Saturday
December 20, 2014

Posts by jeffrey


Total # Posts: 46

College physics
When a 0.15 kg baseball is hit, it approaches the bat with a speed of 20 m/s and undergoes an elastic collision. (a) What is the impulse delivered to the bat by the ball? (b) If the baseball is in contact with the bat for 1.3 ms, what is the average force exerted by the bat on...
October 24, 2014

Math
If 2 1/3 feet of silver ribbon cost $.21, how much will 9 feet cost
June 13, 2014

math
Michael and mateo begin running around a circular track from the starting point at the same time. it takes Michael 48 seconds one lap around the track. it takes mateo 60 seconds to complete one lap around the track how many minutes does it take before the two boys will meet at...
December 15, 2013

Statistics
Thank you, but I'm still confused. So is there not enough info to answer this question? Thank you for your time.
October 28, 2013

Statistics
A city ballot includes a local initiative that would legalize gambling. The issue is hotly contested, and two groups decide to conduct polls to predict the outcome. The local newspaper finds that 53% of 1200 randomly selected voters plan to vote "yes," while a ...
October 28, 2013

Statistics
A city ballot includes a local initiative that would legalize gambling. The issue is hotly contested, and two groups decide to conduct polls to predict the outcome. The local newspaper finds that 53% of 1200 randomly selected voters plan to vote "yes," while a ...
October 27, 2013

Statistics
In 1998 a San Diego Reproductive clinic reported 49 live births to 207 women under the age of 40 who had previously been unable to get pregnant. Using the 90% confidence interval calculated above, would it be misleading for the clinic to report a success rate of 25%? A) Yes, ...
October 27, 2013

calculus
The function is x^3+6x^2/x^2+36.
May 29, 2013

calculus
For the function r(x)=x3+6x2x2−36, find the following. a. the y - intercept b. the x - intercepts c. all horizontal asymptotes. y = d. all vertical asymptotes. x =
May 29, 2013

math x
8. The Chicago Public School system has about 680 schools. About 130 of the schools will be closed. If five schools are chosen at random find the probability that at least 3 of them will be closed.
April 3, 2013

chemistry
thanks, sorry, 10ml of the unknown mixture was titrated methyl orange was used it took 7.5ml of 1M HCl (.0074Mol ?) so this means .00074Mol CH3NH2 / ml ?
August 24, 2012

chemistry
Q: Calculate the unknown molar concentration of CH3NH2 in MeOH titrated against a known molar concentration of HCl ? Could you please answer this, there are lots of examples around calculation PH of two known's but not so much of unknown concentration. thankyou.
August 24, 2012

pre algebra
the ratio of boys to girls in an art class is 3.5. there are 12 boys in the class. how many girls are in the class?
October 4, 2011

calculus
A spherical balloon is being inflated so that its volume is increasing at the rate of 200 cm3/min. At what rate is the radius increasing when the radius is 15 cm.
July 31, 2011

math
A balloon rises at a rate of 3 meters per second from a point on the ground 30 meters from an observer. Find the rate of change of the angle of elevation (in radians per second or rad/sec) of the balloon from the observer when the balloon is 30 meters above the ground.
July 25, 2011

math
A right circular cylinder is to be designed to hold 750 cm3 of processed milk, and to use a minimal amount of material in its construction. Find the dimensions for the container.
July 25, 2011

math
A cardboard box manufacturer wishes to make open boxes from rectangular pieces of cardboard with dimensions 40 cm by 60 cm by cutting equal squares from the four corners and turning up the sides. Find the length of the side of the cut-out square so that the box has the largest...
July 25, 2011

physics
static friciton is greater than sliding friction prove
July 19, 2011

Science
dilute
May 19, 2011

7 Mathematics
A team of 4 golfers scored 69,73,70, and 74 on the first round on a par 72 course. They reduced their team score by 3 on the second round. a) How many strokes above or below par was the team score on the first round? b) How many strokes about or below par was the team score on...
May 16, 2011

Probability as a Fraction
In a bag there are 7 red tiles, 3 blue tiles, and 2 purple tiles. How many and what color tiles would you have to add to the bag so that the probability of picking red is 1/3?
April 24, 2011

Chemistry
thanks saizad
April 17, 2011

math
Given the following equation x,y data pairs find the least squares equation for these data. Use 3 decimal places. Y equals what + what x(3,3)(4,5)(6,8,)
January 19, 2011

math
given the following equations x,y data pairs find the least squares equation fo these data. use 3 decimal places. Y equals what + what x (3,3)(4,5)(6,8)
January 19, 2011

Technology
Would the president of a technologies workers union be considered a stakeholder for a telecommunication company?
January 6, 2011

Physics
A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 245 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.7 m/s relative to the shore, and then hops onto an identical floating log that is ...
November 14, 2010

thesis statement
whats a good thesis statement on cooking
August 30, 2010

algebra
thank you
August 25, 2010

algebra
this tells me to rewrite the expression using the distributive property and then simplify plz help me and show me the work here are the questions. 15(f+1/3) 16(3b-0.25) (c-4)d
August 25, 2010

CHEMISTRY
A 31.43 mL volume of 0.108 M NaOH is required to reach the phnolphthalein endpoint in the titration of a 4.441 g sample of vinegar. Calculate % acetic acid in the vinegar.
August 25, 2010

JJ
A 30.84 mL volume of 0.128 M NaOH is required to reach the phnolphthalein endpoint in the titration of a 5.441 g sample of vinegar. Calculate % acetic acid in the vinegar.
August 25, 2010

CHEMISTRY
Assuming the density of a 5% acetic acid solution is 1.0 g/mL,determine the volume of the acetic acid solution necessary toneutralize 25.0 mL of 0.10M NaOH.
August 25, 2010

stats
Among the contestants in a competition are 44 women and 26 men. if 5 winners are randomly selected, what is the probability that they are all men?
July 14, 2010

Pre algebra
y/2 - 5y/6 + 1/3=1/2
May 8, 2010

CHEMISTRY
In some solid calcium carbonate samples, calcium bicarbonate, Ca(HCO3)2, is also present. Write a balanced euation for its reaction with hydrochloric acid.
March 8, 2010

algebra
I need help!!! 3/2,1/2, 1/6,1/8,... I need to determine if this sequence is arithmetic, geometric, or neither, then I need to find the ninth term
April 19, 2009

algebra
I need help!!! 3/2,1/2, 1/6,1/8,... I need to determine if this sequence is arithmetic, geometric, or neither, then I need to find the ninth term
April 19, 2009

social studies
how does enginering use math
October 26, 2008

Chemistry- Stochiometry
The conversion factor for deriving the number of moles of salicylic acid, C7H6O3, from a given number of grams of salicylic acid is...
February 28, 2008

Honors Geometry
Okay. I figured the problem out now. Thanks for your help!
January 18, 2008

Honors Geometry
Okay, the ITT is If a triangle has two congruent sides, then the angles oppositeof those sides are congruent
January 18, 2008

Honors Geometry
hmm.. okay, but i'm not really seeing how that goes with the ITT
January 18, 2008

Honors Geometry
I'm stuck on these 2 problems. My Geometry teacher won't help me. What is the inverse of the Isosceles Triangle Theorem (ITT)? What is the contrapositive of the Isosceles Triangle Theorem (ITT)?
January 18, 2008

chemistry
Could someone help me with this please? In chemistry, we did a lab in which he put brands of commerical vinegar in a microplate. We put in 10 drops of each vinegar in each plate thinger then we added 1 drop of phenolphthalein and then put in as many drops of NaOH as it took to...
May 14, 2007

Social Studies
Is there a desert in Italy? http://www.google.com/search?q=map+italy&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA Nope. =)
April 23, 2007

Economics
Determine whether each of the following would cause a shift in the aggregate demand curve, the aggregate supply curve, neither, or both. Which curve shifts, and in which direction? What happens to aggregate output and the price level in each case? a. The price level changes b...
September 6, 2006

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