Wednesday
May 27, 2015

Posts by John


Total # Posts: 6,687

chemistry
17. Calculate H for the following reaction using Hess law H2 (g) + Br2 (g) → 2 HBr (g) Experimental information 2 H+ → H2 H -436.4 kJ 2 Br- → Br2 H -192.5 kJ 2 H+ + 2 Br- →2 HBr H -144.8 kJ
April 2, 2015

self
I have 10 letters. My 1st and 2nd letter means not. My 1st to 5th letter means below. My 6th to 10th letter is to stand. In all, I am when you know. What am I?
April 2, 2015

Math
prime numbers could be 2, 3, 5, 7, 11, etc. What happens with 2, 3 which gives us 6? or with 5, 7 which gives us 35? Can you finish it from here?
March 30, 2015

Math
Change 3 3/4 to an improper fraction by multiplying 4 times 3 and adding it to the numerator 15/4 multiply by 6/1 multiply 6 times 15 and 1 times 4 Divide 90 by 4 to get your answer.
March 30, 2015

Math
If there are 6 numbers on the die, then you have 1/6 of getting the number 5. To get a blue it looks like you have 1/4. For both to happen together (indicated by using "and") then, multiply the two fractions to get your probability. You are correct with answer B.
March 30, 2015

phusics
a 50g bullet is shot from a rifle at 900m/s a) what is the KE of the bullet? b) how much work is done on the bullet if it starts from rest?
March 30, 2015

geometry
the tree is opposite the angle and the 50 feet is adjacent to the tree. opposite/adjacent = tangent x/50 = tan 48. Find tan 48 and multiple by 50 to find "x" which is the height of the tree.
March 30, 2015

math
75 pupils sat for a Science Test. The average score was 58 marks. If the average score of the girls was 62 marks and the average score of the boys was 56 marks, how many boys sat for the test?
March 27, 2015

Civics
Does the prefix "bi" give you a hint?
March 27, 2015

Math Help!!!
It looks like we are taking 1/2 of the previous number or dividing by two. Any time you are multiplying or dividing you have a geometric sequence. If you are adding or subtracting a constant, then you have an arithmetic sequence.
March 27, 2015

Ethics in Technology
I think it might be C. I don't think their salaries went up.
March 27, 2015

math
You will have a right triangle with the 80 meters on the hypotenuse and the x on the side opposite the 75 degree angle. Using Trig: x/80 which is opposite over hypotenuse equal to sin of 75 degrees. Find the sin of 75 and multiply it by 80 to find x.
March 27, 2015

Algebra 2
If you take the square root of 36x^2 you will get 6x. This is fine because you only have one term. But, if you take the square root of 36 - x^2, you can't take the square root of each part when you are adding or subtracting which causes you to have more than one term. The ...
March 27, 2015

Math
Jane will receive 18% less of her regular pay when she retires. Her regular pay is $500 per week. a How much would she receive per week if she retires today? answer: 500/18% = 90 500-90= $410 b. Explain how you can make this same calculation using 100%-18%=82% answer: same as ...
March 26, 2015

chemistry
which of the following molecules will exhibit hydrogen bonding? a. CH3OCH3 b. HF c. CH4 d. LiH
March 25, 2015

French
Please unscramble O É N C A R C S in French. It is a verb.
March 25, 2015

Physics
Water flows horizontally in a tapered pipe at a rate of 500 m^3/h. The area at one section of the pipe is 6500 mm² and 4000 mm² at another section. Calculate the gauge pressure at the larger section if the pressure at the smaller section is atmospheric.
March 23, 2015

History
. In __________ trials, the judge is both the trier of law and the trier of fact. A) de novo B) bench C) jury D) pro se I have a feeling it could be bench
March 22, 2015

math
Mary invested $3,750 for 42 months at a simple interest rate of 3.85%. How much interest did she earn?
March 18, 2015

math
Evaluate using L'Hopital Rule? lim as x approaches x from left (1-x)^(3/x)
March 18, 2015

calculus
The graph of the function y=x^5-x^2+sinx has a point of inflection at x= a. 0.324 b. 0.499 c. 0.506 d. 0.611 e. 0.704 Thanks.
March 15, 2015

English Literature
I read William G Mcloughlin's essay "Pietism and the American Character" and I didn t understand anything I need a brief summary of the main ideas
March 15, 2015

calculus
What is the limit, as x approaches 1, of (sqrt(x) - 1)/(x - 1)? I need to show work, but I know the answer is 3/2, because I confirmed with a TI-89.
March 15, 2015

physics
A 450 kg car traveling north at 30 m/s collides with a 560 kg car traveling west at 35 m/s. If after the collision they become entangled and move off together, (a) what is magnitude of the final momentum of the cars? (b) What is their final speed of the cars? (c) What is their...
March 15, 2015

chemistry
100 / 960 = 150 / x 960 x 150 = 100x ??? = 1440 mm of Hg
March 12, 2015

Finance
Antiques ‘R’ Us is a mature manufacturing firm. The company just paid a dividend of $11.45, but management expects to reduce the payout by 4.5 percent per year, indefinitely. Required: If you require a return of 11 percent return on this stock, what will you pay for...
March 11, 2015

chemistry
when 5g of impure sample of CH4 is completely combusted, 9g of H2O was produced.what is the percentage purity of the sample of CH4
March 11, 2015

math
For which pair of functions f(x) and g(x) below will the lim f(x)/g(x)equal 0 x-infinity f(x) e^x; g(x) = x^3 f(x) x^5; g(x) = e^x f(x) x^3; g(x) = ln(x) f(x) x^negative 2; g(x) = e^negative x
March 9, 2015

math
The area A equals = πr^2 of a circular oil spill changes with the radius. At what rate does the area change with respect to the radius when r equals= 3ft? This is 9pie right? not 6pie?
March 9, 2015

Math
Let x = time (days) for all 3 then x(1/4 + 1/10 + 1/5) = 1 multiplying both sides by 20 x(5 + 2 + 4) = 20 x(11) = 20 x = 20/11 x = 1.82 days or x = 1 day, 19 hours and 38 minutes
March 8, 2015

math
John bought a new car for shilling 800,000. After 5 years, he sold it through a second-hand car dealer. The dealer charged a commission of 4% for the sale of the car. If John received shillings 480,000, calculate the annual rate of depreciation of the car.
March 7, 2015

math
A retailer planned to buy some computers form a wholesaler for a total of shilling 1,800,000. Before the retailer could buy the computers the price per unit was reduced by shilling 4,000. This reduction in price enabled the retailer to buy five more computers using the same ...
March 7, 2015

Math
The length and breadth of a rectangular paper were measured to be the nearest centimeter and found to be 18 cm and 12 cm respectively. Find the percentage error in its perimeter.
March 6, 2015

algebra
1. How many numbers are divisible by 6? 6, 12, 18 and 24 Right? There are 4 chances of getting a number divisible by 6 and 20 chances of getting a number NOT divisible by 6. So, you will have 20/24 which reduces to ??? 2. You can use the counting principle here. For president ...
March 6, 2015

math
A and B farm A produces milk with 3 ½ percent fat and farm B produces milk with 4 ¾ percent fat. (a) Determine (i) The total mass fat in 50 kg milk from farm A and 30 kg of milk from farm B (ii) The percentage of fat in a mixture of 50 kg of milk from A and 30 kg...
March 6, 2015

Probability
PLS
March 6, 2015

Probability
A binary communication system is used to send one of two messages: (i) message A is sent with probability 2/3, and consists of an infinite sequence of zeroes, (ii) message B is sent with probability 1/3, and consists of an infinite sequence of ones. The ith received bit is &#...
March 6, 2015

math
$30/6= $5 each pen $24/8= $3 each file If the student wants to buy 1 pen and 1 file $5 + $3 =$8 least amount that the student must pay
March 6, 2015

algebra
what is y=x^2-2x-8 in vertex form?
March 5, 2015

ela
I agree with you. I bet Ms. Sue will agree too.
March 5, 2015

Math
I have: Lowest number 13 Highest is 27 1st or lower quartile is 16.5 the median is 21 the 3rd or upper quartile I found between 22 and 24 which would be 23.
March 5, 2015

math
Many times we change our mixed number into an improper fraction before multiplying. 5 and 1/16 = 81/16 Multiply 81/16 times 5/1 =405/16 = change this back to a mixed number by dividing by 16 = 25 5/16
March 4, 2015

math
Yes, it goes on forever and ever with no break. Cosine is continuous, but Tangent isn't
March 4, 2015

Math
First, I would get rid of the decimals. It will make life easier. So, multiply both sides of each equation by 10. (That is perfectly legal as long as you do it to both sides of an equation). 2x - 5y = -278 3x + 4y = 687 Our goal is to eliminate either the x or the y. Since the...
March 4, 2015

Math - Geometry - Triangle Medians and Altitudes
Points D, E, and F are the midpoints of sides BC, CA, and AB, respectively, of triangle ABC. Points X, Y, and Z are the midpoints of EF, FD, and DE, respectively. If the area of triangle XYZ is 21, then what is the area of triangle CXY?
March 3, 2015

math
Points $D$, $E$, and $F$ are the midpoints of sides $\overline{BC}$, $\overline{CA}$, and $\overline{AB}$, respectively, of $\triangle ABC$. Points $X$, $Y$, and $Z$ are the midpoints of $\overline{EF}$, $\overline{FD}$, and $\overline{DE}$, respectively. If the area of $\...
March 3, 2015

Math
15/27 ratio should be the same as win/162 15/27 reduces to 5/9 which will make the math a little easier. Can you finish it from here? 5/9 = win/162
March 1, 2015

algebra
length = 2(width) - 2 l = 2w - 2 area = lw area = (2w-2)(w) 264 = 2w^2-2w 0 = 2w^2 -2w-264 0= 2(w^2 - w -132) divide both sides by 2 0 = w^2 - w - 132 Factor and solve for w. you only want the positive value since it is a width. Once you have the width, use l=2w-2 to find the ...
March 1, 2015

Science
Describe the total momentum of billiard balls before and after the cue ball collides with another ball
February 28, 2015

Math
In order to properly design a heating system for a greenhouse, the volume of air in the building needs to be determined. Find the volume of air in the greenhouse below. (3 pts)
February 27, 2015

math
Hi, How do I improve my math skills? I can't calculate in my head (I.e 2x43), I would actually have to write it down to solve it. I took pre-calc, calc and didnt have problem understanding. I don't know what is wrong. what should I do?
February 27, 2015

physics
A small ball of mass 65 g is suspended from a string of length 53 cm and whirled in a circle lying in the horizontal plane.If the string makes an angle of 28◦ with the vertical, find the centripetal force experienced by the ball. The acceleration of gravity is 9.8 m/s 2...
February 26, 2015

physics
A Navy jet (see the figure) with a weight of 219 kN requires an airspeed of 87 m/s for liftoff. The engine develops a maximum force of 100 kN, but that is insufficient for reaching takeoff speed in the 85 m runway available on an aircraft carrier. What minimum force (assumed ...
February 25, 2015

Chemistry
calculate the wavelength of a 0.245 kg baseball thrown at a speed of 40.m/s
February 25, 2015

L.A.
Bella Do u have the answers??
February 25, 2015

Physics
The crane shown in the drawing is lifting a 170-kg crate upward with an acceleration of 1.1 m/s2. The cable from the crate passes over a solid cylindrical pulley at the top of the boom. The pulley has a mass of 130 kg. The cable is then wound onto a hollow cylindrical drum ...
February 24, 2015

Physics
A charge of +444 μC is fixed at the center of a square that is 0.47 m on a side. How much work is done by the electric force as a charge of +5.8 μC is moved from one corner of the square to any other empty corner?
February 24, 2015

Physics
A 2160 kg car traveling at 10.5 m/s collides with a 2740 kg car that is initially at rest at the stoplight. The cars stick together and move 4.00 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that ...
February 24, 2015

Trigonometry
a person standing 400 feet from the base of a mountain measures the angle of elevation from the ground to the top of the mountain to be 25 degrees, the person then walk 500 feet straight back and measures the angle of elevation to now be 20 degrees, how tall is the mountain?
February 23, 2015

Physics
Your car is in a ditch. It requires 4500 N of force to get out of the ditch but you can only push with 750 N. What is the angle the rope needs to make, relative to straight across the road for you to be able to get the car out of the ditch? What is actually pulling the car out?
February 22, 2015

Probability
The conditional probability that exactly k rolls resulted in a 3, given that at least one roll resulted in a 3, is of the form: 11−(c1/c2)c3(c3k)(1c2)k(c1c2)c3−k,for k=1,2,…,6. Find the values of the constants c1, c2, and c3
February 22, 2015

General Chemistry HELP!
Research and describe one current application of the knowledge of the atom. This application can be in any field of your choice. This means the field can be scientific, such as medicine, or nonscientific, such as entertainment. The purpose of this assignment is to learn the ...
February 21, 2015

math
THANK YOU VERY MUCH Ms. Sue. I REALLY appreciate it :)
February 19, 2015

math
I'm. Sorry, it says explain what each ratio meaans. The ratio of bananas to apples is 4:1.
February 19, 2015

math
1.. Write the decimal three and four thousandths. 2.. the ratio of apples to bananas is 4:1.
February 19, 2015

Chemistry
In an acid-base neutralization reaction 25 mL of 0.4 M NaOH reacts with 50.00 mL of H2SO4 solution. Calculate the concentration of the H2SO4 solution?
February 19, 2015

math
The coordinates of point P are (-3, 5). Point R is a reflection of point P across the x-axis. Point S is a reflection of point P across the y-axis. Point R is located in quadrant . Point S is located in quadrant .
February 18, 2015

math
At a certain location in the Coachella Valley of California the elevation is 215 feet below sea level. Clara wrote this elevation as -215 feet. Is Clara's response reasonable? Explain the given elevation with respect to its relationship to 0.
February 18, 2015

math
3/8jof the cast in a musical hE TO SING. WHAT FRACTION OF THE CASt DOES not have to sing?
February 17, 2015

maths
how many terms are there in an arithmetric sequence if it has a common difference of 3 , a last term of 30 and the sum of its terms is 135
February 17, 2015

statistics
From Lab 3, Problem 2 2. The data set magnet is from an experiment to see the effect of voltage and number of turns on the magnetic force of an electromagnet. The experimenters expected to see a limit to which the number of turns could increase the force. (This is actually a ...
February 16, 2015

physics
As a protest against the umpire’s calls, a baseball pitcher throws a ball straight up into the air at a speed of 20.4 m/s. In the process, he moves his hand through a distance of 1.57 m. The acceleration of gravity is 9.8 m/s 2 . If the ball has a mass of 0.147 kg, find ...
February 15, 2015

Chemistry
Calculate the molar extinction coefficients for carotene and chlorophyll using the peaks of highest absorption and Beer’s law.Show your calculations.basically solve for e A = ebc Carotene (Yellow) = Highest peak 450 nm and 0.455 absorption A = ebc 0.455 = e*1cm*c? 0.455...
February 15, 2015

English
Parenthetical expressions include information that may be helpful but are not essential to the meaning of a sentence. They are de-emphasized by ________. A. dashes B. parentheses C. commas D. brackets I'm not really understanding this question. It has to be either B or D ...
February 13, 2015

English
Avoid ________ when writing an essay. A. summarizing B. using personal input C. quotations D. sermonizing D?
February 13, 2015

English
I apologize. I believe it is A
February 13, 2015

English
1. An example of a prediction conclusion is ________. A .suggesting what the audience might do after they read your paper B. picking up an idea or image suggested in the introduction and echoing it in the conclusion C. a logical extension of the information in the body of ...
February 13, 2015

Microeconomics
The demand for a good is given by QD = 750 – 0.4P. What is consumer surplus at a price of $80?
February 11, 2015

math
If a fowl is treated, probability of dying is 1/10 while if not treated the probability is 7/10 calculate the probability that, a fowl picked at random from the 36 fowl is (i) Treated with the drug and will die (ii) Not treated with the drug and will die (iii) Not treated with...
February 11, 2015

Geometry
given ab is a tangent of point x, ab=70 and xd= 12 what is the measure of db?
February 11, 2015

physics
If a rubber tire having a weight of 18.0lbs requires a force of 38.0N to keep it in uniform motion on a level highway find the coefficient of kinetic friction.
February 10, 2015

math
The angle which the tangent to the curve at the point (2, 5) makes with the horizontal
February 10, 2015

math
Integrated Math 1. The Overland Trail: Traveling at a constant Rate. Who will make it? Need help graphing 3 sets of data on one graph?
February 9, 2015

economic theory
assume that a business firm produces two commod ities, X and Y, with two different inpu ts, Labour (L) and Capital (K). The total quantities of L and K available per un it of time are specified as L = 1600 labour hours; and K = 20 00 units. In addition, assume that producing 1...
February 9, 2015

math
The radius of circle is given as 2.8 cm to 2 significant figure (a) If C is the circumference of the circle, determine the limits between which C/π lies. (b) By taking π be 3.14; find to 4 significant figures the line between which the circumference lies
February 9, 2015

math
trying to help the kid with hw but not smart enough. please help. Thank You! -(5/7) ^ -2/5 can be written as -(a)^b where "a" is a positive rational number that is greater than 1 and "b" is a positive rational number that is less than 1. Find 'a' ...
February 8, 2015

math
Samuel bought three cups and four spoons for Kshs 324. Daniel bought five cups and Mary bought two sppons of the same type as those bought by Samuel. Daniel paid Kshs 228 more than Mary. Find the price of each cup and spoon.
February 8, 2015

math
There are two sign posts A and B on the edge of the road. A is 400 m to the west of b. A tree is on a bearing of 60 degree from A and a bearing of 330 degree from B Calculate the shortest distance of the tree from the edge of the road.
February 7, 2015

math
There are two sign posts A and B on the edge of the road. A is 400 m to the west of b. A tree is on a bearing of 60 degree from A and a bearing of 330 degree from B Calculate the shortest distance of the tree from the edge of the road.
February 7, 2015

chemistry
0.000839
February 5, 2015

math
Mary bought and beans from a wholesaler. She then mixed the maize and beans ratio 4:3, she bought the maize as $12 per kg and the beans $4 per kg. if she was to make a profit of 30 %. What should be the selling of price 1 kg of the mixture?
February 5, 2015

math
The cash prize of a television is shillings 25000. A customer paid deposits Shillings 3750. She repaid the amount owing in 24 equal monthly installments. If she was charged simple interest at the rate of 40% p.a, how much was each installment
February 5, 2015

math
16 2/3% or 16.67%
February 5, 2015

math
Mary bought and beans from a wholesaler. She then mixed the maize and beans ratio 4:3 she bought the maize as $12 per kg and the beans $4 per kg. if she was to make a profit of 30 %. What should be the selling of price 1 kg of the mixture?
February 5, 2015

math
Thanks Ms.Sue.. That's what I got when I divided it. So the 50 T-shirts is the better deal.
February 5, 2015

math
one company makes 50 t-shirts for $295 and another offers 40 t-shirts for $250. which company is the better deal? answer please
February 5, 2015

Finance
Determine the annual net cost of these checking accounts: a. Monthly fee $4, check-processing fee of 20 cents, average of 23 checks written per month
February 5, 2015

Finance
Your parents are retired and have expressed concern about the really low interest rates they’re earning on their savings. They’ve been approached by an advisor who says he has a “sure-fire” way to get them higher returns. What would you tell your parents ...
February 5, 2015

math
Spencer Morris works in the telemarketing division for a company that pays a salary of $735 per month plus a commission of 31 2% of all sales greater than $15,500. If he sold $45,900 last month, what was his total gross pay?
February 3, 2015

AP Chemistry
Same. I'm still stuck on this question. Did you get the answer?
January 31, 2015

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