Saturday
December 20, 2014

Posts by Jon


Total # Posts: 1,259

Science
Assume that you have 15ml of 2.5M potassium hydroxide but only have concentrated bottle of 16M strength. How would you obtain this
December 17, 2014

algebra
a train travels 600 miles from Los Angles to San Francisco traveling at a certain speed the return trip is made traveling 40 mph faster the return time is 4 less how fast was the train traveling in each direction?
October 19, 2014

Calculus
Solve the following e^-x (square root((3e^2x) - 5/4)) = e^x
September 29, 2014

physics
A football is kicked off with an initial speed of 65 ft/s at a projection angle of 45 degrees. A receiver on the goal line 63 yd away in the direction of the kick starts running to meet the ball at that instant. What must be his minimum speed (in feet/second) if he is to catch...
September 28, 2014

math
Find a scalar equation of the plane that contains the given point P=(-3,-3,1)and the given normal vector n = (-1,4,7)
September 24, 2014

AP Chemistry
Form 300 mL of 0.25 M Copper 2 sulfate pentahydrate
September 17, 2014

Math
A waiter made $120 in tips after waiting on 6 tables. What was the waiter's average tip per table?
September 12, 2014

Physics
A commuter backs her car out of her garage with a constant acceleration of 1.40 m/s2. (a) How long does it take her to reach a speed of 1.60 m/s? s (b) If she then brakes to a stop in 0.8 s, what is her (constant) deceleration? m/s2
September 10, 2014

english
Which one of the following sentences includes a prepositional phrase? B. Terry and Rowena met Craig at the mall.
August 19, 2014

History
If you goto chapter 20 you can see how the lighter skinned Rosa and Jane treat Topsy and talk about darker slaves in general.
July 19, 2014

math
80% of the American population likes pizza. If 8 Americans are chosen at random, find the probability that 6 of them like pizza.
June 28, 2014

scienc
Mass of a bick
June 8, 2014

physics
With a magnetic field perpendicular to a single 13.2 cm diameter circular loop of copper wire decreases uniformly from .670 T to zero. If the wire is 2.25 mm in diameter how much charge moves past a point in the coil during this operation?
April 28, 2014

Chemistry
Would x equal .114?
April 16, 2014

Chemistry
Thank you, but I have one more question. In your solution, wouldn't the equilibrium constant equation be [HI]^2 / [H2][I2] Wouldn't HI be the product and H2 and I2 be the reactants?
April 16, 2014

Chemistry
An equilibrium mixture in a 10.0 L flask contains 7.0 mol HI(g) and 1.0 mol each of I2(g) and H2(g). If 2.5 mol H2, 5.0 mol I2 and 2.0 mol HI are added to that equilibrium mixture how many moles of each gas will be present when equilibrium is reestablished?
April 16, 2014

PHI 208 Week 3 Reading Quiz
According to Kant, persons: CORRECT are both A and B. Milton Friedman argues that even if the corporate executive were justified in funding social causes with his/her corporation’s profits, he/she could not achieve the success of such social causes because: CORRECT All ...
April 6, 2014

finance
A bond that has a $1000 par value (face value) and a contract or coupon interest rate of 11.1%. The bonds have a current market value of $1125 and will mature in 10 years. The firms marginal tax rate is 34%. The cost of capital from this bond debt is what percent? (round to ...
April 3, 2014

Physics
A toy dart gun has a spring with a spring constant of 315 N/m. An 12 gram dart is loaded in the gun and the spring is compressed a distance of 7.8 cm and then shot into the air. When the dart is 5.8 meters high in the air, what is its speed? If the maximum height the dart can ...
March 31, 2014

math
If a new home can be constructed for $160,000, what is the opportunity cost of federal defense spending, measured in terms of private housing? (Assume a defense budget of $700 billion.)
March 23, 2014

probability
We have two fair three-sided dice, indexed by i=1,2. Each die has sides labelled 1, 2, and 3. We roll the two dice independently, one roll for each die. For i=1,2, let the random variable Xi represent the result of the ith die, so that Xi is uniformly distributed over the set...
February 27, 2014

probability
Given that there were 4 Heads in the first 7 tosses, find the probability that the 2nd Heads occurred at the 4th toss. Give a numerical answer.
February 27, 2014

algebra I
drop a ball at 30000 feet at 30 feet per second and a ball bounces up at 40 feet per second what height do they meet and what speed
February 16, 2014

Physics
A car is traveling at 16.0 m/s, and the driver sees a traffic light turn red. After 0.500 s (the reaction time), the driver applies the brakes, and the car decelerates at 8.00 m/s2. What is the stopping distance of the car, as measured from the point where the driver first ...
January 24, 2014

Physics
A uniform beam of weight 245 N, and length L, sticks out from a vertical wall. A lightweight cable connects the end of the beam to the wall, making an angle of 65.0° between the beam and the cable. What is the tension in the cable?
December 3, 2013

Math
P(x) = (2x^3+x^2-18x-9)/(x^2-x-6) 1.Find any holes in the graph of P(x) 2.Find any horizontal or oblique asymptote 3.Determine where it crosses the horizontal/oblique asymptote (if it does)
November 29, 2013

statistics
I think I have it...nevermind .94 on z chart =1.55...then multiply 1.55 times error (10) then time 60=75.5?
November 24, 2013

statistics
Typing speeds among college students are normally distributed with a mean of 60 words, and a standard deviation of 10 words. determine the typing speed that separates the top 6% typists from the rest.
November 24, 2013

Statistics
142 out of 507 people were right. Calculate a 95% confidence interval for the proportion of the entire population that could be right. I did some of the work …Please help. I am getting .0199 SD =sqt(.28(1-.28)/506 = .0119 so .28 +/- .0119 so I could say that with 95% ...
November 24, 2013

Statistics
I get it now...I was missing a step too! Thanks Much!
November 24, 2013

Statistics
you know I am getting .0199 SD =srt(.28(1-.28)/506 = .0119? Please check for me again?
November 24, 2013

Statistics
so I could say that with 95% confidence, between 24.1% and 31.9% of the entire population could be right?
November 24, 2013

Statistics
142 out of 507 people were right. Calculate a 95% confidence interval for the proportion of the entire population that could be right. I did some of the work and got .72...don't know what to do with this? Please help.
November 24, 2013

Trigonometry
a 100 pound box hangs between two ropes T1 and T2 the angle at the top of T1 is 28 degrees and the angle at the top of T2 is 35 degrees. what does T1 and T2 equal? Must show work
November 15, 2013

Trigonometry
A box is on a 10 degree incline with 180 pounds of force against the box. What is the weight of the box?
November 15, 2013

Physics - PLEASE HELP
A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000 N is applied to the end to stretch the rod by 1.00 mm. What is the tensile modulus for this rod? 7.50 × 1011 N/m2 8.70 × 1011 N/m2 9.78 × 1011 N/m2 10.2 × 1011 N/m2 10.8 × 1011 N/m2
November 10, 2013

Algebra 2
In triangle FGH, the measure of angle G is three times that of angle F. The measure of angle H is 20 degrees more that that of angle F. Find the angle measures
October 10, 2013

english
Can someone check my english essay. 700 words. I have English as 2nd language
September 20, 2013

Chem still confused
1.) A biochemistry student wants to make 4 liters of a phosphate solution using 48.6 g Na2HPO4 (FW=141.96) What is the concentration of this solution? 2. When she reaches the storeroom she finds that there is no Na2HPO4, however there is a bottle of hydrate Na2HPO4 * 7H20. (FW...
September 16, 2013

Chem wondering how to set it up
I'm actually still confused by this
September 16, 2013

Chem wondering how to set it up
1.) A biochemistry student wants to make 4 liters of a phosphate solution using 48.6 g Na2HPO4 (FW=141.96) What is the concentration of this solution? 2. When she reaches the storeroom she finds that there is no Na2HPO4, however there is a bottle of hydrate Na2HPO4 * 7H20. (FW...
September 16, 2013

finance
A thirty-year U.S. Treasury bond has a 4.0 percent interest rate. In contrast, a ten-year treasury bond has an interest rate of 3.7 percent. If inflation is expected to average 1.5 percentage points over both the next ten years and thirty years, determine the maturity risk ...
July 28, 2013

Physics
2_2_3 v(x)= (q_0*(L^4-x^4)/(24*L))/(46/4*E_0*pi*R_0^4)
July 27, 2013

Physics
2_2_1 -q_0*x^3/(6*L) Q2_2_2 23/2*R_0^4*E_0*pi Q2_2_3 -(q_0*x^3/(6*L))/(46/4*E_0*pi*R_0^4) V(x)???? Q2_2_4 -5.82 Q2_2_5 50.9 305.6
July 27, 2013

Physics
please any one 2_1_1 and 2_2_3 v(x) Thanks!!
July 27, 2013

statistics
There is a table of AVERAGE monthly temperatures of two different areas of the same city. A scatterplot of the data is made to show that the relationship is linear between the two. If raw data was used instead of the averages to make the scatterplot, the correlation ...
July 3, 2013

MIT 2.01X
8_2_1 320N/m
July 3, 2013

MIT 2.01X
Thanks, you have any response?
July 3, 2013

MIT 2.01X
help please
July 3, 2013

MIT 2.01X
I'm trying to solve it
July 3, 2013

MIT 2.01X
HW8_4_1 : Ymax= h/2
July 3, 2013

Mechanics/Physics
HW 7_2_2 576 -576 281.33 -281.33 HW 7_3_1 -p*x
June 30, 2013

Physics
A thin massless horizontal pipe rotates about a vertical axis with angular speed ω as shown in the figure. A small bug, located at a distance r from the axis, starts crawling inside the pipe at constant speed v (relative to the pipe). Because of the bug, the motor must ...
June 18, 2013

simplifying
(3b)^3
May 25, 2013

chemistry
determine the number of representative particles in each of the following and identify the representative particle: 11.5 mol Ag; 18.0 mol H20; 0.150 mol NaCL.
May 6, 2013

chemistry
pb I pbcl2 I cl- II cl- I agcl I ag
May 5, 2013

math
point
May 2, 2013

Algebra
simplify k+5 _____ 30k _______ 5k-1 _____ 6k
March 26, 2013

math
At the beginning of a basketball game, the referee tosses the ball vertically into the air. Its height, h, in feet after t seconds is given by h(t) = -16t2 + 24t +5. During what time interval (to the nearest tenth of a second) is the height of the ball greater than 9 feet?
March 25, 2013

Math
512
March 24, 2013

physics
1.986
March 18, 2013

statistics
The mean of nonresidential buildings is 30 years and the standard deviation of the ages of the buildings is 5 years. Determine the probability that a random sample of a group of 50 nonresidential buildings will have a mean age of less than 27.5 years.
March 17, 2013

Physics
I think we are in the same class, 'cause I'm working on this problem also...
March 17, 2013

Algebra
The recommended daily intake (RDI) of a nutritional supplement for a certain age group is 600 mg/day. Actually, supplement needs vary from person to person. Write an absolute values inequality to express the RDI plus or minus 50 mg and solve it.
March 15, 2013

Algebra
1/5x - 3 = 1/2x - 1/5x What's the ?
March 15, 2013

Algebra
Solve |4y – 3| > 8
March 14, 2013

Algebra
Solve 0.17y + 0.03(y + 9000) = 870
March 14, 2013

Algebra
Solve 1/5x - 3 = 1/2x - 1/5x
March 14, 2013

Algebra
Solve |6 - 4x| < -13
March 14, 2013

Algebra
The recommended daily intake (RDI) of a nutritional supplement for a certain age group is 600 mg/day. Actually, supplement needs vary from person to person. Write an absolute values inequality to express the RDI plus or minus 50 mg and solve it.
March 14, 2013

PLEASE HELP!!!
thanks I think I finally figured it out
March 5, 2013

PLEASE HELP!!!
Jon and Melissa agree to meet in Chicago for the weekend. Jon travels 236 miles in the same time that Melissa travels 224 miles. If Jons rate of travel is 3 mph more than Melissas, and they travel the same length of time, at what speed does Jon travel?
March 5, 2013

Algebra
Chuck and Dana agree to meet in Chicago for the weekend. Chuck travels 236 miles in the same time that Dana travels 224 miles. If Chuck’s rate of travel is 3 mph more than Dana’s, and they travel the same length of time, at what speed does Chuck travel?
March 5, 2013

Algebra
A store mixes Kentucky bluegrass worth $11 per pound and ryegrass worth $14 per pound. The mixture is to sell for $13 per pound. Find out how much of each should be used to make a 588 pound mixture. How many pounds of the Kentucky bluegrass should be in the mixture?
March 5, 2013

Algebra
Chuck and Dana agree to meet in Chicago for the weekend. Chuck travels 236 miles in the same time that Dana travels 224 miles. If Chuck’s rate of travel is 3 mph more than Dana’s, and they travel the same length of time, at what speed does Chuck travel?
March 5, 2013

Algebra
Soybean meal is 16% protein; cornmeal is 8% protein. How many pounds of each should be mixed together in order to get 320-lb mixture that is 10% protein?
March 5, 2013

Algebra
Joan Arlington has twice as much money invested at 5% simple annual interest as she does at 4%. If her yearly income from the two investments is $378, how much does she have at each rate?
March 5, 2013

Algebra
Two of the top-grossing concert tours were by a jazz band and a rock band. Together the two tours visited 178 cities. The jazz band visited 92 cities more than the rock band. How many cities did each group visit?
March 5, 2013

Algebra
Suppose that x liters of 40% acid solution are mixed with y liters of a 43% solution to obtain 100 L of a 41% solution. One equation in a system for solving this problem is x + y = 100. What is the other equation?
March 5, 2013

Algebra
Chuck and Dana agree to meet in Chicago for the weekend. Chuck travels 236 miles in the same time that Dana travels 224 miles. If Chuck’s rate of travel is 3 mph more than Dana’s, and they travel the same length of time, at what speed does Chuck travel?
March 5, 2013

Algebra
The two largest oil spills together released 286 million gallons of oil into the oceans. The smaller of the two released 58 million gallons less than the larger of the two. How many million gallons did the larger one release?
March 5, 2013

Algebra
In a recent school board election, the two candidates for president received 2590 votes. The loser received 1302 fewer votes than the winner. How many votes did the winner receive?
March 5, 2013

Algebra
Mrs. Boyd has a desk full of quarters and nickels. If she has a total of 31 coins with a total face value of $4.55, how many of the coins are nickels?
March 5, 2013

algebra
Regrind, Inc. regrinds used typewriter platens. The cost per platen is $1.70. The fixed cost to run the grinding machine is $267 per day. If the company sells the reground platens for $4.70, how many must be reground daily to break even?
March 5, 2013

Chemistry
For second Part : B,C,D
February 22, 2013

Statistics
Which of the following is an accurate description of Simpson's paradox? When groups of data are aggregated, an association can get stronger because of a confounding variable. That confounding variable is usually the number of observations in different groups of data. When ...
February 21, 2013

- English
where winters are long and cold
February 11, 2013

Math
Which isn't equivalent: 3/7, 6/14, 8/21 or 12/28
January 27, 2013

science
How can you group paracrine, endocrine, and neurotransmitter into two groups? (3 different ways to condense them)
January 14, 2013

CHEMISTRY
The vacancy fraction of a particular metal is found to double as the temperature of the metal is increased from 700 degrees C to 850 degrees C. Calculate the enthalpy of vacancy formation for this metal. Express your answer in units of eV.
January 11, 2013

chemistry
The silicon wafer is coated with a layer of metallic aluminum which acts as an electrical contact. The x-ray diffraction pattern of aluminum is measured in a diffractometer with Fe Kα radiation. At what angle, θ, do you expect to observe the first reflection of ...
January 11, 2013

USC
which of the following is true of quotation marks?
December 28, 2012

Chemistry
tried I and III, its not correct. It can be all, II, III and IIII or somthing else??
December 14, 2012

Chemistry
Maybe he means VI on A?
December 14, 2012

math
convert 23.8m_____kg
December 5, 2012

Pre-calculas Math
how to find the exact value of: cos(9*pi/12)*cos(5*pi/12)+sin(9*pi/12)*sin(5*pi/12)
November 4, 2012

Problem solving:for 3rd grade
Write a real-world problem that you can solve by adding or subtracting.Then give your problem to a classmate to solve.
October 25, 2012

Subtracting 3 digit numbers
Yup.
October 24, 2012

Subtracting 3 digit numbers
Chicago to omaha 459 miles.Dallas to omaha 644
October 24, 2012

Subtracting 3 digit numbers
Jill is going on a trip from chicago to omaha to tulsa.Bill will travel from dallas to omaha.How much farther will jill travel than bill?
October 24, 2012

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