Wednesday

October 26, 2016
Total # Posts: 515

**Chemistry**

Silicon carbide (SiC) is made by reacting sand (Silicon dioxide, SiO2) with powdered carbon at high temperature. Carbon monoxide is also formed. What is the percent yield if 51.4kg of SiC is recovered from processing 100.0kg of sand? What mass (in kg) of carbon would be needed...

*October 25, 2016*

**Math**

6 softball teams are to play each other once. how many games are needed?

*October 24, 2016*

**Science (Chemistry) (Yield)**

I tried doing some conversion factors and came up with this: (0.101g Mg)(1mol MgO) |(40.31g MgO) ---------------------- (24.31g Mg)|(1mol MgO) =~0.167g MgO as my theoretical yield if I had a mass of 0.101g of Mg Did I do this correctly?

*October 24, 2016*

**Science (Chemistry) (Yield)**

Using your mass of Mg (0.101g), and assuming all of the Mg burns in oxygen and forms the theoretical predicted product, calculate the theoretical yield of magnesium oxide. I wrote out the equation and it turned out to be: 2Mg+O2->2MgO I have my mass of Mg but how do I get ...

*October 24, 2016*

**Physics**

A ball is on the end of a rope that is 1.75 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 78.0° with respect to the vertical. What is the tangential...

*October 23, 2016*

**Chemistry (atoms)**

How many atoms of oxygen, O, are in 0.0595 moles of water?

*October 23, 2016*

**math (horizontal tangent line)**

Determine the point(s) if any at which the graph of the function has a horizontal tangent line. y=x^3+x I graphed this function out and it looks like there isn't any horizontal tangents. Am I correct or am I forgeting something? I tried finding the derivitave of the ...

*October 22, 2016*

**Math (Calculus)**

Determine if each of the following functions is in Big-O, is Big-Omega and is Big-Theta of x: (Could be multiple) a) f(x)=10 b) f(x)=3x+7 C) f(x)=x^2+x+1 d) f(x)=5log(x) e) f(x)=|x| f) f(x)=x/2 I'm in calc 1 and I have no idea what's it even asking me. Help? Thanks in ...

*October 22, 2016*

**Health care tech**

I would say it's all of those. All of your equipment would be useless if there wasn't any software telling them what to do!

*October 21, 2016*

**Math (Calculus)**

Determine if each of the following functions is in Big-O, is Big-Omega and is Big-Theta of x: (Could be multiple) a) f(x)=10 b) f(x)=3x+7 C) f(x)=x^2+x+1 d) f(x)=5log(x) e) f(x)=|x| f) f(x)=x/2 I'm in calc 1 and I have no idea what's it even asking me. Help? Thanks in ...

*October 21, 2016*

**Technology and online learning**

Remember we're looking at its validity of a website. Therefore you wouldn't want biased information. Yeah sure the website may be professional looking, but that doesn't mean that it's valid and genuine. You would want up to date and accurate information instead...

*October 21, 2016*

**Math (Function differentiable)**

Any ideas?

*October 20, 2016*

**Math (Function differentiable) **

Determine whether the function is differentiable at x=2 x^2+1 for x<(or equal to) 2 4x-3 for x>2 I did the math for the limits of both equations and they both approach to 4. So that means they are differentiable right?

*October 20, 2016*

**Math**

The density of water at 21 degrees C is 0.997992 g/mL. The density of water at 22 degrees C is 0.997770 g/mL. What is the density of water if the room temperature is 21.3 degrees C?? So I would just multiply 30 percent of the density at 21 degrees C but I'm stuck on how to...

*October 18, 2016*

**Science (Chemistry) Ratio of mole**

I understand your math, but where did Oxygen started with 2 of them to be O2? Is it because of the charges?

*October 17, 2016*

**Science (Chemistry) Ratio of mole **

You measured out 0.101g of Mg. You heat the sample and measure out 0.234 of the magnesium oxide compound. Given your data, what us the empirical formula for the Mg(x)O(y)? x and y are ratio x:y If I'm doing this correctly, I divided 0.101g of Mg/24.31g of Mg = .00415 mol ...

*October 17, 2016*

**Math (derivative by limit process) **

Find the derivative of the function by the limit process. f(x)=1/sqrt(x) I've worked through my problem and got f'(x) to be -1/2x but the actual answer is -1/2x^3/2? Where did the 3/2 power come from? Any help is greatly appreciated!

*October 16, 2016*

**AMDM1**

The amount of paint a painter needs is directly proportional to the area of the object he is painting. If a painter needs g gallons of paint for every s square feet that he paints, what is the total amount of paint that he needs to paint a house in terms of g and s?

*October 14, 2016*

**Math (Instanttaneous rate of change)**

I see, this was a lot simpler than I expected! Thanks so much

*October 13, 2016*

**Math (Instanttaneous rate of change)**

Compute the instantaneous rate of change f'(a) for the function f(x) at x=a using: f'(a)=lim(h->0) (f(a+h)-f(a))/h f(x)=x^2 at x=3 My teacher didn't even go over the problem since class was over but gave us the answer being 6. How do you approach this problem to...

*October 13, 2016*

**Math/Chemistry**

Aren't we supposed to multiply 50.0g by 0.001? Where did 1E^-5 come from?

*October 11, 2016*

**Math/Chemistry**

Your friend eats 50.0g tuna steak. You find out that the tuna is 0.001% (by mass) mercury. The lethal dose of mercury is 5.5x10^-3 mg of mercury. Should you take your friend to the hospital?

*October 11, 2016*

**Math (Limits)**

Consider the following function. f(x) = 2x^2 − 8x Find the limit. lim (Δx->0) (f(x+Δx)-f(x))/(Δx) How would I set up the equation to work with that function? I know how to plug in the values usually, but how would I do this for that function ...

*October 11, 2016*

**Math**

$20.00-$9.50=$10.50 The customer will receive $10.50 in change for paying a movie ticket at $9.50 with a $20.00 bill.

*October 11, 2016*

**Math (Continuity)**

Got it, thanks for the help!

*October 6, 2016*

**Math (Continuity)**

Find the x-values (if any) at which f is not continuous. Which of the discontinuties are removable? f(x)=(x)/(x^2-4) I'm not sure how to do this problem but I know that it is not continnous at x=2?

*October 6, 2016*

**Math (Expanding logarithms) **

Use the properties of logarithms to expand this functiion? ln[ (x^2+1) (x-1) ] So assuming this is a multiplication problem, I would be using the product rule for expanding logs. I tried applying the product rule but I'm not sure if this is correct or not? ln(x^2+1)+ln(x-1)

*October 6, 2016*

**Science (Chemistry) (Measurement Uncertainty)**

Anyone?

*October 3, 2016*

**Science (Chemistry) (Measurement Uncertainty)**

It's the mass of a coin, not coon*

*October 3, 2016*

**Science (Chemistry) (Measurement Uncertainty)**

Three students are asked to determine the mass of a coon. They each measure different values for the mass of the coin using a balance. Student A recorded a mass of 63.08g, student B recorded a mass of 63.022g and student C recorded a mass of 63.0328g. If the balance is ...

*October 3, 2016*

**Math (Limits)**

Alright thanks, just wanted to double check because for some reason my teacher only allows us one attempt on each question on our online homework. Life is so unfair.

*October 2, 2016*

**Math (Limits)**

I'm not sure either. But I think it is more of a hypothetical question because another question asked me: "What is the limit of f(x)=7 as x approaches pi?" and that answer was 7.

*October 2, 2016*

**Math (Limits)**

What is the limit of g(x)=x as x approaches pi? Would it just be pi??

*October 2, 2016*

**Math (Domain and range)**

Evaluate the function f(x)={9x+5, x<0 {9x+6, x>(or equal to)0 Determine its domain and range using interval notation? I believe the domain is (-infinity,infinity) but how would I find the range?

*October 2, 2016*

**Math (Perpendicular equation)**

Write the equation for the line through the given point and perpendicular to the given line. Point: (4/5,9/10) Line: 6x-4y=0 I tried doing this problem and got 0=-4/6x-y+43/30 as the perpendicular equation. Is this correct?

*October 2, 2016*

**Math (Secant Lines)**

Any ideas?

*October 1, 2016*

**Math (Secant Lines)**

So far I tried to figure out the slope of each secant line: For x=1 the slope is 1/3 For x=3 the slope is 2-sqrt(3) For x=5 the slope is sqrt(5)-2

*October 1, 2016*

**Math (Secant Lines)**

Consider the function f(x)=sqrt(x) and the point P(4,2) on the graph of f? -Consider the graph f with secant lines passing through p(4,2) and Q(x,f(x)) for x-values 1, 3, and 5. -Find the slope of each secant line -Use the results to estimate the slope of the tangent line to ...

*October 1, 2016*

**Math (Condensing logarithmic expression)**

Write the expression as the logarithm of a single quantity 3[(ln x) -2ln(x^2+1)]+2 ln 5?

*October 1, 2016*

**Math (Expanding logarithmic expression)**

Use the properties of logarithms to expand the logarithmic function ln[(x^2+1)(x-1)] Would this be the correct answer? ln[x^3-x^2+x-1] I can't seem to expand it any further than that.

*October 1, 2016*

**Math (Finding points of intersection)**

Thanks for the correction! I understand now

*October 1, 2016*

**Math (Finding points of intersection)**

Find the points of intersections of these equations? x^2+y^2=1 -x+y+1 This is what I've done so far, I isolated the y's out y= +/- sqrt(1-x^2) y=x+1 But I am stuck on how to make them together in order to find the point of intersection, any help is greatly appreciated!

*October 1, 2016*

**Math (Trig Review)**

Evaluate the expression without using a calculator (Make a sketch of a right triangle) tan(arccot 2) Thanks in advance! I'm trying to refresh my memory of these kinds of problems and I'm having trouble on how to solve this problem

*September 30, 2016*

**Math**

In how many different ways can six of ten people be seated in a row of six chairs? I don't have the answer, but from my rough understanding of permutations and combinations, I got: 10C6 * 6! = 210 * 6! I figure first 6 people have to be chosen out of the 10, and that can ...

*September 26, 2016*

**math**

1/4 mile long and 1/4 mile wide. so he had 16 fields in the beginningng

*September 16, 2016*

**math**

suppose the farmer buys another 1/2 square mile of land and divides all his land into square fields 1/4 mile long and 1/4 mile wide. how many fields will he have?

*September 16, 2016*

**algebra **

Ms. Kork sold her car for $8700. This was $100 more than 2/5 of what she paid for the car originally. How much had ms. Kork paid for the car??

*September 15, 2016*

**algebra**

The pressure on a scuba diver at sea level is 14.7 pound psi.The pressure increases 0.0445 psi for each foot of depth. Suppose the diver is 32.5 psi. How deep is he?

*September 15, 2016*

**English**

Did Lucy really say I refuse to ride with Tom? Should there be quotation marks before I and after the question mark?

*September 8, 2016*

**algebra**

the probability of winning a particular game at the game store is one fourth. fine the odds of winning the game

*August 14, 2016*

**History**

What are unintended outcomes of Federal Indian Boarding Schools?

*June 8, 2016*

**Math (Polar to Cartesian Equation)**

Convert the given polar equation to a Cartesian equation. r^2=4sec(theta)csc(theta)

*June 7, 2016*

**Help please?**

Any ideas anyone?

*June 3, 2016*

**Math (Parametrics)**

I know setting x(t)=cos(t) and y(t)=-sin(t) will make the circle travel clockwise but I'm not sure exactly on how I can make it start at the specific point (0,1)?

*June 3, 2016*

**Math (Parametrics)**

Find the parametric equations of a unit circle where you start at point (0,1) at t=0 and you travel clockwise with a period of 2π? x(t)=? y(t)=?

*June 3, 2016*

**Math (Vectors)**

In this case, would a=-15 and b=3?

*May 26, 2016*

**Math (Vectors)**

Determine the values of a and b in the following vectors for the indicated property. m=<10,a,15> and n=<2,-3,b> and vector m is parallel to vector n. Thanks in advance!

*May 26, 2016*

**Math (Vectors)**

Thanks for the help! I wanted to ask how did you know that we're supposed to divide (7.2/5.7) and not the other way around?

*May 23, 2016*

**Math (Vectors)**

Consider the vector v=-5.7i-7.2j Approximate to the nearest tenth of degree the angle vector v makes with the positive horizontal direction?

*May 23, 2016*

**Math**

A father who is 42 years old has a son and a daughter. The daughter is three times as old as the son. In 10 years the sum of all their ages will be 100 years. How old are the two siblings at present? Please help quick!

*May 10, 2016*

**Chemistry **

How many grams of solute are present in 795 ml of 0.130m KBr?

*May 4, 2016*

**LIFE ORIENTATION **

The question below is based on the recent corruption activities by our former president Jacob Zuma related to Nkandla. Evaluate the physical, social and economic consequences of this crime to the offender. How did this corruption and fraud impact negatively in the country: for...

*April 30, 2016*

**(Arts/Theater)(Stuck on what to do) Help please?**

Thanks for your possible ideas! Maybe drawing might work since that's pretty simple. I'm terrible at drawing but I think I could come up with something with that. Suppose copying a simple drawing would take about 10 minutes.

*April 25, 2016*

**(Arts/Theater)(Stuck on what to do) Help please?**

I suppose tying a tie might work. Would that really take 10 minutes to complete that action though? haha

*April 25, 2016*

**(Arts/Theater)(Stuck on what to do) Help please?**

My improvisation teacher today told us to bring something with us to class where you can do a physical action with it. This action must be something you can do in barely 10 minutes and must have an actual ending to that action. We're doing this assignment tomorrow and I ...

*April 25, 2016*

**Writing Sentences and Paragraphs**

Another edit... Paragraph 1 I am applying for the position of Data Entry in the Archives Department at DC Comics because of the enthusiasm I have for my hobby of collecting and cataloguing comic books. While I was studying as a Library Technician at Fanshawe College, I ...

*April 25, 2016*

**Writing Sentences and Paragraphs**

This is my 2nd revision of Paragraph 1 ...any feedback and suggestions would be appreciated. Paragraph 1 The enthusiasm I have for my hobby of collecting and cataloguing comic books is why I am applying for the position of Data Entry at DC Comics. While I was studying as a ...

*April 25, 2016*

**Writing Sentences and Paragraphs**

I deleted a couple of things...these are the individual sentences I have so far... The enthusiasm I have for my hobby of collecting and cataloguing comic books is why I am applying for the position of Data Entry at DC Comics. While I was studying as a Library Technician at ...

*April 25, 2016*

**Writing Sentences and Paragraphs**

As an individual with experience performing office clerical duties and educated as a Library Technician, I am excited to apply for the position of Data Entry Clerk as advertised on the DC Comics website. I consider that my experience and skills match ver well with your ...

*April 25, 2016*

**Math 142 (Pre-Cal) (Circles)**

A wheel has a radius of 10 inches is rotating with an angular velocity of 2.5 revolutions per second. Find the distance the wheel travels in 15 seconds.

*April 12, 2016*

**Math 142 (Pre-Cal) (Circles)**

Is my answer correct? w=(29/1)(2pi/1) w=~182.2124 rad/min v=(1.8)(182.2124) v=~327.9823 feet/min

*March 31, 2016*

**Math 142 (Pre-Cal) (Circles)**

A wheel spins through 29 revolutions per minute. Find the angular velocity and the linear velocity if the radius of the wheel is 1.8 feet. w=? (rad/min) v=? (feet/min)

*March 31, 2016*

**statistics**

Find the following: P(z > 2.43)

*March 16, 2016*

**Statistic**

What percentage of the area of the standard normal distribution is between z = -2.00 and z = +2.00? How do you know this?

*March 16, 2016*

**Statistics**

In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 25 patients using the drug is selected. Find the mean and standard deviation of patients having a mild side effect. Mean = np = 25(.2) = 5 Ok Standard ...

*March 11, 2016*

**Math (Pre-Cal)**

The number of Sasquatch living in northern Ecotopia t years after 2016 is given by the formula s(t)=3(1.12)^t . Determine how long it will take for the Sasquatch population to double. Do this algebraically?

*February 25, 2016*

**physics-please answer**

A coconut thrown horizontally at 20 m/s from the top of a hill 63 m high. How far from the base of the hill does the coconut hit the ground? Select one: a. 42 m b. 13 m c. 66 m d. 72 m

*February 24, 2016*

**Math (Pre-Cal) (Exponential Functions)**

A car was valued at $38,000 in the year 2003. The value depreciated to $11,000 by the year 2009. Assume that the car value continues to drop by the same percentage. -What will the value be in the year 2013?

*February 19, 2016*

**math (pre calc)**

Imagine that you are driving 150 miles and you want your average speed for the trip to be 60 miles per hour.Imagine that you drive the first half (by distance) of the trip at 50 mph. How fast must you drive on the second half to make your average speed for the whole trip 60 ...

*February 16, 2016*

**Pre-Calc Help please?**

Thanks for replying Steve I just wanted to ask how did you get p(n) = (n - 107/12)/(n - 100/12) after solving for b and c?

*February 16, 2016*

**Chemistry**

Consider the thermal decomposition of potassium chlorate. 2 KClO3(s) ---> 2 KCl(s) + 3 O2(g) A mixture containing KCl and KClO3 weighing 1.80 g was heated producing 1.40 x 102 mL of O2 gas at STP. What percent of the original mixture was KClO3?

*February 7, 2016*

**maths**

I am a two digit no. If you subtract my second digit from my first digit the difference is 6. (i.e. 9-3= 6 or 8-2=6 or 7-1=6) The product of my digit is 0. What number am I? Could you please answer it as I did not understood the meaning of product of my digits is zero.

*January 23, 2016*

**Chemistry**

No answer

*January 17, 2016*

**math**

A cat can walk 2,190 miles in 2 hours. How can 2,190/2 be written in expanded form? 1) 2,000+100+90/2 2)200+90+1/2 Write it in quotation form.

*January 5, 2016*

**Statistics**

1/15

*December 15, 2015*

**definite integral**

approximate the value of the integral by use of the trapezoidal rule. n=8 a=0 b=4 sqrt 16-x^2

*December 10, 2015*

**Math word problem**

17 1/9 decreased by what number is 5 2/3? This is the answer I have 11 4/9. Is this correct.

*November 21, 2015*

**chemistry**

Raising the temperature of a reacting system increases the rate of the reaction, but does NOT increase the:

*October 1, 2015*

**english plz plz help**

"When greek meets greek" is the story

*August 18, 2015*

**english plz plz help**

Which of the following lines of dialogue best reveals Ram's false heritage to the landlord? a. "You look like a man who could tell me the right place to go." b. "I am an Untouchable from the heart of India." c. "Man is forever studying ways and ...

*August 18, 2015*

**Chemistry**

How many moles of acetic acid are present in 10.00 mL if the concentration is 0.500M HC2H3O2?

*August 12, 2015*

**drivers ed test**

is it the first one?

*August 11, 2015*

**drivers ed test**

3. one way the national highway safety act helps drivers nationwide is by providing guidelines for maintenance on national highways requiring that all drivers have a federal drivers license providing drivers with insurance setting graduated drivers license privileges

*August 11, 2015*

**ANIMAL VEGETABLE MIRACLE**

What does Kingsolver receive for her birthday? What does she do with it? (106-107) What unusual package does Kingsolver receive at her local post office? (87)

*June 6, 2015*

** math**

Jerry is packing cylindrical cans with diameter 6 in. and height 10 in. tightly into a box that measures 3 ft by 2 ft by 1 ft. All rows must contain the same number of cans. The cans can touch each other. He then fills all the empty space in the box with packing foam. How many...

*April 14, 2015*

**criminal justice**

I'm looking for this same question...

*April 13, 2015*

**Math - hw check**

The admission fee for student is $8 and the admission fee for Adult is $15. In one hour, 12 adults and students enter the museum and a Total of $131 in admission was paid. Write a linear system to model this problem and solve this problem graphically. Check you answer by ...

*April 2, 2015*

**circle and the Pythagorean theorem**

tangent PT, QM = 12, M < P = 30°

*March 22, 2015*

** Math**

Can someone please help. How log will it take you to save $100,000 if you start saving 1597 every 3 months starting today? Assume and interest rate of 6% compounded quarterly. Business Calculator py/cy= 4 I=6% fv= 100,000 1597= PMT BGN is on

*March 4, 2015*

**Vocabs**

Thank you

*February 22, 2015*