Questions Asked on
March 21, 2014

Science**updated asnwers**
5.B 6.A 7.C 8.D 9.A 11.D 13.D 5. Which of the following types of pollution cannot be attributed to car and truck emissions? A. acid rain B. sedimentation C. ozone D. photochemical smog 6. Which of the following is a source of photochemical smog? A. fossil
asked by matt 
chemistry
Given these standard reduction potentials at 25oC: Cr3+ + e > Cr2+ (E1^o = 0.407V) Cr2+ + 2e > Cr(s) (E2^o = 0.913V) Determine the standard reduction potential at 25oC for the halfreaction equation: Cr3+ + 3e > Cr(s) This seems like a really
asked by Bobz 
Social studies***help***
1.C 2.B 3.B 1.How would Bolivian society today most likely be different, if not for its Spanish colonial past? A. It would not have social inequalities of any kind. B. It would have a smaller population of indigenous peoples. C. It would not be dominated
asked by matt 
physics
Three identical uniform meter sticks are placed on the floor. The first stick lies along the y axis from y = 0.320 m to y = 1.32 m. The second stick lies along the x axis from x = 0.330 m to x = 1.33 m. The third stick is positioned so that one end is on
asked by Sami 
Chemistry
carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constanst (K) for this reaction (delta Gf values: H2CO3=  616.1, H2O=  237.1, CO2=  394.4) . Carbonic acid then ionizes in water (Ka1= 4.5 x 10^7). Ignoring
asked by Chem 
Math  PreCalc (12th Grade)
The function f(x) = 2x + 1 is defined over the interval [2, 5]. If the interval is divided into n equal parts, what is the value of the function at the right endpoint of the kth rectangle? A) 2+3k/n B) 4+3k/n C) 4+6k/n D) 5+6k/n E) 5+3k/n
asked by Shawna 
ChemistryRepost for DrBob222
500 ml of a buffer solution with ph=2.10 must be prepared using .4 M HNO2 and solid KNO2. The ka value of HNO2 is 4e3. a.) What mass of KNO2 should be added to 3 L of the HNO2 to make the buffer? b.) What is the buffer's pH after 150 ml of .5 M HNO3 is
asked by Anonymous 
physics
A person has a choice while trying to move a crate across a horizontal pad of concrete: push it at a downward angle of 30 degrees, or pull it at an upward angle of 30 degrees. If the crate has a mass of 50.0 kg and the coefficient of friction between it
asked by santoki 
Chemistry
The Heisenberg Uncertainty Principle: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of mm = 0.100fg\rm fg (where a femtogram, fg\rm fg, is 10−15g\rm 10^{15}\; g) and is swimming at a velocity of vv =
asked by Anna 
math
Which expression represents the sum or (2x5y) and (x+y)?
asked by **please help** 
Biology
oil spills and leaks in the pacific ocean have harmed marine organisms and the environment. which kind of environmental issue is illustrated by this example? a) Resource Use b) Pollution c) Population Growth d) Biodiversity
asked by Skyler 
math
How many faces, edges, and vertices does the solid figure have? image
asked by lina 
Physics
You pull a sled across a horizontal frictionless patch of snow. If your pulling force is in the same direction as the sled's displacement and increases the kinetic energy of the sled by 34%, by what percentage would the sled's kinetic energy increase if
asked by Marcus 
english
Which one of the following is a correct example of the singular possessive case? A. king's rights B. audiences' reaction C. women's club D. who's job I think it's C.
asked by Kimberly 
Math: Thinking Mathematically
A flagpole has the height of 16 yards It will be supported by three cables, each of which is attached to the flagpole at a point 4 yards below the top of the pole and attached to the ground at point that is 9 yards from the base of the pole, Find the total
asked by Brandon 
math
The life of automobile voltage regulators has an exponential distribution with a mean life of six years. You purchase an automobile that is six years old, with a working voltage regulator and plan to own it for three years. a)What is the probability that
asked by ash 
Algebra
Please explain how to do this problem. The answer says the answer is 2.43 inches, but I don't get it. A school wants to take out an ad in the paper congratulating a basketball on a successful season. The area of the photo will be half the area of the
asked by Anonymous 
Chemistry
The Heisenberg Uncertainty Principle: A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of mm = 0.100fg\rm fg (where a femtogram, fg\rm fg, is 10−15g\rm 10^{15}\; g) and is swimming at a velocity of vv =
asked by Anna 
Algebra
Simplify the expression, if possible. State the excluded values, if any. 1. 5x  5/ 10x^2  25x + 15 2. w^2 + 6w + 9/ 2w^2  18 Thanks so much.
asked by Student 
Physics
Help please A 200.0 g copper block absorbs 2.34 × 10^3 J of heat to raise its temperature by 30.0 K. What is the specific heat of copper?
asked by Me and I 
algebra
The manager of a bulk foods establishment sells a trail mix for $6 per pound and premium cashews for $13 per pound. The manager wishes to make a 315pound mixture that will sell for $8 per pound. How many pounds of each should be used?
asked by sandra 
Probability
Assume Z has a standard normal distribution. Use Appendix Table III to determine the value for z that solves each of the following: (Round your answer to 2 decimal places.) P(Z
asked by ash 
algebra
An artist intends to paint a 98squarefoot mural on the large wall show below. Find the dimensions of the mural if the artist leaves a border of uniform width around it.
asked by f 
Physics
A bullet is fired into a block of wood with speed 250 m/s. The block is attached to a spring that has a spring of 200 N/m. The block embedded bullet compresses the spring a distance of 30.0 cm to the right. Determine the mass of the wooden block
asked by Dale 
statistics
Consider a binomial experiment with 20 trials and a probability of 0.45 on a single trial.Use the normal distribution to find the probability of exactly 10 successes.
asked by john 
physics
Block A, with a mass of 50 kg, rests on a horizontal table top. The coefficient of static friction is 0.40. A horizontal string is attached to A and passes over a massless, ideal pulley as shown. What is the smallest mass of Block B that will start A
asked by santoki 
english
Which of the following sentences contains an italicized word that's used as a predicate adjective? A. Jerry looks into the microscope. B. Jerry looks ill today. C. Jerry looks at the map. D. Jerry looks disdainfully at the pile of laundry. I think it's B.
asked by Lydia 
Probability
The life of automobile voltage regulators has an exponential distribution with a mean life of six years. You purchase an automobile that is six years old, with a working voltage regulator and plan to own it for three years. a)What is the probability that
asked by ash 
Probability
Suppose X has an exponential distribution with . Determine the following. Round the answers to 3 decimal places. a) P(x=2) c) P(X
asked by ash 
physics
A solid block of mass m2 = 1.0 $kg$, at rest on a horizontal frictionless surface, is connected to a relaxed spring (with spring constant k = 260 N/m whose other end is fixed. Another solid block of mass m1 = 2.4 kg and speed v1 = 3.3 m/s collides with the
asked by Tay 
math
A state fair had 1,019,887 people in attendance. The fair committee performed a survey. The question was, “What do fairgoers enjoy most about the fair?” Of those who responded, 83% reported eating traditional
asked by joe 
english
Choose the sentence that has a subject complement. A. The day ended with many surprises. B. I felt much better. C. The nurse felt my pulse. D. We can't leave without seeing I think it's B.
asked by Amanda 
Physics
If a motorboat travels 25km/h towards the sea, down a river whose velocity is 4km/h what is the boats velocity related to the shore?
asked by Ana 
physics
An advertisement claims that a particular automobile can "stop on a dime". What net force would actually be necessary to stop an automobile of mass 850kg traveling initially at a speed of 56.0km/h in a distance equal to the diameter of a dime, which is
asked by Jackie 
Physics
A train is moving at a speed of 30 m/s toward a stationary observer at a train station. The train whistle blows with an actual frequency of 336 Hz. What horn frequency is heard by the engineer (riding on the train)?
asked by Anonymous 
Math  PreCalc (12th Grade)
What is the value of this expression when n approaches infinity? 4−(4/n)+(5/n)+(15/3n^2) A) 20 B) 10 C) 5 D) 4 E) 1
asked by Shawna 
English
Write an essay explaining why you think The Tragedy of Romeo and Juliet remains so popular. What is it about the characters of The Tragedy of Romeo and Juliet that makes it so easy for young people to identify with them? Make at least two references to
asked by Talha 
Chemisty  Unsure how to proceed Combustion rxn
Question as follows: If you combusted 23g of ethanol with an excess of oxygen how much heat would be released or absorbed? the only thing I've deduced is the chemical reaction: C2H6O + 302 > 3H20 + 2C02 I'm not sure how to proceed. I need Q. Not sure
asked by Angely R. 
ChemistryRepost for DrBob222
My question was: A saturated solution of MgF2 at 23 degrees C was prepared by dissolving solid MgF2 in 1 L water. The Ksp of MgF2 is 1.5e5. a.)Calculate the mass of MgF2 dissolved. b.) When .1 mols of solid KF was dissolved in the MgF2 solution,
asked by Anonymous 
english
In which sentence are the conjunctions used correctly? A. The top award was given to neither Steve or Jim. B. Either Fred nor John knew about the accident. C. Mary enjoyed neither roller skating or ice skating. D. Neither beauty nor popularity was
asked by Kelsy 
writing
Which of the following does not belong in a conclusion paragraph?
asked by Anonymous 
physics/calc
An anchor weighing 110 lb in water is attached to a chain weighing 2 lb/ft in water. Find the work done to haul the anchor and chain to the surface of the water from a depth of 35 ft.
asked by j 
statistics
Suppose the average body temp is 98.6 assume the variable is normally distributed with a standard deviation of .74 degrees. suppose a sample of 100 is taken. what is the probability that the mean is below 98.4??? Between 98.5 AND 98.7??
asked by roger 
Physics
A 300 kg piano slides 4.4 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.(a) Calculate the magnitude of the force exerted by the man.(b)
asked by Hope 
algebra
Find the sum a+(a+1)+(a+2)+…….(a+n1) in terms of a and n
asked by Jiskha 
Math
An architect has allocated a rectangular space of 465ft^2 for square dining room and a 16ft wide kitchen. Find both the width of the square dining room and the length of the entire rectangular space.
asked by Pam 
ChemistryRepost for DrBob222
The reaction OH + NH4+ = H20 + NH3 is kinetically first order in both reactants' concentrations. The rate constant is 2e10 1/M s. If 50 ml of .01 M NaOH is mixed with 50 ml of .01 M NH4CL, find the time required for the OH concentration to reach 1e4 M.
asked by Anonymous 
scholarship essay edit
can someone edit this? Throughout my life’s journey, I have come to attain two true passions  the first one being English studies. Since the very dawn of childhood, I have been known to bleed the calligraphic content of Gary Soto's brilliant poetry and
asked by christine 
Math
Today you deposited $5000 into a savings account paying 12% interest. How much should you have in 15 years?
asked by lisa 
statistics
the average act score submitted to a certain university is 26. to be eligible for admission, a student must score in the top 6% of applicants. if the scores are normally distributed with a standard deviation of 2.4, what is the minimum score needed to be
asked by roger 
physics
if an airplane is traveling at 550 km/h into a head wind with a velocity of 40km/h what is the airplanes velocity relative to the ground
asked by Ana 
arithmetic
An investment of $2,000 is earning interest at the rate of 6.2% compounded quarterly over 5 years. Approximately how much interest is earned on the investment?
asked by tiffany roberts 
Math and Music
I have to do a presentation on how math and music relate. I have found some things and facts but everything is so complicated. If someone could help explain to me how I can narrow my topic down and make a presentation that is simple but effective. It can
asked by Madi 
Chemistry
Given that 20 ml of a weak acid (HA) was titrated with NaOH and the titration curve of pH vs titrant volume in ml is given, find the initial concentration of the acid? The problem gives the full titration curve starting at pH=2.2 at 0 ml added and with the
asked by Anonymous 
algebra
The formula for the area of a trapezoid is A = h(B + b) 2 . The area of the trapezoid truss in the illustration is 72 square feet. Find the height of the truss shown below if the shorter base is the same as the height.
asked by f 
math
A farmer wants to construct a pen with 100 feet fencing. The pen will be divided into two areas. Find the dimensions of the big pen. You may use your calculator or the fact that the xcoordinate of the vertex of a parabola is x=b/2a. I would like to show
asked by dave 
maths
A rope AB attached to a small block of neglible dimensions and passes over apulley C so that its free end hangs 1.5 metres above ground. When block rests on the floor. The end A of the rope is moved horizontally in astraight line by a man walking at a
asked by ramya 
Language Arts
Why is the statement "The bill will be too harsh" an opinion? a. it can be proved b. it can be supported with evidence c. it is someones belief ** d. it is true. Which statement is an appeal to emotions? a. The bill unfairly targets one group for unusually
asked by Felicia 
geometry
a circle has diameter endpoints of A(5,10) and B(3,4). what are the coordinates of the center of the circle
asked by leann 
ChemistryRepost for DrBob222
A sample of C60O3 decomposes with an activation energy of 50 kg/mol, an Arrehnius prefactor of 2e10 s1 and a k value of .04 s1. How long does it take for a 25 mg sample at 25 degrees C to produce 10 mg. Your response was is that C60O3 or what? And I
asked by Anonymous 
Algebra
1) There are two pet stores in zacharys town. There are dogs, cats, and hamsters at the first pet store. The second store has dogs, rabbits, and fish. Write a set that represents all of the different pets stores in the town. 4) The cheerleading squad is
asked by Help me?? 3 questions 
Economics HELP PLEASE!!!!
Can someone please help me with a hint to solve this problem?? I'm struggling really hard with this. "Consider an oligopolistic market with two firms. Each of them produces using a cost function given by c(q)=q^2. The aggregate demand in the market is
asked by Anonymous 
physics
If a motorboat travels 25km/h towards the sea, down a river whose velocity is 4km/h what is the boats velocity related to the shore? A, 21 km/h B, 29km/h C, 25 km/h D, 4 km/h
asked by ana 
algebra
For what value of x is the rational expression below equal to zero? X4/(x+5)(x1)
asked by Anonymous 
Achieving Academic Excellence
The measure of how much we understood and learned in a college course is referred to as: A. assessments. B. grades. C. testing. D. feedback.
asked by Anny 
Achieving Academic Excellence
A discussion board in an online course can be another form of: A. communication. B. assessment. C. objective test. D. free expression.
asked by Anny 
biology
I need help with what is happening inside the mitochondria. may help me what's happening 050 secondes. h t t p: // w w w.y o u t u b e.c o m / watch ?v=RrS2uROUjK4
asked by jess 
math
Anna bought a camera that was 20% off the regular price of $1,080. If an 8% sales tax was added to the cost of the camera, what was the total price she paid for it?
asked by **please help** 
literacy
im in grade 10 and if i do the osslt literacy practice tests. will someone on here mark my writing tasks? i can mark the multiple choice questions on my own but i just need someone to mark the writing stuff
asked by ann 
Math
What does Please Excuse My Dear Aunt Sally mean?
asked by Anonymous 
English
I'm writing about hearing a certain song can take you back to a moment in your past. I know that the 1st paragraph is thesis and the 2nd is explain what song reflects on past and why. I don't know what i should in include in the 3rd paragraph
asked by Anonymous 
language of medicine medical billing and coding
How does the musculoskeletal system change from birth to adulthood and what are the steps that the system goes through from childhood to adulthood to reach 206 bones?
asked by Jessica 
PRECALC
If the original coordinate axes are rotated 45° to obtain the x' and y' axes, what is the value of x in terms of x' and y'?
asked by Anonymous 
Geometry
CD has an endpoint at (2,1)and a midpoint at (8,3). which measure is closest to the length of CD?
asked by Alicia 
english
Which synonym of the word look would be most effective in the following sentence? Detective Flint leaned forward with narrowed eyes to _______ what appeared to be a vital clue. A. survey B. scrutinize C. view D. ogle I think it's B.
asked by Brittany 
Physics
A ball is traveling down a straight track at 20 m/s. How fast will the ball's speed be after it climbs a hill in the track that is 15 m high?
asked by Eiban 
writing
How many supporting details should you develop to back up your thesis?
asked by Anonymous 
english
17. In which sentence is the word but used as a preposition? A. John liked baseball but not football. B. We would like to visit the Grand Canyon, but our vacation time is up. C. Children should be seen but not heard. D. None but the brave shall enter in.
asked by marie 
Plays
Suppose something like this is in the script of a dramatic scene: MARY.[Scared] I don't know what happened. Is it okay if I have a period after "scared?" I know it isn't required, but is it wrong or still okay?
asked by Anonymous 
algebra
Write the equation in quadratic form and solve it by factoring. x2(8x + 65) 63 = x
asked by f 
math
describe a situation in which you might use each calculation a)9/8 divided by 2/3 b)1 and 2/3 divided by 2 and 2/3
asked by Mari 
reading
in to kill mockingbird which character influences others more?
asked by anonymous 
achieving academic excellence
An example of an objective test is: A. short answers. B. essaytype exam. C. fill in the blanks. D. discussion board.
asked by Anny 
please
How many moles of Ca(OH)2 are needed to produce 82.9g of Ca3(PO4)2?
asked by Anonymous 
Physics
A 300 kg piano slides 4.4 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. (a) Calculate the magnitude of the force exerted by the man.
asked by Hope 
Physics
What is the minimum work needed to push a 1075 kg car 230 m up along a 17.5° incline? (a) Ignore friction. (b) Assume the effective coefficient of friction retarding the car is 0.30?
asked by Hope 
Math
The number of tickets sold each day for an upcoming performance of Handels Messiah is given by N(x)=0.4x^2+11.2x+13, where x is the number of days since the concert was first announced. When will daily ticket sales peak and how many tickets will be sold
asked by Pam 
Statistics
An instructor hy pothesizes that the mean of the final ex am grades in her statistics class is larger for the male students than that it is for the female students. The data from the final ex am for the last semester are presented here. Test her claim
asked by Anonymous 
Math  PreCalc (12th Grade)
Use the inverse matrix to solve this system of equations: 4x+3y=7.5 7x+9z=14 4yz=8.3 4,3,0 7,0,9 0,4,1
asked by Shawna 
math
A fruit seller bought m pears and twice as many mangoes. He also bought 10 fewer peaches than pears. Each pear cost RM 0.40 cents, each mango cost RM 0.50 cents while each peach cost RM 0.80. If the fruit seller paid RM 102. Find the value of m.
asked by doremi 
math
Rewrite the following equation in the centerradius form of the equation of a circle. x2  2x + y2 + 2y  2 = 0
asked by Elizabeth 
Statisics
To test the results of a conventional versus a new approach to the teaching of reading, 12 pupils were selected and matched according IQ, age, and present reading ability (there are 6 pairs!). One from each of the pairs was assigned to the conventional
asked by Walid 
Math  PreCalc (12th Grade)
The function f(x) = x2 − 5 is defined over the interval [0, 5]. If the interval is divided into n equal parts, what is the area of the kth rectangle from the right? A) [(2+k(5/n))^2+5](5/n) B) [(k(3/n))^2−5](5/n) C) [(k(5/n))^2+5](5/n) D)
asked by Shawna 
Health
a boy notices a special needs student sitting by himself during recess. How can he get the student involved in a meaningful way? a coach one of the teams b be the all time referee c the game be modified to allow for 2 goalies d the game be played by
asked by Stephen 
Math  PreCalc (12th Grade)
How many 4digit numbers are possible if the hundreds digit is 8 and if repetition of digits is allowed? A) 100 B) 1,000 C) 9,000 D) 900 E) 1,800
asked by Shawna 
Math  PreCalc (12th Grade)
The function f(x) = 6x + 5 is defined over the interval [1, 4]. If the interval is divided into n equal parts, what is the value of the right end point of the first rectangle?
asked by Shawna 
Chemistry
What is the pH of a solution prepared by mixing 24.6 g sodium acetate and 50 mL of 2.5 M acetic acid in a 500 mL flask and filling to volume
asked by Divine 
Algebra
6/z3=8/5 help please.
asked by Sierra 
Algebra
Find a quadratic equation that has the numbers below as solutions. 1. 1/2,10 2. 2/3,5/7 How do I even do these problems? Those solutions are so hard to find.
asked by Anonymous 
Biology
Exogenous treatment with the plant hormone, ABA or auxin, induces enhanced susceptibility against biotrophic pathogens. Design an experiment that can reveal whether these hormones use the same signalling pathway or independent pathways to induce
asked by Justin 
physics
explain why a flat sheet of paper and a sheet of paper crumpled into a ball which are dropped from a height of 2 meters will not accelerate at the same rate?
asked by rach 
IFSM
The chief information officer recommends that a new computer and software costing $100,000 be purchased and installed because it will decrease administrative costs by $4 per hour and management allocation by $2 per hour, resulting in a 10 percent increase
asked by Nana 
Math
if I have 1 defect in a batch of 54 widgets, what is my quality index?
asked by Jane 
Math
I know when you decrease the height of a cone by half that the volume decreases by half from plugging in the numbers in the formula. However, I don't how to explain in words why a decrease in height by half results in a decrease in the volume by half.
asked by Brandi 
mat116 algebra
15x4>3
asked by Sandy 
math
How do you find the area of a circle with a diameter of 26 feet???
asked by kim 
Social Studies
What is affirmative action?
asked by annonymous 
research
how did Epperson et al determine the validation of the MnSOSTR
asked by Anonymous 
math
How do you know 1 and 2/3 divided by 3 and 1/2 has to be less than 1/2, without calculating the quotient? Please explain :)
asked by Annette 
Science
Explain why residence time in the atmosphere for water is short but the flux in and out of the atmosphere is huge.
asked by Anonymous 
Science
Explain residence time in relationship to reservoirs and fluxes
asked by Anonymous 
math
write 3 out of 4 +4 out of 9 into a mixed number
asked by ariana l. collins 
Chemistry
The following reaction has the following standard thermodynamic parameters: Reaction: C(g) + D(g)> E(g) Delta H rxn=26.1kJ/mol and Delta S rxn=69.8J/(mol*K). Calculate the temperature at which the reaction becomes nonspontaneous.
asked by AAdd 
math
A cylinder can held 105 Liters of milk a) ignoring the thickness of the material calculate the volume of the cylinder in cm(cube).
asked by santoniann 
SEATTLE
Determine the volume of base ml needed to prepare the following 500 ml of 0.18 % NaOH SOLUTION USING A 10.0 % NaOH SOLUTION
asked by MH 
Business
All of the following are assets except A. inventory. B. patents. C. cash. D. bank loans.
asked by Pirurris 
Art  Help ASAP!!
how many years does it take to finish the course sculpture at OCAD university??
asked by Annie 
math
Please !!!! What can i write a letter about my math best teacher ..???
asked by Iqbal 
physics
Explain why voltage is constant when connecting resistance
asked by ogboyeb 
math help please
Let f:ℤ+ → ℤ+ be the function defined by: for each x ∈ ℤ+, f(x) is the number of positive divisors of x.  find integers m, n, and k so tha f(m)=3, f(n) = 4 anf !@#$%^&) = 5 is f oneto one? Explain, is f unto? prove is it true that all positive
asked by excel 
algebra
solve by factoring a^24ab8b^2?
asked by Besiane 
Math  PreCalc (12th Grade)
A fair coin is tossed 3 times in a row. If X is the number of heads counted, what is the mean of the probability distribution of X? A) 1.0 B) 1.5 C) 2.0 D) 2.5 E) 3.0
asked by Shawna 
Precalculus II
Find exactly all solutions in [0,2pi) to 4sin(x)cos(x) = 1
asked by Hfx 
precal
find exactly all the solutions in [0, 2pi) to 4 sin(x)cos(x) = 1
asked by hamal 
Math  PreCalc (12th Grade)
Which statement about a uniform probability distribution defined on a given interval is true? A) The mean is always 0. B) The mean is always 1. C) The standard deviation is always 1. D) The mean is the midpoint of the interval. E) The standard deviation is
asked by Shawna