# Questions Asked onOctober 7, 2012

1. ## Statistic

Mamma Temte bakes six pies a day that cost $2 each to produce. On 15% of the days, she sells only two pies. On 27% of the days, she sells 4 pies, and on the remaining 58% of the days, she sells all six pies. If Mamma Temte sells her pies for$4 each, what

2. ## Physics

A billiard ball strikes and rebounds from the cushion of a pool table perpendicularly. The mass of the ball is 0.38 kg. The ball approaches the cushion with a velocity of +2.10 m/s and rebounds with a velocity of -2.00 m/s. The ball remains in contact with

3. ## chemistry

describe step by step, how will you prepare 10 mL of 0.020 M HCL from the 0.050 M solution?

4. ## Chemistry

What are three common types of products produced by reactions that occur in aqueous solutions? (out of the following) -gases -water -electrons -precipitates -acids -ions -bases

5. ## Chemistry

Which of the following molecules has the highest boiling point? CH4,BH3,NH3, SH2?

6. ## Chemistry

Nitrogen and hydrogen combine at high temperature, in the presence of a catalyst, to produce ammonia. N2(g)+3H2(g)-->2NH3(g) Assume 4 molecules of nitrogen and 9 molecules of hydrogen are present. After complete reaction, how many molecules of ammonia are

26. ## FREE BODY DIAGRAM calculus

A car is traveling north towards an intersection at 60mph at the same time a truck is headed east toward the same intersection at 45mph. Find the rate of change of the distance between the car and truck when the car is 3 miles south of the intersection and

27. ## physics

Sue and Jenny kick a soccer ball at exactly the same time. Sue’s foot exerts a force of 52.7 N to the north. Jenny’s foot exerts a force of 91.8 N to the east. a) What is the magnitude of the resultant force on the ball? b) What is the direction of the

28. ## Chemistry

Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of is present in a helium-oxygen mixture having a density of 0.498 at 25 and 721 ?

29. ## physics

A baseball leaves a pitcher's hand horizontally at a speed of 115 km/h. The distance to the batter is 18.3 m. (Ignore the effect of air resistance.) (a) How long does the ball take to travel the first half of that distance? (b) The second half? (c) How far

30. ## Maths

There are 175 pupils in a hall. 40% of them are boys. 25 girls enter the hall. What percentage of the pupils in the hall now are boys?

31. ## physics

A ball rolls horizontally off a 3.2 m high table and lands 2.2 m from the end of the table. What is the horizontal velocity of the ball when it leaves the table?

32. ## Physics

A truck is stopped at a stoplight. When the light turns green, the truck accelerates at 2.0 m/s2. At the same instant, a car passes the truck going 13 m/s. Where and when does the truck catch up with the car? _________m (from the intersection)

33. ## Chemistry

1. How many moles of Al(CN)3 are in 199 g of the compound? 2. 96.0 mol of P4O10 contains how many moles of P? 3. If 4.71 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction? C5H12+8O2 ->

34. ## chemistry

A 2.33-g sample of a mixture of CaCl2 and Ca(NO3)2 is treated with excess AgNO3(aq). The precipitate is filtered off, dried and weighed. The dried precipitate weighs 3.9 g. What is the percentage by mass of CaCl2 in the original mixture?

35. ## Chemistry

The standard enthalpy of formation of Mn2O3 is −962.3 kJ/mol. How much heat energy is liberated when 4.7 grams of manganese are oxidized by oxygen gas to Mn2O3 at standard state conditions? Answer in units of kJ

36. ## precalc

what is the minimum degree of a polynomial. How do I find that and how do I find the maximum nuber of turnin points. I know it has to do with n-1 but Idont know how

37. ## Chemistry 103

To what volume should you dilute 50ml of a 13M stock HNO3 solution to obtain a 0.131M HNO3 solution?

38. ## Analytical chemistry

what is the mass (in milligrams) of solute in 26.0mL of 0.25M sucrose (342g/mol)?

39. ## Physics

A car is traveling at 42.0 km/h on a flat highway. (a) If the coefficient of friction between road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop? m (b) What is the stopping distance when the surface is dry and

40. ## science-physics

A swimmer, capable of swimming at a speed of 1.97 m/s in still water (i.e., the swimmer can swim with a speed of 1.97 m/s relative to the water), starts to swim directly across a 2.77-km-wide river. However, the current is 1.13 m/s, and it carries the

41. ## Chemistry

2KClO3 ----> 2KCl + 3O2 Calculate the number of grams of KClO3 decomposed given an initial sample mass of 2.16g and a residue mass of 1.71g?

42. ## QNT/351

The names of the positions in a corporation, such as chief operating officer or controller, are examples of what level of measurement?

43. ## Statistic

Mamma Temte bakes six pies a day that cost $2 each to produce. On 15% of the days, she sells only two pies. On 27% of the days, she sells 4 pies, and on the remaining 58% of the days, she sells all six pies. If Mamma Temte sells her pies for$4 each, what

70. ## Computer (Programming with Python)

Problem 1: Multiplication Drill Computers can perform calculations extremely quickly and accurately, but it's often handy to calculate with the computers we carry around inside our heads. Write a program to drill you in multiplication tables. Your program

71. ## Math 8 - help!!!

Kylie needs to cut 6 pieces of yarn that are each 2/3 foot long. How much yarn does Kylie need? 2/3 x 6 right?

92. ## chemistry

calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution

93. ## poe

When Maggie applies the brakes of her car, the car slows uniformly from 15.9 m/s to 0 m/s in 2.43 s. How far ahead of a stop sign must she apply her brakes in order to stop at the sign? Answer in units of m

94. ## physics

An 18-year-old runner can complete a 10.0-km course with an average speed of 4.53 m/s. A 50-year-old runner can cover the same distance with an average speed of 3.91 m/s. How much later (in seconds) should the younger runner start in order to finish the

95. ## Maths Percentage

2/5 of the children in an art club were girls. 1/4 of the girls and 5/6 of the boys took part in a competition. 12 boys did not take part in the competition. a.) What percentage of the pupils in the art club did not take part in the competition? b.) How

asked by Unknown Error
96. ## Stats

Construct a scatterplot for the (x, y) values below, and answer the following questions. You do NOT need to submit your scatterplot with your answer; however, show all other work. x y 1 2.5 2 5.0 3 7.5 4 10.0 5 12.5 - What would be the slope of this

97. ## Physics

Velocity/instantaneous velocity question? In a demonstration a ball falls directly to the ground. Which of the following statements about this event is not correct? (Assume downward is the positive direction.) a)The average velocity during the first half

98. ## English

1. He stayed up late studying last night. 2. He stayed up late while he was studying last night. 3. He stayed up late while he studied last night. (Does #1 mean #2 or #3? Do we have to use 'while' or'when', etc?)

99. ## Chemistry

Given the standard heats of reaction Reaction ∆H0 M(s) + 2 X2(g) → MX4(g) −123.7 kJ/mol X2(g) → 2 X(g) +297.3 kJ/mol M(g) → M(s) −25.1 kJ/mol calculate the average bond energy for a single M- X bond

An accelerometer in a control system consists of a 2.42 g object sliding on a horizontal rail. A low-mass spring is connected between the object and a flange at one end of the rail. Grease on the rail makes static friction negligible, but rapidly damps out

101. ## PHYSICS

At a drag race, a jet car travels 1/4 mile in 5.2 seconds. What is the final speed of the car and its acceleration?

102. ## physics

A bicycle has wheels with a diameter of 0.630 m. It accelerates uniformly and the rate of rotation of its wheels increases from 197 rpm to 300 rpm in a time of 22.5 s. Find the linear acceleration of the bicycle

103. ## physics

A tire placed on a balancing machine in a service station starts from rest and turns through 4.82 revolutions in 1.48 s before reaching its final angular speed. Calculate its angular acceleration

104. ## fractions 7th grade

ty's football practice lasted 2 1/2 hours. if 1/4 of the time was spent catching passes, how much time was spent catching passes?

105. ## math

the distance between two stations is 300km. two trains start simultaneously from these stations and move towards each other ,the speed of one them is 7k/hr more than the other . if the distance between them after 2hours of their start is 34km ,find the

106. ## Maths

A school has 1800 pupils. 55% of the pupils are girls. 30% of the girls and 70% pf the boys travel by bus. a.) How many girls travel by bus? b.) How many boys travel by bus? c.) What percentage of the pupils travel by bus?

107. ## physics

a block of mass m=0.9 kg is connected to a spring of force constant k= 775 N/m on a smooth horizontal surface. plot the potential energy of the spring from x= -5 cm to x= 5 cm. determine the turning points of the block if its speed at x= 0 is 1.2 m/s.

108. ## chemistry

A patient with polycythemia vera(excess production of red cells) receives raioactive phosphorus-32. Why would this treatment reduce the production of red blood cells in the bone marrow of the patient?

asked by Boo Boo
109. ## Chemistry

To what temperature in K must a variable volume container of helium gas be cooled to obtain a final volume of 0.182 L? The initial volume and temperature are 2.34 L and 314 K, respectively. The pressure and number of moles are fixed. You're supposed to us

110. ## social studies

Type of movement of the plates that created the landform 1. mountanis 2. valleys 3. plains 4. islands 5. deserts 6. plateaus

111. ## math

The function f(x) = ax^3-x^2+bx-24 has three factors. Two of these factors are x-2 and x+4. Determine the values of a and b, and then determine the other factor

112. ## physics

A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of 70 kg, and the height of the water slide is 12.2 m. If the kinetic frictional force does

113. ## physics

the velocity acquired by a body moving with uniform acceleration is 12 m/s2 in 2 secs.and 18 m/s2 in 4 sec. find the initial velocity of the body?

114. ## statistics

1)Let X have a normal distribution with mean 6 and standard deviation 3. a) What is the probability that X > 8.7 2)What is the probability that X 1.9 ? I have got so far: P(Z > 0.9) but I do not know where to go from here! Thank You

115. ## physics

Consider the Earth and a cloud layer 600 m above the planet to be the plates of a parallel-plate capacitor. (a) If the cloud layer has an area of 2.0 km2 = 2000000 m2, what is the capacitance?

116. ## stats

. Find the mean and standard deviation of the following probability distribution: x 1 2 3 P(x) 0.4 0.25 0.35 Please show all of your work.

117. ## physics

A 22.4-g bullet is fired from a rifle. It takes 3.37 × 10-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 740 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted

118. ## algebra 2

i'm trying to solve this system of equations with 3 variables 5a-b+3c=5 2a+7b-2c=5 4a-5b-7c=-65 i tried to make the first equation like a=something so i could substitute it in to the 2nd equation, however i get decimals so it doesnt work how do i do this

119. ## Algebra

A rectangle is 4 inches longer than it is wide. It's perimeter is 28 inches. Write a system of two equations in two variables that describes this information. Then solve the system graphically.

120. ## English

Which of the following sentences is without any surface errors? a. Its up to Georgia and I who drives the car, whether Celine likes it or not. b. I reluctantly gave the hamster to my cousin because I was afraid Teddy, my cat, would attack it. c. The town

121. ## Chemistry

What volume of a 0.164 M potassium hydroxide solution is needed to exactly neutralize 0.680 grams of KHP ?

122. ## Chemistry

In a certain mixture, one compound may be decomposed by heating, releasing 0.78 gram of oxygen. It is calculated that the oxygen makes up 21.5% of the compound. If the total mixture has a mass of 8 grams, what percentage of the mixture is the original

123. ## physics

A dog runs 150{\rm m} away from its master in a straight line in 8.4{\rm s} , and then runs halfway back in one-third the time.Calculate its average speed,average velocity?

124. ## math

Explain why there is no number that can replace n to make the equation /n/ = -3 true.

125. ## physics

A train at a constant 68.0 km/h moves east for 41 min, then in a direction 65.0° east of due north for 22.0 min, and then west for 60.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of

126. ## Chemistry

HC8H4O4K + NaOH = H2O + H4C8O4KNa I'm given the volume of NaOH in mL (ex: 9.11 mL), and I have to convert it to moles. How can I do that conversion? Please help by explaining if you can, I've had trouble with this problem for the whole week..

127. ## Math

Suppose a triangular silk scarf has both of its shortest sides 14 inches long. If the angle between these sides is 110º, what is the area of the scarf? Round your answer to the nearest tenth of a square inch.

128. ## Math 8 = help!!!!!!!!!!

Gina brought a magazine subcription. The magazine company charged $15.75 for the subcription and$2.15 for each issue. If Gina paid $45.85, how many issues did she receive?$45.85 - 15/ 75????? I'd been having a bit trouble with this question so this is

129. ## Statistics

. In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 15 patients using the drug is selected. Find the probability that: (A) exactly three will have this mild side effect (B) at least

130. ## Chemistry

What is wrong with this ionic equation and what is the correct way to write it? Cl2(aq)+ 2K+(aq)+2Br(aq)->Br2(aq)+ K+(aq)+ 2Cl-(aq)

131. ## Computer studies

Draw a flowchart for a program that will accepts 30 intergers and print the number of positive and negatives numbers and the sum of the positive number

132. ## Chemistry

making 2 moles of No in a reaction requires 180KJ of energy. How much No will be made if this same reaction absorbel 950KJ OF ENERGY

133. ## Physics

A 85.0 kg base runner begins his slide into second base when he is moving at a speed of 2.10 m/s. The coefficient of friction between his clothes and Earth is 0.570. He slides so that his speed is zero just as he reaches the base. (a) How much mechanical

134. ## Statistics

What is the probability that we would obtain two sample means that differ by 1.875, when the SD of the sampling distribution is estimated at .125 when our sample has 8 subjects?

135. ## physics

How do I find the acceleration on a velocity time graph when the graph has an irregular shape.

136. ## math

james is making fruit juice, using fruit cordial and water. the label on the cordial says "to make 1 litre of fruit juice, use 200 ml of cordial and 800 ml of water" james uses 250 ml cordial and 850 ml of water. is james using the correct proportions?

137. ## Chemistry

What is the mole fraction of ethanol when 5.00 mL of ethanol are combined with 10.00 mL of water?

138. ## Chemistry

Suppose 1 gram of Li2CO3 is reacted with in 50.0 mL of 3.00 M HCl. What would be the mass of CO2 liberated in the reaction? After the reaction, how many moles of HCl are left over?

139. ## pre calculus

Algebraically solve the system of equations using any method you wish 3x-10y+z=5 -4x+9y-z=-6 -13y+z=2

140. ## Chem

Balance the following redox reactions in acidic solution by the half-reaction method Br–(aq) + I–(aq) + HClO(aq) = Br2(l) + IO3 + Cl–(aq)

141. ## physics

A train at a constant 68.0 km/h moves east for 41 min, then in a direction 65.0° east of due north for 22.0 min, and then west for 60.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of

142. ## physics

an object 12 kg of mass slides over a surface with horizontal force of 75 N. The friction force is of 17 N. Determine the acceleration of the object.

143. ## physics

Betty Bodycheck (mB = 60.0 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 46.3 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a

144. ## algebra

10y^3+y^2-21y

145. ## English

1. The Beatles were not happy at all. 2. The Beatles was not happy at all. (Which one is grammatical?)

146. ## Chemistry

Consider a saturated solution of calcium fluoride in 0.086 M potassium nitrate. Complete the following tasks, and then answer the question. a) Write the chemical equation corresponding to Ksp. b) Write the defining expression for the thermodynamic

181. ## Math Coll

Find the coeficient of x^18 y^32 z^25 in (x + y + z)^75? How many monomials appear in the expansion of (x + y + z)^75?

Let 1

183. ## Physics

I eat a 500 Calorie lunch and go hiking up a mountain afterwards. Assuming that chemical energy is converted to gravitational potential energy with 50% efficiency, approximately how many miles up the mountain can I go before I need my dinner? 0.5 miles 1

184. ## Math

What is 71 times 65 in ladder form

185. ## Math 8 - HW Qs. Check

Amy watched television for 2 3/4 hours. Charles watched television for 1/3 of the time Amy did. How long, in minutes did Charles watch television. 2 3/4 - 1/3 right?

186. ## Word study slash english

What are some words with the ay slash igh sound

187. ## ciao

disegno di due segmenti uno il triplo dell'altro

188. ## stats

How many green elements are required to make this a legitimate probability distribution if there are a total of 50 elements in this sample? x red blue orange brown green P(x) 0.18 0.20 0.32 0.28

189. ## Math 8 - HW. Qs. Check

12 + v/2 = 17 My Answer - 10 right?????

190. ## Science

Please list breeds of pigs found in the caribbean thank you.

191. ## Oral Book Report

My book is titled The Battle Of The Labyrinth. I have to do a Sentence Outline for this Oral Book Report. But i don't know where to start from to write my sentence outline. Should i go over the book again, or just find important stuff about it? The author

192. ## chemistry

I thought about the syntax of the problem and I have surmised that what I thought were two questions was actually one. I'm slow but not dead yet. 75g of tartaric acid in 1 liter is used in a titration. 25mL of tartaric acid solution is titrated against

193. ## QNT/351

What level of measurement is the number of auto accidents reported in a given month?

194. ## CALCULUS help! =)

find the derivative of f(x)=3x^2-x using the limit definition.

195. ## CALCULUS help!!!=))

find dy/dx (-x^2)(y)+2xy=3y^2-7

196. ## physics

A hot air balloon descends with an overall velocity of 4.2 m/s at an angle of 36.8⁰ below the horizontal. what is the horizontal velocity of the balloon?

197. ## maths

if the size of each exterior angle of a regular polygon is 90 degrees how many sides does it have?

198. ## Math

What is the derivative of ln(xe^5x)?

199. ## High School Math

Use >,< or = to complete the statement. |-10| |11| A. > B. = C.< I chose C is that correct I get confused because they are enclosed

find derivative of: f(x)=e^2 I know that b/c e is a constant the answer is 0, but how do I show that in my work?

201. ## world history

the San hunters of southern africa weren't overwhelmed during the nineteenth century because they a. were protected by a treaty b. were moved to reservations where they could be protected c. live in a harsh encironment d. managed to effectively fight off

202. ## Physics

Whats the difference between uniform acceleration graph and a constant acceleration graph? Both graphs look the same and I can differentiate them...

203. ## Math

What is the derivative of sin(x)(cos(x)-2)?

find the equation for the line tangent to the curve at the given point. y=((x^2)+1)/((x^2)-1) at (2, 5/3)

205. ## FISICA

10. Una partícula se encuentra en una circunferencia de 7.5 m de radio con una velocidad constante de 3 m/s. En cierto instante, frena con una aceleración constante de 2 m/s2 hasta detenerse. a. ¿Cuál es la aceleración de la partícula antes de

206. ## calculus =)

find the derivative of g(x)=sin(cos(sin(pi*x)))

207. ## english

what can be considered as leadership and if it like clubs and job. what else it could be?

208. ## AP Human Geography

Identify the relationships between religion and government/political power in some regions of the world. I have a huge test tommorow! Please answer this, i love ya'll!

209. ## lit- sentence rewording

I'm writing an essay and I keep using opportunities, accusations, and believe a lot. Are there any other words similar to this one?

210. ## Chem

To what temperature in K must a variable volume container of helium gas be cooled to obtain a final volume of 0.182 L? The initial volume and temperature are 2.34 L and 314 K, respectively. The pressure and number of moles are fixed. You're supposed to us

211. ## math

please help me if x over 4 minus a over b is equal to 0 b is not equal to 0, then x equals what? thanks

212. ## physics

plz tell me how does wireless communication work in a jist

213. ## Health and Nutrition

What are some benefits of taking dietary supplements

214. ## physics

A 30lb sand bag falls off a hot air balloon floating stationary 5000ft above the ground what is the speed of the bag at the moment it hits the ground?

215. ## Social science

Social conflict, empowerment theory and feminist theory. How are the theories similar? How are the theories different? What are the implications for interventions and community development?

216. ## physics

a fly wheel of mass 66kg and 2m radius makes 55rpm.assuming mass is concentrated at the rim.calculate the angular velocity and moment of interia

217. ## chemistry... HELPP

Place charges and electron dots as needed on each ion. As Se Br K Ca Ga. I answered: As3+ Se2- Br- K+ Ca2+ Ga2+ but i got it wrong so please helppp!!!

218. ## math

. What’s the better deal: 1 lb. of Boars Head ham for $7.99 or ¾ lb of Boars Head ham for$5.49? Explain/show why.

219. ## math

how do u reduce 8 gal 9pt

220. ## Math

What is the derivative of (x^2+4x+5)/(x^3-2x)?

221. ## CALCULUS help!!!=))

find dy/dx -x^2y+2xy=3y^2-7

222. ## Math

What is the derivative of ((e^pie/3)(cosx))? Is it pie/3e^pie/3 times cosx - e^pie/3 times sinx?

223. ## Math

Is the derivative of (squarerootof x)/(3x+1) : 3x+1-3squarerootofx/(2squarerootofx)(3x+1)^2

224. ## ALG 2!!!

WRITE AN EQUATION IN SLOPE-INTERCEPT FORM FOR THE LINE DESCRIBED. SLOPE 3,Y-INTERCEPT AT 4

225. ## logic

A conditional sentence with a false antecedent is always (Points : 1)

226. ## Communication

is it possible to adapt listening styles to circumstances? give an example

227. ## math

simplify 5+1/3*1/3*1/3-(1/9+1/9)

228. ## math

2 over x minus 3 is equal to 26 over x what is x? can u please help me

229. ## Health and Nutrition

What are the government regulations surrounding dietary supplements?

230. ## math

if x over 4 minus a over b is equal to 0 b is not equal to 0, then x equals what? thanks