# Posts by David

Total # Posts: 2,277

Math
What is the barbell method

VBS 2010
Write a Web program to calculate the discount rate and interest rate for a bond. If a bond is purchased for n dollars and sold one year later for m dollars, then the discount rate is m-2/m and the interest rate is m-n/n, where each is expressed as a percent.

Chemistry
Thank you !!

Chemistry
what is the hydronium ion concentration in a 0.55 M HNO3 solution ? what is the pH of this solution? Thank You!!!

Chemistry
what is the hydronium ion concentration in a 0.55 M HNO3 solution ? what is the pH of this solution? Thank You!!!

History/English
what does anti colonialist movements outside of america have to do with segregation?

Chemistry- Acid-base titration
The indicated endpoint of an acid-base titration seldom occurs at a ph of 7. what determines the ph of the endpoint??

Algebra/Number Theory
Solution 1: Since a2>b2+22, thus a>b. Since a and b are consecutive positive integers, we have a=b+1. Substituting in the above expression, we have (b+1)2=b2+2b+1>b2+22⇒b>22−12⇒b≥11. Thus a+b=2b+1≥2×11+1=23. Solution 2: Since a2&...

math
Well psydag how do you know that as you were typing that rude comment he wasn't typing his answers in the chat.

chemistry
A 32.0-g sample of water at 290. K is mixed with 51.0 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.

english
so its okay is i say-- The U.S. Involvement in Vietnam From 1945-1964

english
does the word "from" get capitalized in a title?

AP chemistry
A concentration cell consists of the same re- dox couples at the anode and the cathode, with different concentrations of the ions in the respective compartments. Find the un- known concentration for the following cell. Pb(s) | Pb2+(aq, ?) || Pb2+(aq, 0.1 M) | Pb(s) Answer in ...

Chemistry
A concentration cell consists of the same re- dox couples at the anode and the cathode, with different concentrations of the ions in the respective compartments. Find the un- known concentration for the following cell. Pb(s) | Pb2+(aq, ?) || Pb2+(aq, 0.1 M) | Pb(s) Answer in ...

Computer Science
What is the fastest way to compare two strings containing only numbers. eg: "3423492349328492343.939842903482304" "349832498234932.92384924893294343" There can be at max 20 numbers before and after the decimal place. The majority will be around 20, however ...

Math
84-64cos(theta)

Algebra
A shingle falls straight down from the roof of a building that is 144 feet tall. a. Use a vertical motion model to write an equation that gives the height h of the shingle t seconds after it falls. b. When does the shingle hit the ground? c. If the same shingle were dropped ...

Math
describe how you can use the graph of y=x^2 to graph the given function. y=2x^2 + 3 y=-3/4x^2 + 5

Math
THANK YOU !!!

HISTORY
What was the third force in Vietnam?

math
Two non-negative numbers are chosen such that their sum is 30. Find the numbers if the sum of their squares is to be a maximum. Explanation to solve this would help !

Life orientation
Critical ways in wich hiv/aids problem impacts on the community and relevant sources to support

history
Why was monolithic soviet communism an important idea for the reason why US supported Diem's regime in south vietnam from 1954-64? Give 4 reasons. I already have some but i just want some more ideas for brainstorming.

Pre algabra
write 121 to 4 feet as a ratio in lowest terms

Life science, history, geography, and maths literacy
BEST THING EVER

ap calculus
oh! the function is (2-5x)^3 i got the double derivative -15(2-5x)(-5)

ap calculus
-find the coordinates for all points of inflection . find all intervals on which function has upward or downward concavity? -i found to be 2/5

Math
actually is lim x->0 (1+x)^(1/x)=e. not lim x->infinity (1+x)^(1/x)=e.

Math
Given table, X ; (1+x)^(1/x) -0.5. ; 4 -0.1 ; 2.8680 -0.01 ; 2.7320 -0.001; 2.7196 0.001 ; 2.7169 0.01 ; 2.7048 0.1 ; 2.5937 0 5 ; 2.25 From the table, show that lim x->infinity (1+x)^(1/x)=e. Plz someone show me the step how to show it based on the table. Hope u can read ...

Physics
For this problem, you are allowed to consult with other members of the class, but not with faculty and not with anyone outside the course. Simplify all your expressions. A car of mass, 2m, is going around a turn at a constant radius, R, with velocity, v0. The turn is not ...

math 114
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?

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?

b. 8 for \$1.90

I NEEDS ANSWERS I AM CLUELESS

Chemistry
How many milliliters of 0.291 M HCl would be required to titrate 6.83 g KOH?

Spanish
Thank you MathMat, also is this the correct way to say, "hope to be back soon" in Spanish, "esperamos volver pronto"

Spanish
Hi there, how would I say the following phrase in Spanish: Mexico, it was beautiful. Next stop Italy.

english
paint audio

Trig
Whats the height of a flagpole if a student stand 37feet from it and determines the angle of elevation to be 34degrees and her eyes are 5.3 feet from the ground(round to the nearest whole number)

Trig
the number of solutions of sin x= -sqrt3/2 for x between 0 and 2pi

Trig
the height of a flagpole if a student stands 37 feet from it and determines the angle of elevation to be 34 degrees and her eyes are 5.3 feet from the ground.

Introduction to Business Environment Chapter 2
come on i have the answers, just wanted to check if i was correct

Introduction to Business Environment Chapter 2
The world's population is growing more slowly than expected, and there are some industrial countries in which growth might be so slow that there will be too many old people and too few young people to support them. (Points : 1) True False 2. In a free market system, price ...

1. An entrepreneur is an individual who has worked for a nonprofit organization for his entire career. (Points : 1) True False 2. In analyzing factors of production that make a country "rich," it has been observed that some relatively poor countries often have plenty...

maths
Solve for m:E=mgh+1\2mu

algebra
arrange the terms in descending order (can any one give an example) 5-4x2+x3-6x

math
Thanks

math
Add the trinomials x + y - 2 and x - y + 4

math
can you give an example

math
arrange the terms in descending order. 5 - 4x2 + x3 - 6x

L0velyLayna
I'm in 8th all so can you reword it.

Chemistry

Chemistry
!00.0 grams of Na2SO4 reacts with 150.00 grams of Ba(NO3)2to form NaNO3 and BaSO4. How many grams of barium sulfate will form?

math ( polynomial )
How did you get the answer. For I can work it out.

math ( polynomial )
Identify each polynomial below as a monomial, bnomial, or trinomial and name the degree x2 - 25 x2 - 6x + 7 2x + 3y - 4

math
Thank you guys this really helps

math
sorry meant 8ft

math
tony cut 2 ft 7 1/2 in. length from 8 in long board. what is the remaining length of the board.

Geometry

Geometry
(1,3)

Algebra
oops, I made a mistake. There are 435 tiles!!!!

Algebra
The floor of a dance studio is covered with 615 tiles. The owner of the studio replaced the tiles last year. The tiles cost \$15 for a set of 8 and \$2 for each additional tile. What is the monthly increase the owner charged each of her 34 students over a 6-month period to cover...

Algebra
There are 435 tiles, not 615. Sorry.

Vocabulary
I need help with writing sentences using my vocabularywords

Math
0.5

Chemistry
Q1: You wish to prepare a buffer solution with pH = 11.10. What volume of 6.0 M HCl would you add to 500 mL of 0.10 M (C2H5)2NH to prepare the buffer? You may assume that the solution’s volume remains constant. Q2: What is the resulting pH when 20 mL of 0.20 M NaOH is ...

Physics
A simple pendulum in a certain planet is found to vibrate 50 times in 100s. Find its (a) period, (b) its frequency. (c) When 1.5m of its length is cut, it vibrates 50 times in 50 s. Find the original length of the pendulum. thanks in advance

Math
the length of a rectangular garden exceeds its width by 8 feet. if each side of the garden is increased by 2 feet, the area of the garden will be increased by 60 square feet. find the dimensions of the original garden

Chemistry
LiBr<Glucose<Zinc nitrate

Applied maths
Evaluate in the domain of complex variables. a) [3(cos⁡〖55°〗+j sin⁡〖55°〗 )]^2 b) (5.0/15°)^3 c) (52/42°)^(1/2) d) ∜4

Applied maths
When a capacitor , charged to a voltage , is discharged through a resistor , the current will decay exponentially according to the following equation: i=E/R e^(-t/RC) If E=250 V,C=160 μF and R=2100 Ω, answer the following questions: a) What is the maximum current in...

Applied maths
2. When light passes through a transparent medium, its intensity I at a depth d can be modelled using the equation where I0 is the initial intensity, and k is a constant. If the intensity of sunlight is reduced to 54% of its original value after penetrating through a depth of...

Aplied maths
1. A steel plate initially at 21.2°C is placed in a furnace at 785°C for 58.0 minutes. While in the furnace the temperature of the plate increases at a rate of 4.18% per minute. After 58.0 minutes, the plate is removed from the furnace and placed on a concrete slab to ...

Trignometry
A car is moving at a rate of 55 mph and the diameter of its wheels is 2 feet. A) Find the number of revolutions per minute the wheels are rotating. B) Find the angular speed of the wheels in radians per minutes.

Chemistry
If I titrate a sample containing Ammonium Sulphide with a 0.05m Cadmium chloride until an end point is reached, how do I calculate the % sulphide in the sample

Physics
An ideal refrigerator-freezer operates with a COP = 8.0 in a 28°C room. What is the temperature inside the freezer?

Chem ap
What is the concentration of cations of a 2 molar CoCl3 solution?

math
8 students share 5 yds of ribbon equally, what fraction does each student get?

Math
A box with a height of 2 centimeters has a volume of 24 cubic centimeters. The length is three times longer that its width. What is the length of the box?

Math
Ms. Quon discovered that 40 students liked soccer, 20 liked basketball, 10 liked football, and 5 liked swimming. How many times as many students liked basketball as football? Soccer as football?

Chemistry
yes it isa question

Chemistry
a sample of silver chromate has a mass of 78.6 grams?

Physics
The speed of the head of a redheaded woodpecker reaches 3.4 m/s before impact with the tree. The mass of the head is 0.060 kg and the average force on the head during impact is 5.0 N. a)Find the acceleration of the head (assuming constant acceleration) (b) Find the depth of ...

Chemistry
Calculate the molality of HCl in an aqueous 12M HCl solution that has a density of 1.20g/mL

programming logic
The Banking e-Teller system allows bank customers to perform ATM transactions from their cell or smart phones. BET will allow customers to check balances, make remote photo capture check deposits, and perform balance transfers to their checking or savings account. It is time ...

Math
approximate 1802 ft

can u help me
Yeah, I have the same question but I need to get a 100! My math grade is a 89! it will go up! :D

Math
A single card is drawn from a deck. Find the probability of selecting a 10 or a diamond.

chemistry
at 20 C the vapor pressure of dry ice is 56.5 atm. if 32 g of dry ice is placed in an evacuated .25 l chamber at a constant temperature of 20 C will all the dry ice sublime

chemistry
at 20 C the vapor pressure of dry ice is 56.5 atm. if 32 g of dry ice is placed in an evacuated .25 l chamber at a constant temperature of 20 C will all the dry ice sublime

physics
an electron with a mass of 9.11 x 10^-31 kg is accelerated from rest across a set of 150 V and are separated by 0.80 cm. a) determine the kinetic energy of the electron after it crosses between the plates.( ans 2.4 * 10^-17 j) b) determine the final speed of the electrons. (...

math
c 162

science
How would you find a mass of a rolling marble?

Co-op
I know that it is too late to answer but in case for somebody who needs the assistance with that again should go to the professional writers and get the assistance there. To be exact, check Prime Writing service.

Math
4x7=( 2x7 ) + (2x7)=28

R&slotto pool
What are the possible numbers to play for todays club master lotto pool

principal management
Discuss how the path-goal theory of leadership and the expectancy theory of motivation are related

principal management
8. (TCO8) Briefly explain what is meant by objective and judgmental performance evaluation. Discuss two methods of judgmental evaluation. (Points : 10)