Tuesday

July 28, 2015

July 28, 2015

Total # Posts: 1,678

**physics**

Use Couloumb's law: F=q1q2/d^2 We get force is inversely proportional to the square of the distance. Solve the rest yourself.
*August 24, 2013*

**math**

Which situation can be modeled by tossing a coin three times? a. choosing which one of sixteen teams will win a tournament c. selecting a desk from thirty-six in a classroom b. deciding which English teacher of eight will win a trip to London d. picking one of six math teachers
*August 17, 2013*

**Math**

so b?
*August 17, 2013*

**Math**

cause i dont understand what you saying
*August 17, 2013*

**Math**

Just tell the answer
*August 17, 2013*

**Lab math**

You are doing a red blood count with a standard dilution of 1/200. The area counted is 10 red squares in a Neubauer chamber. Under these conditions, what is the factor that would be used to determine the number of cells in the undiluted blood?
*August 7, 2013*

**Chemistry/lab math**

Thank you very much for this further clarification; I understand what it is asking now.
*August 7, 2013*

**Chemistry/lab math**

Okay when you set up the equation likewise for potassium and solve it the same way is the answer supposed to be the same? I'm just confused as to whether the question is asking if each should be prepared differently or it's just one solution you're working with.
*August 7, 2013*

**Statistics**

Some answers are wrong.
*August 4, 2013*

**English**

What are the stories that go with each of the tools that Sanders discusses in his essay "Inheritance of Tools?" I don't really understand what the question wants, so I started by saying the history of the hammer. What can I write about the other tools?!
*July 29, 2013*

**Math**

if x and y are two different integers in S, which of the following must be the square of an integer I. (x-1)(y-1) II. 4(x-1) III. x^2+y^2 a. none b. I only c. II only d. III only e. I and II
*July 25, 2013*

**Math**

each "word" in a special code is a three digit number. if no word in the code can begin with a 1 or 0, what is the greatest number of different words the code can contain? 28 512 800 900 1000
*July 25, 2013*

**Math**

if an integer is added to its square, the units' digit of this sum could be....? 1 2 3 4 5
*July 25, 2013*

**Math**

a drugstore had a promotion in which $0.50 was refunded to customers for each $10.00 spent on merchandise. if a customer spent $20.00 on merchandise during this promotion, the refund was equal to what % of the amount spent? 1 1/4% 2 1/2% 5% 25% 50%
*July 25, 2013*

**Math**

if x is r percent of y and if k is s percent y, then x is what percent of k? 100(r+s)% 100/rs% 100r/s% 100s/r% rs/100%
*July 22, 2013*

**Math**

in a league with 6 teams each team is scheduled to play each other team exactly twice. what is the total number of games that are scheduled in the league?
*July 22, 2013*

**math**

if x,y, and z are different integers and x+y+z=3, what is the least possible value of z? -3 1 2 3 cannot be determined from information given
*July 21, 2013*

**math**

if c+4=2a+7b, what is the value of c+6 in terms of a and b? 4a+7b 2a+7b-2 2a+5b+2 2a+9b 2a+7b+2
*July 21, 2013*

**math**

thank you
*July 21, 2013*

**math**

when a large cake is cut into pieces that each weigh 3 ounces, it yields 110 pieces. how many pieces would the cake yield if it were cut into 2 ounce piece instead?
*July 21, 2013*

**math**

a total of $24.00 is to be divided among three children in amounts proportional to their ages. if the children's age are 9, 12, and 15 years, how much money will the YOUNGEST recieve? 2 3 4 5 6
*July 21, 2013*

**Math**

Jason has to sell a box of candy bars for a fundraiser. Yesterday he sold 1/3 of the total number of candy bars that came in the box, and today he sold 3 candy bars. If his sales for these two days was 11/30 of the total number of candy bars that came in the box, how many ...
*July 21, 2013*

**Stats**

A pizza parlor has 13 different toppings available for its pizzas, and 2 of these toppings are pepperoni and anchovies. If a customer picks 2 toppings at random, find the probability that pepperoni is one of the toppings. Round to four decimal places.
*July 17, 2013*

**AP Calc**

Solve the following absolute value inequalities: |x+1|<=|x-3| I promise I'm not posting my whole homework assignment. These are questions that I skipped and have no clue how to do out of a huge packet.
*July 12, 2013*

**AP Calc.**

ohmygosh.. i'm an idiot.. thank you! you're the bestt!(:
*July 12, 2013*

**AP Calc.**

How did you go from the original question to the 1st step?
*July 12, 2013*

**AP Calc.**

but don't you have to get rid of the negative exponents somehow..?
*July 12, 2013*

**AP Calc.**

I don't get it...
*July 12, 2013*

**AP Calc.**

Simplify: [(x^-3)-x]/[(x^-2)-1]
*July 12, 2013*

**AP Calculus**

Got it. Thanks lol
*July 12, 2013*

**AP Calculus**

Wait.. does it matter if it's f(x) or f(y)?
*July 12, 2013*

**AP Calculus**

okay thank youu so much. This is a summer review packet before calculus and I don't remember how to do any of this!
*July 12, 2013*

**AP Calculus**

If f(-x) = f(x), the function is even. If f(-x) = -f(x), the function is odd. If neither is true, the answer is neither.
*July 12, 2013*

**AP Calculus**

Show work to determine if the relation is even, odd, or neither. 1. 3x=|y| (|y|=abs. value of y) Simplify the following complex fractions. 2. [(3/x)-(4/y)]/[(4/x)-(3/y)] PLEASE HELP!
*July 12, 2013*

**AP Calculus**

Oops.. thankyou haha
*July 12, 2013*

**AP Calculus**

I'm suppose to simplify it, but I keep getting 3y-4x/4y-3x. Can you please show me how to do it?!
*July 12, 2013*

**AP Calculus**

[(3/x)-(4/y)]/[(4/x)-(3/y)]
*July 12, 2013*

**Science**

Female silkworm moths (Bombyx mori) attract males by emitting chemical signals that spread through the air. A male hundreds of meters away can detect these molecules and fly toward their source. The sensory organs responsible for this behavior are the comblike antennae visible...
*July 3, 2013*

**Science**

If you were a pharmaceutical researcher, why would you want to learn the three dimensional shapes of naturally occurring signaling molecules?
*July 3, 2013*

**math**

If you are trying to find the area of the triangle you could use trig to find the height of the triangle and then use the formula 1/2 base x height. So draw the Isoceles triangle with each leg 3cm and the base 4cm Draw a centre line forming two right angled triangles find the ...
*June 26, 2013*

**Science**

x-t graph is a displacement vs time graph..right? so you would have a vertical axis as you displacement (distance) and a horizontal axis as the time (in seconds). uniform acceleration means an object moves with a change in velocity that is equal in amount. velocity is a change...
*June 17, 2013*

**Change of subject formular**

in y = x-8, the subject is y. to change that is to make x the subject i.e. the equation must become x = .... here are the few rules to consider; 1. change the sign of the variable when you move it to the other side of the equation. 2. the subject must always be isolated on the...
*June 17, 2013*

**Chemistry**

that strange!! the amount of heat evolved for a particular substance is Q = mc?T where m is the mass of that substance c is the specific heat capacity and ?T is the change in temperature during transition change or reaction. So as the mass increased so the Q as well.
*June 17, 2013*

**Physics**

I think its possible. How can the toy cars are controlled with a controller? isn't that an example of electricity been carried through air? If not then am wrong.
*June 17, 2013*

**Grammar**

I'm sending an email to my teacher. and I wanna know how to send it like the correct way. Hi Miss rodriguez I wanted to know what's my score for reading they still haven't posted it on the portal
*June 11, 2013*

**Physics**

The velocity of a vehicle is uniformly reduced from 72km/h to 24km/ over a distance of 250m down a decline of 1:25 the mass of the vehicle is 1.5Mg and its tractive resistance is 400N. The retardation is uniform. Calculate the total constant braking force required so I found ...
*June 3, 2013*

**geometery**

one could say 8/3 = 12/height h(8/3) = 12 h = (12x3)/8 h = 4.5 or use trigonometry and say sinX= 3/8 X = (1/sin)3/8 X = 22.02 which is the angle of the incline so sin(22.02) = h/12 12sin(22.02) = 4.5
*June 3, 2013*

**Chemistry**

a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of CO2 in the polymer at...
*June 2, 2013*

**Chemistry**

For each pair of structures shown below, indicate whether the two species are identical molecules, enantiomers, or isomers of some other sort.
*June 2, 2013*

**Chemistry**

a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of CO2 in the polymer at...
*June 2, 2013*

**Chemistry**

At very low temperatures the carrier concentration in one of these materials appears to diminish very rapidly. Why is this? Please choose the option that BEST describes this phenomenon.
*June 1, 2013*

**Maths**

Hi I think this is how it should be done, not completely sure please check other scources as well For this question to be answered at least a basic shape is required, is it a rectangle, is it a circle. The optimisation of the perimeter of a rectangle or square could be found ...
*June 1, 2013*

**math**

the rule of fractions is when you add or subtract you need to make the denominators the same 2/3 +3/5 becomes (2x5)/(3x5)+ (3x3)/(5x3) =10/15+9/15 now add the numerators 19/15 5/6 - 3/4 =10/12-9/12 =1/12 with multiplication just multiply both top and bottom 3/5 x 2/5 = 6/25 ...
*June 1, 2013*

**chemistry**

Scratch what i just said out. also, out of the choices provided, which one is closest to 'trigonal pyramidal', because it definitely isn't trigonal planar.
*June 1, 2013*

**chemistry**

It's Tetrahedral, the others i don't know.
*June 1, 2013*

**Chemistry**

Nope. just checked. though there might be a third correct answer...
*May 31, 2013*

**chemistry**

it's wrong. why is it wrong?
*May 31, 2013*

**chemistry**

THEN HOW DO YOU DO A)?
*May 31, 2013*

**Math**

Create a 3rd degree polynomial with real coefficients that has roots -1 and 4i. Write your answer in form ax^3 + bx^2 + cx+ d .
*May 24, 2013*

**Math**

Create a 3rd degree polynomial with real coefficients that has roots -1 and 4i. Write your answer in form ax^3 + bx^2 + cx+ .
*May 24, 2013*

**Science**

Explain if quadruplets-four babies born at one birth are always identical or always fraternal, or if they can be either.
*May 23, 2013*

**Engineering**

Please post the answers for 1_4 and 1_5
*May 23, 2013*

**Civil War **

What book caused many people in the north to look at slavery as a moral issue?
*May 21, 2013*

**Civil War **

The Fugitive Slave Law was criticized because it
*May 21, 2013*

**algebra**

1) how many billions of years will it take 1000 grams of uranium-238 to decay to just 125 grams? 2) a researcher had 37.5 g left from a 600 g sample of sulfer-35. how many half-lives passed during that time? 3) look at problem 2. how many days passed during that time?
*May 9, 2013*

**algebra**

a number cube is rolled 2 times in a row. what is the probability of rolling a number greater than 2 both times?
*May 7, 2013*

**Pre calc**

Projectiles are always parabolas
*May 6, 2013*

**physics**

A meter stick is suspended vertically at a pivot point 27 cm from the top end. It is rotated on the pivot until it is horizontal and then released from rest. What will be its maximum angular velocity (in radians/second)?
*May 6, 2013*

**physics**

While waiting to board a helicopter, you notice that the rotor's motion changed from 340 rev/min to 265 rev/min in one minute. Assuming that this acceleration remains constant, calculate how much longer (in seconds) it will take for the rotor to stop.
*May 6, 2013*

**Algebra 1**

(-2+x) (1+2x)
*May 6, 2013*

**Function**

Write a function rule for the area of a parallelogram whose base is 4 inches more than its height. What is the area of the parallelogram when its height is 8 inches?
*May 6, 2013*

**Function**

Fahrenheit and Celsius are two measures of temperature. The temperature in degrees Celsius is equal to five ninths of 32 less than the temperature in degrees Fahrenheit. What is a function rule that represents this situation?
*May 6, 2013*

**Functions?**

find the range of f(x) = -2x+6 for the domain {-1,3,7,9}
*May 6, 2013*

**Chemistry**

n is the moles of No
*May 6, 2013*

**Chemistry**

use your ideal gas formula, but first find the limiting reagent to find the moles of NO. Then to find volume V=(nRT)/P assume pressure to be one and temperature to be 273K R is the constant .08206. Hoped it helped. The total volume is 12.50+20 (this is true because of the law ...
*May 6, 2013*

**Physics Plz help me**

5.98x10^6
*May 6, 2013*

**Math**

Larry is 74 inches tall and his shadow is 70 inches long. At what degree is the elevation is the sun?
*May 4, 2013*

**algebra**

Beginning with cars made in 1981, all vehicles must contain a 17-digit Vehicle Identification Number (VIN). The first 3 positions must be letters or numbers, position 4 and 5 must be letters, positions 6 and 7 must be numbers, position 8 can be a letter or a number, position 9...
*May 2, 2013*

**chemistry: please check answers.**

This are all right
*April 30, 2013*

**social studies**

again with the articles haha "An article on Abraham Lincoln's rise to the presidency (this should NOT be about his presidency but what he had to do to become president and his struggles to become one)"
*April 29, 2013*

**social studies**

I'm doing a project and I need a atricle on John Brown. (Like Who was he? What did he do? What happened to him? Do I agree? and why? but I'm looking for a article and don't find one
*April 29, 2013*

**Algebra**

Find an equation for the line with y-intercept 3 that is perpendicular to the line 3y=2x-4. A. 2y=6-3x B. 2y=3x+6 C. 3y=9-2x D. 3y=2x+9
*April 29, 2013*

**Algebra**

(4x^2-2x+8) - (x^2+3x-2)=
*April 29, 2013*

**Chemistry**

Thanks.
*April 27, 2013*

**Chemistry**

Which of the following will increase the strength of a sample of 90% SiO2 - 10% MgO Quench the entire sample in water Quench half of the sample in water Cool the entire sample with air jets Cool half the sample with air Submerge the sample in a salt bath of Na2O Submerge the ...
*April 27, 2013*

**chemistry**

Correction, it's right. WHY it is right though, that is the question. After all, who would want to know how to do a similar question where internet access is disallowed? Anyone who hasn't just stumbled onto the question, or already knows how, that's who.
*April 26, 2013*

**chemistry**

it's wrong....
*April 26, 2013*

**Physics**

X10 are done now
*April 26, 2013*

**Physics**

you need to make sure you use the right value for I
*April 26, 2013*

**Physics**

yes i did and i also said you need to use mu/4pi
*April 26, 2013*

**Physics**

(I*10^(-7))/(2*(z-R))
*April 26, 2013*

**Physics**

mu = 4pi * 10^(-7)
*April 26, 2013*

**Physics**

yes but you need mu/4pi
*April 26, 2013*

**Physics**

correct
*April 26, 2013*

**Physics**

you are missing the current I in b
*April 26, 2013*

**Physics**

yes it is good
*April 26, 2013*

**Physics**

You should be using mu/4pi for answer in b
*April 26, 2013*

**chemistry**

Quench the entire sample in water Quench half of the sample in water Cool the entire sample with air jets Cool half the sample with air Submerge the sample in a salt bath of Na2O Submerge the sample in a salt bath of CaO
*April 26, 2013*

**Chemistry**

Calculate the density of atoms on plane (001) in Lithium
*April 26, 2013*

**chemistry**

Am i the only one to make the obvious question here? If we knew how we got the answer, we could spot a mistake that might have been overlooked this entire time. How did we get the answer?
*April 26, 2013*