Saturday
August 29, 2015

Posts by David


Total # Posts: 1,810

statistics
a golf ball is selected at random from a golf bag. If the golf bag contains 4 brown balls, 9 yellow balls, and 12 orange balls, find the probability of the following event. probability the ball is brown or yellow?
August 25, 2015

Math
simplify the expression (4 square root of x)/(6-square root of x) I need help with this. I've worked it out to the point where i got (2 square root of x)/(3-square root of x), but I'm pretty sure that it can be simplified further. If what I'm thinking is right you ...
August 25, 2015

Math
simplify the expression (4 square root of x)/(6-square root of x) I need help with this. I've worked it out to the point where i got (2 square root of x)/(3-square root of x), but I'm pretty sure that it can be simplified further. If what I'm thinking is right you ...
August 25, 2015

sensitive probability plz help
Lol what a joke of a teacher
August 14, 2015

Physic
A bullet of mass 0.05kg has a speed of 400cm|s. What is its kinectic energy? It hits a wall of which the average resistive force is 1000N, Cal.the distance penestrated by the bullet
August 10, 2015

Maths
Five-eights of the population of a village are men, one-sixth are children and the rest, 500 in number are women. How many children are there?
August 7, 2015

billing and coding
which of the following will you place below the returned address of a business envolope
July 16, 2015

Math
A boy throws a ball with a horizontal speed of 2.5 m/s at a height of 0.8 m above the ground. The Coefficient Of Restitution between ball and ground is 80%. • Calculate the x− and y−components of the ball’s velocity, immediately after its first bounce. ...
July 12, 2015

Algebra
the approximate distance, S, in feet that an object falls in t seconds when dropped from a height can be found by using the formula S=16t^2. How long will the object have fallen in 8 seconds?
July 11, 2015

Geometry
The Effel Tower in Paris is 328 feet wide at the bottom and 984 feet tall a model of the tower is 12 inches tall What is the width of the model?Round to the nearest tenth
July 10, 2015

algebra 2
Bonnie and Bruce have a rectangular swimming pool that is 6 feet wide and 10 feet long. They are going to build a tile border of uniform width around the pool. They have a 105 square feet of tile. How wide should the border be?
July 8, 2015

Physics
A 50kg sign for a local business is hung from a bar which meets a wall at right angles as shown in figure 1. The bar is 1.5 meters long, and it's mass may be neglected. The center of mass of th sign is 1.0 meters from the wall (but .50 meters from the tip of the cable) as ...
June 24, 2015

UNIBEN Demonstration secondary school, benin city,Nigeria
how to calculate mole fraction
June 18, 2015

math
In a class of 40 students 18 passed economics 19 passed accounts 16 passed economics 6 passed mathematics only 9 passed accounts only 5 passed mathematics and accounts only 2 passed accounts and economics only. How many failed in all the papers? How many failed in economics? ...
June 15, 2015

Physics
An automobile and a truck start from rest at the same instant, with the automobile initially at some distance behind the truck. The truck has a constant acceleration of 2.15m/s2 , and the automobile an acceleration of 3.47m/s2 . The automobile overtakes the truck after the ...
June 8, 2015

International Accounting
On December 1, Year1, El Primero Company purchases inventory from a foreign supplier for 40,000 coronas. Payment will be made in 90 days after El Primero has sold this merchandise. Sales are made rather quickly and El Primero pays this entire obligation on February 15, Year 2...
May 28, 2015

Language Arts
Thank you so much Ms Sue!
May 23, 2015

Language Arts
Jillian ran around the track as fast as she could Seth waited on the corner for the bus to arrive The house on top of the hill looked abandoned The squirrel sensing danger hid behind a tree
May 23, 2015

Language Arts
Which of the following sentences contains a prepositional phrase that acts as an adjective?
May 23, 2015

math
(10^2t)-2(10^t)+1=0 let 10^t=y please help
May 11, 2015

Math
nvm i guessed 120 and got it right
April 23, 2015

Math
Simplify the expression 6P3. I don't know how to solve it so if you could help me with it as well i would really appreciate it.
April 23, 2015

AP Chemistry
Determine the volumes of 0.10 M CH3COOH and 0.10 M CH3COONa required to prepare 10.0 mL of buffer of each of the following pH values? a. Ph 3.7 b. pH 5.7 C. pH 5.7 I just need to see how to do one of them and I'll understand how to do the rest.
April 22, 2015

PE
1 i got ankle sprain 2 i dont really understand it 3 you got it right its a
April 20, 2015

chemistry
Sulfur dioxide and oxygen gases react at high temperature (400 o C) in the presence of a catalyst(like Pt) to form sulfur trioxide gas. The reaction is started from a gas mixture at 400oC with the partial pressures PSO2 = 15 atm and PO2= 10. atm. What will be the final partial...
April 17, 2015

chemistry
Hydrogen gas (7.0 mL) is mixed with chlorine gas(4.0 mL) at a certain pressure and temperature. A reaction between H2and Cl2 is initiated by UV light. If pressure and temperature are kept constant, which gases and in which volumes will be found after the reaction is completed?
April 17, 2015

Physics
I dont know where to even begin... Two equally charged ping pong balls, each having a mass of 5g repel eachother hanging from different strings attached at the same fixed point above. The angle each makes with the vertical is 30 degrees and they are separated by a distance of ...
April 16, 2015

English
My child is autistic and we try our best.
April 16, 2015

English
I am helping my child and didn't read much of the book Dragonwings, so can you help me to answer what is moon shadows point of view of the opium dens.
April 16, 2015

PHYsics
A centrifuge for separation of sugar crystals in molasses must exert a force of 6 N/g. If the filter drum has a radius of 350 mm, determine the required speed in the revolution per minute I tried the following F = 6 = 10^-3*a a = 6000 = ω^2*r
April 14, 2015

math
A city park employee collected 600 cents in nickels, dimes and quarters at the bottom of a wishing well. There were 10 nickels and a combined total of 25 dimes and quarters. How many dimes and quarters were at the bottom of the well? I know the answer but need help with what ...
April 9, 2015

physics
A copper atom has 29 electrons revolving around the nucleus. A copper ball has 4x10^23 atoms. What fraction of the electrons be removed to give the ball a charge of +9.6uC?
March 31, 2015

Pschology 202
well- being
March 29, 2015

Pschology 202
true
March 29, 2015

Math
You run 21 miles in 6 days. find the rate.
March 12, 2015

Managerial Accounting
Waterways is thinking of mass-producing one of its special-order sprinklers. To do so would increase variable costs for all sprinklers by an average of $0.70 per unit. The company also estimates that this change could increase the overall number of sprinklers sold by 10%, and ...
March 11, 2015

Accounting
Waterways is thinking of mass-producing one of its special-order sprinklers. To do so would increase variable costs for all sprinklers by an average of $0.70 per unit. The company also estimates that this change could increase the overall number of sprinklers sold by 10%, and ...
March 11, 2015

chemistry
10 l of a solution containing 1.5 moles of HI
March 10, 2015

Physics
Consider an air-bubble level that is sitting on a horizontal surface. Initially, the air bubble is in the middle of the horizontal glass tube. (a) If the level is pushed and a force is applied to accelerate it, which way would the bubble move? Which way would the bubble move ...
March 3, 2015

Physics
A 100 kg crate rest at the back of the bed of a pick up truck. The length of the crate is 1 m in the length of the bed is 4 m. There is no friction between the bed of the truck in the crate. If the truck is traveling at 25 m/s just before it hits the wall, how long before the ...
March 3, 2015

scdience
the density of gas was done twice, but with the tablet and 15 cm^3 of water in each case.When the rubber tube was placed as shown , 435 cm^3 of gas was collected. When the tube reached only slightly beyond the mouth of the bottle, only 370 cm^3 of gas was collected. The change...
March 2, 2015

math
first string sports can purchase sneakers for $450 per dozen less trade discounts of 14/12 from ideal shoes. Fancy footwear is offering the same sneakers for $435 less trade discounts of 18/6. Which supplier offers a lower net price? would i be correct if i said first string ...
February 27, 2015

math
Would I be correct if I put $54.58 as my answer, Steve?
February 26, 2015

math
okay i get that so would i be correct if i did 889.00*61.4? since trade discount equals list price * trade discount percentage?
February 26, 2015

math
A watch with a list price of $889.00 is sold by a wholesaler at a net cost of $545.75. Find the single trade discount rate being offered. round to the nearest tenth of a percent To solve this i did 545.75 divided by 889.00 that gave me 0.61389 which comes out to 61.4% if i ...
February 26, 2015

math
so would i be correct if i got $155.56 as an answer, Lucina?
February 26, 2015

math
The list price of a set of fine china is $345.70 and the trade discount is 55%. Find the net cost. I did $345.70 *.55= 190.14 that gives me the trade discount. i'm confused on how i then find the net cost, do i subtract 190.14 from 345.70 to get the net cost?
February 26, 2015

math
The ratio is 2:7>their mom gives each of them the 15 marbles and now David has twice as many marbles as Charlie.How many marbles does each boy have
February 24, 2015

math
The ratio of Juma’s and Akinyi's earnings was 5:3. Juma’s earnings rose to shilling 8400 after an increase of 12%. Calculate the percentage increase in Akinyi’s earning given that the sum of their new earnings was shilling 14100. (b) Juma and Akinyi ...
February 24, 2015

Business Math
Find the ordinary interest to the nearest cent. $19,000 at 12% for 101 days
February 23, 2015

math
In the geometric progression, the first is a and the common ratio is r. The sun of the first two terms is 12 and the third term is 16 Determine the ratio (ar^2)/(a+ar) If the first term is larger than the second term, find the value of r.
February 17, 2015

math
A perpendicular to the line -4x +3 = 0 point (8, 5). Determine its equation x = 4/3 undefined y = 5
February 17, 2015

Math
A fuel dealer makes a profit of shillings 520 for every 1000 liters of petrol sold and shillings 480 for every 1000 liters of diesel sold. In a certain month the dealer sold twice as much diesel as petrol. If the total fuel sold that month was 900,000 liters, find the dealer&#...
February 17, 2015

science
In an experiment to determine the speed of sound, two observers, A and B, were stationed 5.0 km apart. Each was equipped with a gun and a stopwatch. Observer A heard the report of B's gun 15.5 s after seeing it's flash. Later, A fired his gun and B heard the report 14....
February 16, 2015

physics
h=v_0+at^2 h=0+(-9.8)t^2 h=96.4(t) .45h=96.4(1) h=96.1/0.45 h=213.422ft
February 6, 2015

math
its no proof but you could see the results are: 3/2, 6/5, 15/14,42/41,123/122,366/365,1095/1094,3282/3281,9843/9842. as you could see it comes closer and closer to 1 therfore its limit is 1.
February 1, 2015

math
I can answer the second part. Obviously it converges to 1. But i do not know how to prove it... I do not know if it is legit but maybe since you know the limit is 1 use definition: For every n>N |a_n-1|<epsilon and prove this way.
February 1, 2015

ELA FAST HELP URGENT
It's A. Limericks are witty poems that are about 5 lines long. There was a young lady of Niger who smiled as she rode on a tiger; They returned from the ride with the lady inside, and the smile on the face of the tiger.
January 30, 2015

physics
At the instant the traffic light turns green, an automobile that has been waiting at an intersection starts ahead with a constant acceleration of 2.10m/s2 . At the same instant, a truck, traveling with a constant speed of 15.1m/s , overtakes and passes the automobile. How far ...
January 29, 2015

physics
A rod with length L and mass m stand on a frictionless table. a ball with mass m and speed u cimped perpendicular to the rod a distance x from the bottom of the rod and sticks to it. what is the angular velocity of the rod+ball after the collison? I need help on how to solve ...
January 27, 2015

math
if your body releases about a liter of saliva a day how many years to release a kiloliter
January 25, 2015

math
what are all the rectangular pens you can build with 16 yds of fencing
January 25, 2015

Physics
A car slows down from a speed of 24.0m/s to rest in 9.0s, How far did it travel in that time?
January 24, 2015

Physics
car leaves skid mark 72m in length with a deceleration speed of 7.20m/s^2. what was the initial speed prior to braking?
January 24, 2015

Physics
A car leaves skid marks 72m in length. The deceleration is 7.2m/s^2. What is the speed of the car before braking?
January 23, 2015

Chemistry
How much energy (in kilojoules) is released when 15.2g of steam at 114.5∘C is condensed to give liquid water at 63.5∘C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K⋅mol) for the liquid and 33.6 J/(K⋅...
January 21, 2015

accounting
did you ever get your answer
January 13, 2015

english
Write a narrative essay that ends with 'once beaten, twice shy'
January 13, 2015

physics
A heavy table of mass M is vibrationally isolated by being hung from the ceiling by springs, so that its frequency of vertical oscillation is \omega_0 (take \omega_0 to be 2\pi/sec, a typical value). Assume now that the ceiling vibrates vertically with amplitude A at frequency...
January 8, 2015

Math
1) Prove that for every x>=0 and 0<a<1 x^a-ax<=1-a 2)prove that for 0<=x<=1: x^m*(1-x)^n<= (m^m*n^n)/((m+n)^(m+n)) can someone please guide/help me in about how to solve and or approch these questions? (I know I have already posted it before but i think it...
January 7, 2015

Math
1) Proove that for every x>=0 and 0<a<1 x^a-ax<=1-a 2)prove that for 0<=x<=1: x^m*(1-x)^n<= (m^m*n^n)/((m+n)^(m+n)) can someone please guide/help me in about how to solve and or approch these questions?
January 7, 2015

programming
It is a computer course for physicists. Therfore i do not study programming as my main course. also i have missed a few lessons, therfore i do not even know where to begin.
December 26, 2014

programming
– Define a structure called Object which includes three doubles specifying the object’s mass, volume and density. – Create an array of 10 Objects. – Define the function void scanobjectsdata(struct Object objects[], int size) that scans from the input and ...
December 26, 2014

AP Calc
Find the value of c which satisfies Rolle’s Theorem for the function f(x)=sin(x²) on (0,√π).
December 20, 2014

Physics
A 283 g air track glider moving at 0.69 m/s on a 2.4 m long air track collides elastically with a 467 g glider at rest in the middle of the horizontal track. The end of the track over which the struck glider moves is not frictionless, and the glider moves with a coefficient of...
December 14, 2014

Physics
A 283 g air track glider moving at 0.69 m/s on a 2.4 m long air track collides elastically with a 467 g glider at rest in the middle of the horizontal track. The end of the track over which the struck glider moves is not frictionless, and the glider moves with a coefficient of...
December 12, 2014

Calculus
Thanks!
December 10, 2014

Calculus
This is a calculus homework question but in reality the problem here is understanding the algebra. Find the Critical Numbers of f(x) = x^(3/5)(4-x) The product rule gives -x^(3/5) + (12-3x)/(5x^(2/5) My booklet explains that simplifying this gives you 12-8x / (5x^(2/5). How ...
December 10, 2014

Calculus
in the equation a/(1-r)
December 8, 2014

Calculus
so a is the first term in the series and r is the term that is being reused over and over again ?
December 8, 2014

Calculus
So this one is confusing me: limit of n as it approaches infinity of (n{SIGMA}i=1) (1/(2^i) *the n is on top of the sigma notation and i=1 is at the bottom. I understand that 'i' would equal (n(n+1))/2 however the algebra from there confuses me.
December 8, 2014

Calculus
I am trying to solve the following L'hopital's limits question below: lim x -> 0 from the positive direction of ( 5^(sin(x)) - 1 )/ (x)
December 8, 2014

Calculus
L'hopital's question below: lim x -> 0 from the positive direction of ( 5^(sin(x)) - 1 )/ (x)
December 7, 2014

AP Chemistry
What percent (by mass) of granulated sugar is fructose, and what percent of it is sucrose? Background: We are doing a colligative properties lab in my class where we are to add 20 grams, 40 grams, 60 grams, and 80 grams of sugar to 100 grams of water, and use the change in the...
December 6, 2014

AP Chemistry
What is the Van't Hoff Factor of MgSO4*7H2O? We're doing a colligative properties lab at my school where we dissolve various amounts of MgSO4 in 100 grams of water. What value/range of values should I expect the Van't Hoff Factor to be?
December 6, 2014

Physics
You have a brass ring of inside diameter 10.00 cm that is at 20.0oC. You want to slip this ring over an aluminum rod that is at 20.0oC and has a diameter of 10.01 cm. a. To what temperature do you have to heat the ring to slip it over the rod? b. Once you have the ring over ...
December 4, 2014

Biology
Which alga is most closely related to plants? A) Chara B) Kelp C) Ulva D) Diatom E) Euglena I think it's chara, because it is green algae, but I'm not sure. Can you explain to me why it is or not?
November 20, 2014

physics
A person is stranded and sitting 45m above the ground on the ledge of the cliff. of a safety rope is launched upward at an angle of 50 degrees above the horizontal at a distance of 60m away, what is the initial velocity of the rope so that it reaches the stranded person?
November 19, 2014

physica
help A thermally insulated vessel containing 100 grams of ice at 0 degrees Celsius . Water at 55 degrees celsius is poured and after some time , the system reaches the equilibrium at a temperature of 10 degrees Celsius. That amount of water in grams was placed . ( heat fusion...
November 17, 2014

Math
In a coordinate plane, Brittany labeled the coordinates for point m as (-31/2,2). Sade tells Brittany to reflect point m over the x axis to point r. What are the coordinate of point r?
November 16, 2014

physical
help the positions of two particles A and B are P1 (3,4) in meters and P2 ( -3, -4 ) meters respectively. Meters the position A with respect to B is:
November 14, 2014

physics
A space station shaped like a giant wheel has a radius of 1.00 x 10^2 m and a moment of inertia of 5.00 x 10^8 kgm^2. A crew of 150 lives on the rim, and the station is rotating so that the crew experiences an apparent acceleration of 1.0g. When 120 people move to the center ...
November 11, 2014

physics
a 2100 kg car starts from rest and accelerates at a rate of 2.6 m/s for 4 sec. assume that the force acting to accelerate the car is acting in the same direction as its motion. how much work has the car done? m=2100 kg w=fd v1=0 f=ma t=4 sec d=t+1/2at(squared) a=2.6 m/s2
November 11, 2014

Physics
A moving 4.5 kg block collides with a horizontal spring whose spring constant is 226 N/m (see figure). The block compresses the spring a maximum distance of 8.0 cm from its rest position. The coefficient of kinetic friction between the block and the horizontal surface is 0.47...
November 9, 2014

Engineering science
a roller of diameter 1.5 m has a mass of 450 kg; it is pulled by a handle attached to its centre. Find the minimum force to pull up a step which is 250 mm high if the roller handle makes an angle of 30o with the horizontal
November 9, 2014

math
Rounded to what? Currently it is rounded to the nearest thousandth. If you were to round it to the nearest hundredth it would be 0.08 and to the nearest tenth 0.1.
November 6, 2014

Intermediate Algebra
(-9)1/2 = -4.5 which is a real number. Unless you're talking about square roots?
November 6, 2014

chemistry
The trend for electron affinity on the periodic table is that it increases from the bottom left of the table to the top right. He>I>Te>Bi>Na Should be the order.
November 6, 2014

Science HELP
Due to the conservation of mass, the mass of the reactants is equal to the mass of the products. Mass(A) + Mass(B) = Mass Solid Product 10g + 17g = 27g Mass(beaker) = Mass(Beaker + product) - Mass (product) So Mass(Beaker) = 32g - 27g = 5g So your answer is "A. 5g."
November 6, 2014

Math
I'm not entirely sure what you are asking, but I'll give it a shot. (5x4) + (1x4) is NOT the same as 6x8. Lets look at it in detail: 6x8 = 48 5x4 = 20 and 1 x 4 = 4 20 + 4 = 24 which is not 48. The most you could do is some factoring, but you have to make sure your ...
November 6, 2014

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