation, please. Attached is a list of guiding principles drawn up by the Spanish Club Council for the students to follow while in Spain. We appreciate your support and we will keep you informed of the progress of our plans for the Spain summer

338. ## geog

what heat engine transfers heat energy from the tropics to the poles?

339. ## Calc: Difference quotients

"Use difference quotients with delta(x)=0.1 and delta(y)=0.1 to estimate fx(1,3) and fy(1,3) where f(x,y)=e^(-x)sin(y)." I don't know how to solve this problem. Could someone walk me through it? Thank you so much!

340. ## Math

A pipe has an outside diameter of 1.25 inches and an inside diameter of 0.75 inches. If Kelly hacksaws the pipe in two, what fraction of the pipe cross sectional area is sawn when the blade breaks through to the inside?

"Find the gradient of the given function: z = xe^(y). Assume the variables are restricted to a domain on which the function is defined." Thanks for the help!

342. ## Finding gradient at a given point

"Find the gradient f(x,y)= x^(2)*y + 7xy^(3) at (1,2)." Thank you!

343. ## Directional derivative

"Find the directional derivative fu(1,2) for the function f with u = (3i-4j)/5 for f(x,y)= x^(2) - y^(2)." Thank you!

344. ## Calc

The question that I'm stuck on is this: "Let f(x,y)= x^(2)*ln(y). Find the average rage of change of f as you go from (3,1) to (1,2) and find the instantaneous rate of change of f as you leave the point (3,1) toward (2,1)." Any help would be appreciated.

345. ## Calc

The directional derivative of z = f(x,y) at (2,1) in the direction toward the point (1,3) is -2/sqrt(5), and the directional derivative in the direction toward the point (5,5) is 1. Compute dz/dx and dz/dy at (2,1). I have no idea how to solve this

346. ## math

if x=f and f is 13 what is t

347. ## math

Solve the following system of linear equations by graphing. (If the system has no solution, enter NONE for each answer. If the system is dependent, enter INFINITELY MANY for each answer.) 7x+2y=0 2x-7y=0 x = y =

348. ## Calc

The temperature at any point in the plane is given by function f(x,y) = 100/(x^(2)+y^(2)+1). Find a direction at the point (3,2) in which the temperature does not increase or decrease. Help, please? Thank you.

349. ## Math

If a person was locked in a perfectly insulated room 8ft by 8ft by 10ft, how long would it take the room temperature to increase from 75 degree Farenheit to 100 degree Farenheit? The density of air is 1.2 Kg/Cubic meter and 1 watt sec is its specific heat.

350. ## algebra 2

Factor completely 6r^2+13rd+6b^2. Thank you.

351. ## Math

This problem deals with TRADE & CASH DISCOUNTS. PLEASE HELP solving some questions. Here is some information in regards to the questions. THANK YOU! Misuse and abuse of trade discounts infringe on fair trade laws and can cost companies stiff fines and

352. ## calculus

consider a point on a circle x2+y2=1.At what rate Y is changing with respect to X when the point is at X=1/2....

The Great Gatsby Movie Discussion Questions? Compare and contrast Gatsby's social class with that of Tom and Daisy Buchanan. How does geography contribute to the definintion of social class in The Great Gatsby? What part of his past is Gatsby trying to

354. ## us history

what is your opinion on if the united states should have became isolated after the cold war to maintain peace

355. ## equation

For the following linear inequalities draw the feasibile region i: x _>1 ii: x+y _

356. ## Chemistry

Cr(OH)3Cr+3+3OH- 1. which direction will equilibrium change if CrCl3 is added, why? 2. which direction will equilibrium change if HCL is added, why?

357. ## equation

For the following linear inequalities draw the feasibile region i: x _>1 ii: x+y _

358. ## Math

Solving quadratic equations by graphing? 3. x2-4x + 6 = 0 4. x2-4x-1=0 5. 4x2-12x + 3 = 0 6. x2-2x-4=0

359. ## linear equation

For the following linear inequalities draw the feasibile region i: x _>1 ii: x+y _

360. ## Chemistry

Cr(OH)3Cr+3+3OH which direction will equilibrium change if CrCl3 is added and why. which direction will it change if HCL is added and why?

361. ## Math

Write a mulplication problem. It's a square where 50 little squares are shaded, 20 are not shaded and 30 are double shaded

362. ## Chemistry

Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.

363. ## algebra 2

Factor completely 6r^2+13rd+6d^2. I'm sorry, you are absolutely correct, there was a typo it was>>> (6b), the correct is 6d. thank you for spotting that mistake.

364. ## Chemistry

Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.

365. ## Chemistry

Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.

366. ## algebra 2

Factor completely 6r^2+13rd+6d^2. I'm sorry, you are absolutely correct, there was a typo it was>>> (6b), the correct is 6d. thank you for spotting that mistake.