Saturday

August 29, 2015
Total # Posts: 952

**Chemistry**

What mass of substance would be needed to prepare these solutions: 1) 400ml (cm3) at 5% weight/volume 2) 50ml (cm3) of NAOH at 10% weight/volume
*October 21, 2009*

**Math**

7 11 10 7+11+10=11+9+8=28 9 8 8 9 10 8+9+10=9+7+11=28 7 11 8 7 11 8+7+11=7+9+10=26 9 10 of the three possible solutions only 7, 9, and 11 will work in the center horizontal row.
*October 21, 2009*

**physics**

if an object has a net force of 60N east and mass of the object is 60kg what is it's acceleration?
*October 20, 2009*

**operating system**

Can someone tell me how I would make a process tree with the following data: F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD 4 S 0 1 0 0 80 0 - 764 select ? 00:00:01 init 5 S 0 2 0 0 75 -5 - 0 kthrea ? 00:00:00 kthreadd 1 S 0 3 2 0 -40 - - 0 migrat ? 00:00:00 migration/0 ...
*October 17, 2009*

**math**

6 1/3
*October 6, 2009*

**math am i correct**

I didnt notice until now, but oyu moved teh terms wrong. original: x+4y=8 -> 4y = -x + 8 Divide each side by 4 to isolate y: y = -(1/4)x + 2 In teh form y = mx + b (y-intercept form), m is the slop. So slope = -1/4.
*October 4, 2009*

**math am i correct**

You have to divide both sides by 4 to isolate y, then the slop will be the coefficient of x.
*October 4, 2009*

**Math**

By the way what ive got so far is: gcd(a,b) = d, so d|a and d|b, so d|(a+b). Since d|(a+b) and d|a d <= gcd(a,b+a), which means gcd(a,b) <= gcd(a,b+a). Its the other half that im stumped for.
*October 4, 2009*

**Math**

This is a problem concerning GCD. I need to prove gcd(a,b) = gcd(a,b+a). I always get like like halfway then hit a roadblock (e.g. i can prove gcd(a,b) <= gcd(a,b+a) but not gcd(a,b) >= gcd(a,b+a).
*October 4, 2009*

**measurements**

Why do we measure perimeter in ft, area in ft^2 (or feet squared), and volume in ft^3 (or feet cubed)? What does each mean within the strand of measurement?
*October 1, 2009*

**English**

I need a sentence with a Helping verb, pronoun,verb,pronoun,preposition,and noun. all in order. Please and thank you
*September 20, 2009*

**Music**

What is the largest violin size?
*September 17, 2009*

**Chemistry**

Is the following statement true? Explain fully. "Any sample made up of only one substance is homogeneous."
*September 9, 2009*

**Chemistry**

When dry and empty, a flask had a mass of 27.31 grams. When filled with distilled water at 25.0 deg C, it weighed 36.84 grams. After cleaning and drying, the flask was filled with chloroform and found to weigh 41.43 grams. At 25.0 deg C, the density of water is 0.9970 g/cm^3. ...
*September 9, 2009*

**Spanish 1**

Please help me answer these questions 10. ¿Te gustan los museos? 11. ¿Te gusta ir de compras? 12. ¿Te gustan los perros? thanks
*August 31, 2009*

**Geometry**

Thank you MathMate!!! I did some research but I just did not find what I was looking for.
*August 11, 2009*

**english**

In the sentence Hiawatha is the hero of an Indian Legend, is hero an adjective describing Hiawatha.
*August 10, 2009*

**Elementary Math**

Thanks to both of you helping me with this questions.
*August 9, 2009*

**Elementary Math**

YES BUT I NEED TO CHOOSE ANY FROM THE MULT. CHOICE NOT ONLY NORMAL DISTRIBUTION MAM.
*August 9, 2009*

**Elementary Math**

So then Ms. Sue what is the answer though? D? I'm confused?
*August 9, 2009*

**Elementary Math**

Decide which of the variables described is likely to have a normal or near-normal distribution. a. The number of courses remaining until graduation for the students in a small liberal arts college b. The SAT mathematics scores for students in an advanced placement mathematics ...
*August 9, 2009*

**MTH 156**

thank you PsyDAG
*August 9, 2009*

**MTH 156**

"Emergency Please Help"!!!!! A bus is scheduled to stop at a certain bus stop every 45 minutes. At the end of the day, buses still stop after every 45 minutes, but because delays often occur earlier in the day, the bus is never early and likely to be late. The ...
*August 9, 2009*

**Basic Math**

i have worked it I got the answer like you I guess I just need to go with what you and I got right?
*August 9, 2009*

**Basic Math**

Reiny this are my mult. choice that I need to choose from I'm studying for my exam for next week. A) 204 : 13 B) 191 : 13 C) 13 : 204 D) 13 : 191
*August 9, 2009*

**maths**

ques1)43% of 50, 14%of30, 23%of71 ques2)18 children in a class have brown eyes- that is 60%of the class with brown eyes. How many children are there in total in the class.
*August 5, 2009*

**Characteristics of Interpersonal Communication**

In this scenario, assume the role of a student. You have read assignment details in your course syllabus, but you are still unsure what to do. Think about how you would approach your instructor versus how you would approach a classmate to receive more information about the ...
*May 5, 2009*

**math**

IT included a monthly center fold
*March 9, 2009*

**Algebra 2**

I need some help with my radical equations. I would really appreciate some aassistance.
*February 15, 2009*

**Algebra 2**

Can someone helpe me solve this equation . Help me break it down please..becuase i have tried to do it mnay times but have fallen short... [SQRT(x + 3)] - [SQRT(x - 2)] =1
*February 12, 2009*

**INEED MATH HELP BADLY PLEASE HELP**

[ãv(2x+2) - ãv(x-3)][ãv(2x+2) - ãv(x-3)] = 4
*January 12, 2009*

**INEED MATH HELP BADLY PLEASE HELP**

CAN SOMEONE PLEASE HELP ME WITH MY SQUARE ROOT AND FOILING PLEASE?
*January 12, 2009*

**ALgebra**

Can someone help me foil this equation? [ã(2x+2) - ã(x-3)][ã(2x+2) - ã(x-3)] = 4
*January 12, 2009*

**Physics**

Sorry for rewording it wrong. After 35 minutes of jogging, at the 9-km point in a total 10-km race, jogger A is behind the leader and moving at the same speed. What would have to be Jogger A's accelearation in order to catch up to the finish line? Assuming the leader ...
*January 10, 2009*

**Physics**

After 35 minutes of jogging, at the 9-km point in a total 10-km race, jogger A is behind the leader and moving at the same speed. What would have to be your accelearation in order to catch up to the finish line? Assuming the leader maintains a constant speed the rest of the ...
*January 10, 2009*

**Physics**

After 35 minutes of jogging, at the 9-km point in a total 10-km race, jogger A is behind the leader and moving at the same speed. What would have to be your accelearation in order to catch up to the finish line? Assuming the leader maintains a constant speed the rest of the ...
*January 10, 2009*

**Physics**

After 35 minutes of jogging, at the 9-km point in a total 10-km race, jogger 1 is behind the leader and moving at the same speed. What would have to be your accelearation in order to catch up to the finish line? Assuming the leader maintains a constant speed the rest of the ...
*January 10, 2009*

**Physics**

A ball moves at 33m/s through a wall of donuts 31 cm thick. It comesout of the donut wall at 18 m/s. How much time does it spend in the wall of donuts? How thick would the wall of dounts need to be to stop the ball entirely? Is the answer 1.3 secondsand the wall would need to ...
*January 10, 2009*

**Physics**

If a fighter jet touches the runway at 220km/h, then decides to brake, and finally comes to a stop at 31 seconds later. What is the shortest runway the fighter jet can land, assuming constant deceleration starting at touchdown? Is the answer 570 meters or am I just totally off
*January 10, 2009*

**Physics**

A jet powered car leaves from Georgia to Virginia , 4600 km away. It goes 1010 km/h. At the same time another jet powered car drives from Virginia to Georgia, but it only goes 750 km/h. Where do the two jet powered cars pass each other? Km from Georgia, use two sigfigs. I say ...
*January 9, 2009*

**Physics**

You gave yourself 35 min to drive 23 miles to the party, but you are caught in traffic and average 20 miles/hour for the first 15 min. What is your average speed for the rest of your journey to the party. I am lost any help in approaching the problem wouldbe great.
*January 8, 2009*

**Physics**

Is the average velocit over a specific timeinterval always half of the instantaneous velocity at the end of the interval. I said False, because if the curveis not linear this would not be true. Would this be a a sufficent answeror am I missing anything.
*January 7, 2009*

**ALGBERA**

Can you help me set it up please?
*January 5, 2009*

**Alegbra**

Please help me solve: [SQRT(x)]=-2 1. [SQRT(2x2 - 1)]=x
*January 4, 2009*

**Math**

Thanks!
*December 31, 2008*

**Math**

Given a polynomial and one of its factors, find the remaining factors of the polynomial. Some of the factors may not be binomials. 169x^3-1690x^2-9x+90; x-10
*December 31, 2008*

**Math(Algebra 2)**

Also, if someone is still avalibe the problem is asking me to factor 2a^2-32
*December 29, 2008*

**Math(Algebra 2)**

Wait actually I meant to put a^2+4a+21 would the answer be a+7 a+3?
*December 29, 2008*

**Math(Algebra 2)**

yeS I did mean to write it the way you put it. Thank you. For the second problem, if I do this 2a^2=32 /2 a^2=16 /^2 a=4?
*December 29, 2008*

**Math(Algebra 2)**

by the way thats 2a^2 squared and a^2 squared. Thanks.
*December 29, 2008*

**Math(Algebra 2)**

All of these are different problems. Please help me. IF you only know one answer to just one problem, that is totally welcome as well. THank you. 5 > |x | + 1 2a2-32 a2 + 4a + 21
*December 29, 2008*

**American History**

Thank you.
*December 29, 2008*

**American History**

July 30,31st 1977, Sept 10, 1977 Those are the only ones
*December 29, 2008*

**American History**

The letters she wrote to her husband John Adams
*December 29, 2008*

**Economy**

Need help here plz. In a private closed economy, if aggregate expenditures equal GDP, then... A = Consumption equals investment B = Planned investment equals to saving. C = Disposable income equals consumption minus saving D = Consumption equals aggregate expenditures.
*December 14, 2008*

**Physics**

John is carrying a shovelful of snow. The center of mass of the 3.00 kg of snow he is holding is 15.0 cm from the end of the shovel. He is pushing down on the opposite end of the shovel with one hand and holding it up 30.0 cm from that end with his other hand. Ignore the mass ...
*December 10, 2008*

**Chem**

will Ne or Xe have a higher boiling point? why?
*December 2, 2008*

**calculus**

a box with no top is to be built by taking a 12''-by-16'' sheet of cardboard and cutting x-inch squares our of each corner and folding up the sides. find the value of x that maximizes the volume of the box
*November 25, 2008*

**Chemistry**

What does fluoride ion have in common with a neon atom and a sodium ion?
*November 21, 2008*

**Chemistry**

h h h h | | | | h---c--C====c---c---h | | | | h h h h This is 2-butene where do I insert the HI for hydroiodic aci?
*November 19, 2008*

**Chemistry**

What would be the whole name of 2-butene and hydroiodic acid. Or the diagram. h h Any help would be greatly appreciated.
*November 19, 2008*

**Chemistry**

What is another name or diagram of 2-butene and hydroiodic acid. Any help would be greatly appreciated.
*November 19, 2008*

**Chemistry**

What is another name ordiagram of 2-butene and hydroiodic acid. Any help would be greatly appreciated.
*November 18, 2008*

**physics**

Determine the tangential speed of a point .4 m from the center of the wheel?
*November 17, 2008*

**Chemistry**

You have the alkane C7H16. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.
*November 15, 2008*

**Chemistry**

You have the alkane C7H17. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.
*November 15, 2008*

**Chemistry**

You have the alkane C6H17. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.
*November 15, 2008*

**Chemistry**

Two people were given 1.75 g salicylic acid and 2.00 mL of acetic anhydride. If the density of acetic anhydride is 1.0820 g/mL, how many grams of aspirin could they have prepared. Is the answer 4.7 g
*November 14, 2008*

**Calculus**

What is the local linearization of e^x^2 near x=1? Is the answer 1+2x
*November 14, 2008*

**Calculus**

A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another mile, it is going 80 mph, and the plane has traveled another 5 miles and is going 500 ...
*November 12, 2008*

**Calculus**

A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another 5 miles and is going 500 mph. At that moment, how fast is the distance between the ...
*November 11, 2008*

**Hard Calculus**

Is the answer then -4 x 10^-13
*November 9, 2008*

**Hard Calculus**

The gravitational force, F, on a rocket at a distance, r, from the center of the earth is given by F=k/r^2 where k = 10^13 newton • km2. When the rocket is 10^4 km from the center of the earth, it is moving away at 0.2 km/sec. How fast is the gravitational force changing ...
*November 9, 2008*

**Hard Calculus**

Is the answer for part B -1C
*November 9, 2008*

**Hard Calculus**

A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase as the dose ...
*November 9, 2008*

**Math Word Problem**

At 6am a few bacteria fall into a can of syrup in a broken garbage bag. The conditions of warmth, moisture, and food are perfect for growth and the population doubles every 20 minutes. By 6pm the bacteria are overcrowded and dry and their food is gone.At what time does the ...
*November 9, 2008*

**Calculus**

The gravitational force, F, on a rocket at a distance, r, from the center of the earth is given by F=k/r^2 where k = 10^13 newton • km2. When the rocket is 10^4 km from the center of the earth, it is moving away at 0.2 km/sec. How fast is the gravitational force changing ...
*November 9, 2008*

**Calculus**

A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase as the dose ...
*November 9, 2008*

**Calculus**

(A) Find the equations of the tangent lines to the circle x^2 +y^2=25 at the points where x=4. (B) Find the equations of the normal lines to this circle at the same points. (The normal line is perpendicular to the tangent line at that point.) (C) At what point do the two ...
*November 7, 2008*

**Calculus**

(a) Find dy/dx given that x^2+y^2-4x+7y=15. (b) Under what conditions on x and/or y is the tangent line to this curve horizontal? Vertical? For part A, I simplifid it to -(2x+4/2y+7) For part B,I am confused on what to do?
*November 7, 2008*

**Implicit Functions**

Find the slope of the tangent to the curve at the point specified. x^3+5x^2y+2y^2=4y+11 at (1,2) So far I simplified it to -(3x^2-10y/5x^2+4y-4) which I think then simplifies to -(8/3). What do I do from here....?
*November 7, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

Find dy/dx of the function 10x^2+4y^2=sqrt(7). Is the answer 20x+8y=0
*November 5, 2008*

**Derivatives**

Find dy/dx for the function, xy-x-12y-3=0. Is the answer -14,I got this from 1-1-12=0, which solves to -14.
*November 5, 2008*

**Calculus**

Suppose f(x) is differentiable at x=a. What does tangent line approximation, y=, mean? Select all that apply (A) Local linearization (B) y=f(x)-f(a)-f'(a)(x-a) (C) The best liner approximation of f(x) near a (D) After zooming y is a good approxiamtion to f(x) (E) f(x)~y=f(...
*November 5, 2008*

**Calculus**

(a) Find the tangent line approximation for sqrt(9+x) near x=0. (b)Find a formula for the error, E(x),in the tangent line approximation found in part (a). For part A, is the answer y=3. For part b, I don't understand , any help would be greatly appreciated.
*November 5, 2008*

**Calculus**

Find the derivative of 10x^2+4y^2=sqrt(7). Is the answer 20x+8y=0
*November 5, 2008*

**Calculus**

Find the derivative of the function, xy-x-12y-3=0. Is the answer -14,I got this from 1-1-12=0, which solves to -14.
*November 5, 2008*

**Calculus**

According to the US Census, the world population P, in billions, is approximately P=6.342e^(0.011t); where t is in years since January 1, 2004. At what rate was the world's population increasing on January 1, 2005? Give your answer in millions per year. Is the answer 6412 ...
*November 5, 2008*

**Engineering/Algebra**

A cardboard tube has a failure stress of 4,960,000 N/m^2 and an axial stress of 75 N/cm^2, find the factor of safety of the tube. Is the answer 66133.33
*November 4, 2008*

**Engineering/Algebra**

A cardboard tube is loaded with a 15.3 N axial load. The tube has an outside diameter of 2.5 cm and a wall thickness of .035 cm. Find the axial stress in the cardboard tube. Is the answer 75 N/cm^2? If so can you show me your way of getting to this answer.
*November 4, 2008*

**Engineering/Algebra**

A balsa wood glider wing has the following properties during flight: Thickness= 0.3175 cm I= 0.0733 cm^4 Moment= 4.2 N-cm Find the bending stress in the wing. Express your answer in N/m^2. Is the answer either 9.096 N/m^2 or 18.192 N/m^2
*November 4, 2008*

**Engineering/ Algebra**

A balsa wood glider wing has the following properties during flight: Thickness= 0.3175 cm I= 0.0733 cm^4 Moment= 4.2 N-cm Find the bending stress in the wing. Express your answer in N/m^2. Is the answer either 9.096 N/m^2 or 18.192 N/m^2
*November 4, 2008*

**Engineering/ Algebra**

A balsa wood glider wing has the following properties during flight: Thickness = 0.3175 cm I = 0.0733 cm^4 Moment = 4.2 N-cm Find the bending stress in the wing. Express your answer in N/m^2. Is the answer 9.09 N/m^2 or 18.19 N/m^2
*November 4, 2008*

**math**

what percent is 23 students out of 51 students and how do you solve it
*October 30, 2008*

**Algebra**

keep it clean here.
*October 29, 2008*

**Calculus**

Explain the global optimization process for a continuous function over a closed interval. Be sure to identify all steps involved and clearly explain how the derivative is utilized in this process. Would this be a good explanation? The process of global optimization refers to ...
*October 27, 2008*

**Calculus**

Explain the global optimization process for a continuous function over a closed interval. Be sure to identify all steps involved and clearly explain how the derivative is utilized in this process. Does this have to do with the first derivative rule or second derivative rule ...
*October 27, 2008*