Wednesday
October 22, 2014

Posts by MIKE


Total # Posts: 3,198

math-statistics
The following risk ratios give the increased risk for various diseases comparing two groups (exposed vs. unexposed). a. 2.5 (2.0, 3.0) b. 1.03 (1.02, 1.04) c. 6.0 (.85, 9.8) d. 0.98 (0.88, 1.08) e. 0.20 (.05, 1.05) Which risk ratios are statistically significant at the 0.05 ...
July 17, 2013

math
A box contains 5 blue and 4 red marbles. In how many ways can 4 marbles be drawn so as to include 2 red marbles?
July 17, 2013

Chemistry
The solubility of AgCl (s) is 2.5 x 10^-5 M. calculate the ksp
July 10, 2013

Statistics
The following risk ratios give the increased risk for various diseases comparing two groups (exposed vs. unexposed). a. 2.5 (2.0, 3.0) b. 1.03 (1.02, 1.04) c. 6.0 (.85, 9.8) d. 0.98 (0.88, 1.08) e. 0.20 (.05, 1.05) Which risk ratios are statistically significant at the 0.05 ...
July 9, 2013

Statistics
How would a histogram change if we increase the number of simulations? A. It would simply be more smooth. B. The p-value would get smaller. C. The standard error would get smaller. D. The distribution would be more similar to a T-distribution.
July 8, 2013

Statistics
The Centers for Disease Control (CDC) collects yearly statistics on drinking behavior in the United States by surveying a random sample of U.S. adults. The following data display the percent of adults aged 18 years and over who had 5 or more drinks in 1 day at least once in ...
July 8, 2013

venns diagrams
20
July 7, 2013

PHYSICS 2
An electron in an x-ray machine is accelerated through a potential difference of 1x10^4 V before it hits the target. What is the kinetic energy of the electron in electron volts?
June 30, 2013

Math
Find the largest possible degree n≤1000 of a polynomial p(x) such that: p(i)=i for every integer i with 1≤i≤n p(−1)=1671 p(0) is an integer (not necessarily 0).
June 18, 2013

Macroeconomics
(Monetary Policy and Aggregate Supply) Assume that the economy is initially in long-run equilibrium. Using an AD–AS diagram, illustrate and explain the short-run and long-run impacts of an increase in the money supply.
June 15, 2013

Calculus
A car leaves an intersection traveling west. Its position 5 sec later is 22 ft from the intersection. At the same time, another car leaves the same intersection heading north so that its position 5 sec later is 27 ft from the intersection. If the speed of the cars at that ...
June 13, 2013

Calculus
The total worldwide box-office receipts for a long-running movie are approximated by the following function where T(x) is measured in millions of dollars and x is the number of years since the movie's release. T(x) = (120x^2)/(x^2 + 4) How fast are the total receipts ...
June 13, 2013

Calculus
Suppose f and g are functions that are differentiable at x = 1 and that f(1) = 2, f '(1) = -1, g(1) = -2, and g '(1) = 3. Find the value of h '(1). h(x) = (x2 + 11) g(x) h '(1) =
June 13, 2013

Calculus
The relationship between the amount of money x that Cannon Precision Instruments spends on advertising and the company's total sales S(x) is given by the following function where x is measured in thousands of dollars. S(x) = -0.002x3 + 0.9x2 + 4x + 500 (0 x 200) Find the ...
June 13, 2013

Calculus
The demand function for the Luminar desk lamp is given by the following function where x is the quantity demanded in thousands and p is the unit price in dollars. p = f(x) = -0.1x2 - 0.3x + 39 (a) Find f '(x). f '(x) = (b) What is the rate of change of the unit price ...
June 13, 2013

Calculus
Find the points on the graph of f where the tangent line is horizontal. f(x) = x3 - 15x2 (x, y) = ( , ) (smaller x-value) (x, y) = ( , ) (larger x-value)
June 13, 2013

Calculus
Find the slope and the equation of the tangent line to the graph of the function f at the specified point. f(x) = -8/5 x^2 + 7 x + 7;(-1, -8/5) slope tangent line y =
June 13, 2013

Calculus
Let f(x) = 4x5/4 + 10x3/2 + 9x. Find the following. (a) f '(0) = (b) f '(16) =
June 13, 2013

spanish
luke y renato / venir / a tu casa / para escuchar música nosotros / poder / almorzar / con lori y roberto thad y lorenzo / preferir / salir / con sus amigos berta y amanda / querer / almorzar / en el parque can someone help i am lost i have to put these words in to ...
June 11, 2013

Accounting
Samuels, Inc. reported net income for 2011 is $105,000. During 2011 the company had 5,000 shares of $100 par, 5% preferred stock and 20,000 of $5 par common stock outstanding. Samuels’ earnings per share for 2011 is A.$4.00 B.$5.25 C.$6.50 D.$5.00
June 9, 2013

Accounting
On April 1, 2011, Albert Company purchased $50,000 of Tetter Company’s 12% bonds at 100 plus accrued interest of $2,000. On June 30, 2011, Albert received its first semiannual interest. On February 1, 2011, Albert sold $40,000 of the bonds at 103 plus accrued interest. ...
June 9, 2013

Accounting
Available-for-sale securities are securities that management expects to sell in the future, but are not actively traded for profit. A.True B.False
June 9, 2013

Accounting
Ruben Company purchased $100,000 of Evans Company bonds at 100 plus $1,500 in accrued interest. The bond interest rate is 8% and interest is paid semi-annually. The journal entry to record the receipt of interest on the next interest payment date would be: A.Debit: Cash $4,...
June 9, 2013

Accounting
When long-term investments in bonds are sold before their maturity date, the seller deducts any accrued interest since the last interest payment date from the selling price. A.True B.False
June 9, 2013

Accounting
Jacks Corporation purchases $200,000 bonds plus accrued interest for 2 months of $2,000 from Kennedy Company on March 1. The bonds have an annual interest rate of 6% payable on June 30 and December 31. The entry to record the purchase of the bonds would include: A.Interest ...
June 9, 2013

Accounting
Which of the following is not a part of comprehensive income? Answer foreign currency items restructuring charges unrealized gains and losses pension liability adjustments
June 9, 2013

physics
I have another question for the problem below, so What is the speed of the car just before it lands safely on the other side? would it be the same 38.6 meters/sec A 10,000N car comes to a bridge during a storm and finds the bridge washed out. The 650-N driver must get to the ...
June 4, 2013

physics
I have another question for the problem below, so What is the speed of the car just before it lands safely on the other side? would it be the same 38.6 meters/sec A 10,000N car comes to a bridge during a storm and finds the bridge washed out. The 650-N driver must get to the ...
June 4, 2013

physics
I have another question for the problem below, so What is the speed of the car just before it lands safely on the other side? would it be the same 38.6 meters/sec A 10,000N car comes to a bridge during a storm and finds the bridge washed out. The 650-N driver must get to the ...
June 4, 2013

UK Taxation
OPPA is the controlling shareholder and managing director of GANGNAM Ltd, un unquoted trading company that provides support services to the oil industry OPPA disposed of the following assets during the tax year 2009-10 1. On 8 April 2009 OPPA sold five acres of land to GANGNAM...
June 2, 2013

eDX
8.8279928732e-20 you're welcome guys
May 30, 2013

eDX
If the diffusivity is observed to double when the temperature increases by 10⁰ C, what is the activation energy for diffusion?
May 30, 2013

Chemistry
I was able to find both the Mol Frac and m now. The only problem is w/w. m) (40.0gNaCl)*(1molNaCl/58.33gNaCl)=.684mol Nacl -200.0gH20*(1molH20/18.02gH20)=11.mol H20 -200g= .2L ** .684mol NaCl/.2LH20= m=3.42 Mol Frac) .864molNaCl/(.864molNaCl+11.02)= .580 w/w .684/11.02= 3.63
May 24, 2013

Chemistry
Dr.Bob, Could you please show the work for w/w and mol frac. I continue to get a completely bizarre number. The only one that I am getting correct is the molal part.
May 24, 2013

Chemistry
A solution contains 40.0 g of sodium chloride and 200.0 g of water. Calculate the NaCl concentration as a a) mass percentage, b) molality, c) mole fraction. I have trouble finding mole fraction. I believe I've got the other two, but I'm not 100% sure.
May 24, 2013

Chemistry
Calculate the osmotic pressure at 22 °C of a 0.25 M solution of a) dextrose, b) magnesium chloride.
May 24, 2013

Math
Is this correct? Mode 7, median 7, range 15
May 23, 2013

Math
What is the mode, median, range for: 2,2,4,4,7,7,7,11,12,17
May 23, 2013

statistics
100 explanation 600*1/6=100
May 20, 2013

statistics
You can't do nothing about stop them cheating , but you have fun leading them in the wrong direction? This makes you feel better than them? :))))...don't you feel it's something wrong?
May 18, 2013

statistics
there are 3 reasons for which you do not understand this easy statistic issue: -teacher did not explained you well enough( which I doubt) -you are not attentive(which is most likely) -you are not accurate or you jump directly on seeking answers,without a complete judgement of ...
May 18, 2013

statistics
D)The statistical standard deviation Sigma is the square root of the variance; the variance is described as the average difference from the mean. How far is each data point from the mean? 1-0=1 1-0=1 -1-0=-1 -1-0=-1 0-0=0 0-0=0 (1^2+1^2+(-1)^2+(-1)^2+0^2+0^2)/6=4/6=2/3 sqrt(2/...
May 18, 2013

Calculus
An object is traveling along the x axis so that its speed is given by v(t)=t^2-7t+10 m/s. (a) Find the times when the object is at rest. (b) Find the acceleration at both of these times. Interpret the acceleration in terms of the motion of the object, ie whether the object is ...
May 15, 2013

Chemistry
Is there a difference between SiO2(aq) and H4SiO4?
May 15, 2013

math
0.2(x+30)-0.03(x-40)=17.4
May 14, 2013

precalculus
solve equation for solutionn over interval [0,360): cot(è)+4csc(è)=5
May 13, 2013

precalculus
solve equation for solutionn over interval [0,360): cot(è)+4csc(è)=5
May 13, 2013

English - Poetry
Here is a copy of the poem: My children play with skulls for their classrooms are guarded by warlocks who scream at walls collapsing into paper toilets plump witches mouth ancient curses in an untaught tongue test children upon their meaning assign grades in a holocaust ...
May 10, 2013

English - Poetry
What does Audre Lorde's poem School Note mean? Most notably, what does the last stanza, "My children play with skulls/ and remember / for the embattled / there is no place / that cannot be / home / nor is."?
May 10, 2013

Discrete Math
Let f : R R→Z be the closed binary operation defined by f (a, b) _ _a + b_. (a) Is f commutative? (b) Is f associative? (c) Does f have an identity element?
May 8, 2013

Math
Is 72.98 = 72.980 my answer is true.. Is it correct?
May 7, 2013

Chemistry
Assuming equal concentrations, rank these aqueous solutions by their freezing point: low to high NH4Cl, Sn(ClO3)4, Na2SO4, and AlBr3.
May 4, 2013

chemistry
find the molar solubility of zinc carbonate if its ksp=1.5x10^-10. (at 298K)
May 4, 2013

math
If the length of a rectangle is 4 more than 3 times the width, and the perimeter is 32 meters, what are its dimensions? Please enter your answer as two numbers without the units, separated by a comma.
May 1, 2013

statistics
a quiz consists of 30 true or false questions. if the student guesses on each question, what is the standard deviation of the number of correct answers
April 29, 2013

Physics
A ceiling fan starting from rest reaches an angular velocity of 30 rev/sec in 5 sec. What is the angular displacement of the fan during these 5 sec? Can you show me the steps need to figure this question out? Thanks!
April 24, 2013

Physics
A drawbridge with a weight of 5000 N is supported by a hinge and rope and is in static equilibrium. The length of the drawbridge is 5 m and the rope is attached to the draw bridge a distance of 4 m from the hinge. What is the tension force rope provides? Can you show me steps ...
April 24, 2013

math
I'm sorry, but I don't think this is possible since 999 + 999 = 1098 (even the sum of the largest possible three-digit numbers do not give us a large enough total. 104 x 162 = 16848 (not sure if you wanted a "product?" I found this by trial and error with a ...
April 22, 2013

math
there are 9 candidates running for 3 seats....how many different election results are possible
April 22, 2013

Calculus
Find the exact area below the curve y=x^3(4-x)and above the x-axis
April 21, 2013

Chemistry
Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ÄH = -81.5 kJ A 10.4-g sample of CaCl2 is dissolved in 102 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and ...
April 18, 2013

Java programming
can u give me some example of withdrawal money program using array to store ten information of user. including the attributes: (i) Name of the depositor (ii) Account number (iii) Type of account (iv) Balance amount And the methods: (i) Deposit (ii) Withdraw (iii) Display the ...
April 18, 2013

math
Your store’s average basket (transaction) size for the month of March was $11.50 and you believe the average basket size will remain the same for your store in April. One of your hourly employees had an average basket size of $9.00 for the month of March and averaged 125 ...
April 18, 2013

math
not sure confused
April 13, 2013

math
Suppose A is the set of students registered at the University of Calgary, and C is the set of courses currently being offered at the University of Calgary. Under what conditions is each of the following a function? a) {(a, c) | a’s first class each week is in c} b) {(a, c...
April 13, 2013

English
Having problems with a introductory sentence. Its a essay on dying and living. I wrote a question to start my intro. Sentence. Or I wrote The professor died in 1974 of Cancer. Someone please let me know if I started out right. Please
April 12, 2013

social science statistics
a professor was curious to whether the students in a very large class she was teaching who turned in their first scored differently from the overall mean on the test.The overall mean score on the test was 75 with a standard deviation of 10;the score were approximately normally...
April 9, 2013

english
the couple ordered ___ for hors d'oeuvres at the wedding a)pumpkin pie b)cake c)soup d)stuffed mushrooms?
April 4, 2013

algebra
If a pendulum is 30 feet long what is the period of the pendulum in seconds with function l = 0.81t^2
April 4, 2013

MATH please help
An object at rest begins moving horizontally on the x-axis, starting at position x(t) = 0 feet at time t = 0 seconds.Suppose, after exactly 2 seconds we measure the position of the object to be 3 feet to the right of the origin AND measure the object to be moving to the ...
April 3, 2013

Math
1. Number sense. Could the frozen yogurt survey help restaurants choose flavors of frozen yogurt? Explain. 2. Give an example of a topic for a survey question where the results for the answers could be similar.
April 1, 2013

physics
Two racquetballs, each having a mass of 200 g, are placed in a glass jar as shown in in the figure below. Their centers lie on a straight line that makes a 45° angle with the horizontal.
March 31, 2013

calculus
A potter forms a piece of clay into a right circular cylinder. As she rolls it, the height h of the cylinder increases and the radius r decreases. Assume that no clay is lost in the process. Suppose the height of the cylinder is increasing by 0.5 centimeters per second. What ...
March 31, 2013

Math
What is greater -19 or -17?
March 25, 2013

algebra
In 2000, the average family net worth was $360,000 and there were about 7.7x10^7 families. Calculate the total family net worth in 2000.
March 20, 2013

Math
Which shows 18.64 rounded to the nearest tenth? My answer is 18.6 is this correct
March 18, 2013

Chem
What is the specific heat in J/g Celsius for a metal sample with a mass 95.6 g which absorbs 841 J of energy when it's temperature increases from 30.0 degrees Celsius to 98.0 degrees Celsius?
March 18, 2013

Chem
What is the specific heat in J/g Celsius for a metal sample with a mass 95.6 g which absorbs 841 J of energy when it's temperature increases from 30.0 degrees Celsius to 98.0 degrees Celsius?
March 18, 2013

Chem
What is the specific heat in J/g Celsius for a metal sample with a mass 95.6 g which absorbs 841 J of energy when it's temperature increases from 30.0 degrees Celsius to 98.0 degrees Celsius?
March 17, 2013

maths
When conducting an inferential statistical analysis, and applying a conventional “critical p- value” of .05, the odds of making a Type I Error and “rejecting a true Null Hypothesis” is…?
March 17, 2013

AP Chemistry
Ohhhh, that makes sense! Thanks!
March 16, 2013

AP Chemistry
A biochemist prepares a lactic acid-lactate buffer by mixing 225 mL of 0.85M lactic acid with a Ka=1.38*10^-4 with 435mL of 0.68M sodium lactate. What is the buffer pH? I know I have to use the equilibrium constant expression, but I'm pretty lost from there. Can someone ...
March 16, 2013

math
sonya spent three eighth of her money and then had $15 left. how much money did she originally have
March 16, 2013

Math
0.9 x 2 or 2 + 0.9
March 14, 2013

Math
Which is greater 0.9 x 2 or 2 + 9? My answer is 0.9 + 2 is greater because it equals 2.9 and 0.9 x 2 = 1.8.. Is this correct?
March 14, 2013

Chemistry
thnk u so much
March 14, 2013

cHEM
i got 114.5 is this right?
March 14, 2013

cHEM
It is found that 1.431 g of element X contains 7.509 × 1021 atoms. The atomic mass of X is?
March 14, 2013

Math/230
A 350 word response how to compute probabilities using z score
March 14, 2013

Chemistry
What is the change in enthalpy when 17.0 g of liquid mercury is heated by 31°C?
March 12, 2013

Physics
A force is applied to a door at an angle of 56.8° and 0.34 m from the hinge. a) What force produces a torque with a magnitude of 2.18 N·m? b) How large is the maximum torque this force can exert?
March 12, 2013

english
what's an example of an appostion in the book Miracle Worker?
March 10, 2013

algebra
an investment of $50,000 was made by a busines club. the investment was split into three parts and lasted for one year.the first part of the investment earned 8% interest, the second 6%, and the third 9%. total interest from the investments was $3960. the interest from the ...
March 6, 2013

Physics
A car is travelling along a highway with a speed of 25 m/s when the driver sees an obstruction 1.80*10^2 m directly ahead. It takes the driver 0.80s to react and begin braking. a) How far does the car travel before it begins to slow down? b) How long will it take the car to ...
March 4, 2013

Physics
In a target shooting game, wooden blocks are thrown into the air and shot in flight. A block of 0.8kg has a speed of 10 m/s at the top of its trajectory when it is hit by a bullet from below at an angel 60° from horizontal. The mass of the bullet is 5.0 g and its speed is ...
March 4, 2013

Physics
In a target shooting game, wooden blocks are thrown into the air and shot in flight. A block of 0.8kg has a speed of 10 m/s at the top of its trajectory when it is hit by a bullet from below at an angel 60° from horizontal. The mass of the bullet is 5.0 g and its speed is ...
March 4, 2013

Calculus
Thank you
March 3, 2013

Calculus
Find the tangent line approximation for sqrt(3+x) near x=0.
March 3, 2013

Calculus
Find the derivatives of the function f(t)=cosh^2(4t)-sinh^2(4t). Simplify your answer completely.
March 3, 2013

Chemistry
What is the complete and net ionic equations for: Cu+Zn+2HCl--> ZnCl2+Cu+h2
March 1, 2013

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