Wednesday

September 28, 2016
Total # Posts: 413

**College Statistics**

For X ∼ Bin(n, p), show that E(X) = np and Var(X) = np(1 − p) Our book defines this as true, but I don't know how to actually prove it.

*September 30, 2013*

**geometry**

In step 4 of the construction of a perpendicular line through a point, why must the compass point be placed on the points where the arc intersects with the original line? How would the construction be different if the compass point were placed at random points on the original ...

*June 26, 2013*

**Physics**

Which of the following is correct for the two coherent light waves to produce zero light?

*May 31, 2013*

**algebra 1**

Circle the most appropriate description. 27.A city planning commitee surveys 100 people waiting at a bus stop about the expansion of the public transportation system. Random Sample,systematic sample,self-selected sample, convenience sample, bipartisan sample,stratified random...

*May 20, 2013*

**CHEMISTRY**

commercial HCL IS SOLD AT 37% WITH SPECIFIC GRAVITY OF 1.18.HOW WILL YOU PREPARE 5OML FOR 100STUDENTS AT THE CONCENTRATION OF 0.25M

*May 17, 2013*

**CHEMISTRY**

commercial HCL IS SOLD AT 37% WITH SPECIFIC GRAVITY OF 1.18.HOW WILL YOU PREPARE 5OML FOR 100STUDENTS AT THE CONCENTRATION OF 0.25M

*May 17, 2013*

**Algebra 1**

For each event,circle the most appropriate term. 21. Six friends go to a movie.How many ways can they sit in a row of six seats? counting principle,combination,factorial, or permutation

*May 15, 2013*

**general**

how can the plan of action help you address a current problem or challenge you are having with school

*May 15, 2013*

**Chen=mistry**

Sodium metal reacts violently with water to form NaOH and release hydrogen gas. Suppose that 3.00 g of Na reacts completely with 3.00 L of water and the final volume of the system is 3 L. What is the molarity M of the NaOH Solution formed by the reaction?

*May 1, 2013*

**Completing the sentence**

Balk

*April 29, 2013*

**Completing the sentence**

Since I'm afraid of the heights, I usually -------- at the idea of sitting in the first row of the topmost balcony in a theater.

*April 29, 2013*

**Math**

David and Joseph have a total of 328 marbles. Matthew and David have 176 marbles. Joseph has 5 times as many marbles as Matthew. How many marbles does Davis have?

*April 2, 2013*

**chemistry**

Calculate the temperature at which it is thermodynamically possible for C (s) to reduce iron(III) oxide by the reaction: 2Fe2O3 (s) + 3 C (s) ---> 4Fe (s) + 3CO2 I don't need a specific answer, but I'm not sure how to approach the problem. I'm assuming it has to...

*February 28, 2013*

**human development**

which one of the following expressions best illustrates overregularization?

*January 31, 2013*

**Accounting**

how do you classify what the cost to set up a manufacturing facility as? is it general, selling and administrative and what type of cost is it? Please Help.

*January 19, 2013*

**Chemistry**

What is Mass % of an aqueous NaOH solution in which molality of NaOH is 16.7m? Density of the solution is 1.4339g/ml

*January 13, 2013*

**Chemistry**

Solutions are made that contain 0.1 moles of each of the following compounds below in 100g of H20. Choose the compound whose solution will have the lowest freezing point? NaBr CO2 KClO3 MgCl2 MgSO4

*January 13, 2013*

**Chemistry**

Which of the following solutions would have the highest osmotic pressure? 0.15 M KCl 0.2 M C6H12O6 0.2 M C12H22O11 0.2 M CH3COOH 0.15 M CaCl2

*January 13, 2013*

**Intergrated Algerbra**

A caterpillar and snail are 300 ft apart. They meet face to face in 5 hours. What were their speeds?

*November 29, 2012*

**Physics **

a net force of 3.50 N acts on a 2.75 kg object. what is the acceleration of the object?

*November 29, 2012*

**science**

How many grams of citric acid is needed to titrate 20ml NaOH 0.05M their mole ratio is 1:3 respectively

*November 28, 2012*

**algebra**

Completely factor the following expressions. 1. 256z^2-4-192z^2+3 2. 2a^2c^3-14bc^3+32c^3d^2 3. 35g^2+6g-9 4. 3j^3-51j^2+210j

*November 28, 2012*

**algebra**

Completely factor the following expression.1.) 5c^2-24cd-5d^2

*November 28, 2012*

**algebra**

Completely factor the following expression.1.) 5c^2-24cd-5d^2

*November 28, 2012*

**algebra**

Completely factor the following expression. 1.4x^2-8x-12+6x

*November 28, 2012*

**Chemistry**

What is the general trend in the acidity of Period 3 oxides moving across the Periodic table from left to right? (Be sure to refer to the term acidity.)

*November 27, 2012*

**math**

2x squared plus 6 x plus 3 is equal to 0.....

*November 26, 2012*

**Medical coding**

What icd-9 procedure code is used for a hemilaminectomy medial facetectomy and foraminotomy?

*November 18, 2012*

**Algebra 1**

Christopher orders a 3 topping pizza for $15.25 and a 5 topping pizza for $17.75. Write and solve a system of linear equations to find the price of a plain pizza( no toppings) and the cost of each topping.

*November 14, 2012*

**Algerbra 1**

You have a coupon for $50 off your camera purchase of $100 or more at Zeke's Camera World. Write a function relating a camera's purchase price, y, to the retail price, x. Give the domain of this function.

*November 14, 2012*

**alegbra 1**

Solve the following systems of linear equations using algebraic method. 1)3y=11-2x 3x=y-11 2)8x-6y=14 12x-9y=18

*October 31, 2012*

**alegbra 1**

Solve the following system of linear equation using any algebraic method. 2x+5y=3 X-3y=7

*October 31, 2012*

**alegbra 1**

Solve the following system of linear equation using any algebraic method. 2x+5y=3 X-3y=7

*October 31, 2012*

**alegbra 1**

Solve the following system of linear equation using any algebraic method. 2x+5y=3 X-3y=7

*October 31, 2012*

**alegbra 1**

Solve the following systems of linear equations using any algebraic method.If possible,check your solution. 1)2x+5y=3 X-3y=7 2) 3y=11-2x 3x=y-11 3)8x-6y=14 12x-9y=18

*October 30, 2012*

**Math**

Some chickens, cows, and sheep are in a field. Their number of legs is 12 more than twice their number of heads. How many 4 legged animals are in the field?

*October 25, 2012*

**algebra 1**

Natalie performs a chemistry experiment where she records the tenperture of an ongoing reaction.The solution is 93.5 C after 3 minutes;90 C after 5 minutes,84.8 C after 9 minutes; 70.2 C after 18 minute; 54.4 C after 30 minutes;42.5 C after 37 minutes; and 24.9 C after 48 ...

*October 24, 2012*

**algebra 1**

1. Solve the linear system using substitution. 4x-y=5 4x+4y=-4

*October 23, 2012*

**AP US History**

well ms.sue the fact that she can't answer the question doesn't mean she doesn't have the potential to be in an AP class.

*September 26, 2012*

**Math**

Shoe me the steps to solvethe problem 12 divided by 1/4 to the second power

*September 17, 2012*

**chemistry**

what is the formula to determine the mass of propane that must be combusted in order to produce 188.23kJ of energy?

*August 11, 2012*

**math**

Try drawing a venn diagram and placing the numbers you have inside the circles for individual subjets.Then see how the numbers compare to the total number of students.

*August 11, 2012*

**english**

The answer is D because a slant rhyme is a "rhyme in which either the vowels or the consonants of stressed syllables are identical". Firm and Room have the final 'M' sound in common.

*August 11, 2012*

**science**

the experiment could be repeated with the same mice

*August 6, 2012*

**hEALTH**

B. If you write down what you consume and look at the package (or go online for resteurant food or fruits and vegetables) to see how many calories it has then you can keep a detailed record. The reason C doesn't work is that every one's body, metabolism,diet, and ...

*August 1, 2012*

**math**

What is the surface area of a rectangular prism measuring 3 1/2 ft.by 2 3/8 ft. by 8 feet ?

*July 20, 2012*

**math**

Thank you so much!

*July 20, 2012*

**math**

What is the surface area of a rectangular prism measuring 3 1/2 ft.by 2 3/8 ft. by 8 feet ?

*July 20, 2012*

**math**

Find the volume in cubic feet of the right rectangular prism measuring 3 1/2 by 8 feet by 2 3/8 feet

*July 20, 2012*

**algebra 1**

Label each statement true or false if false correct the underlined portion.If -4<-2t+6<10,then this is the underlined 2>t+6>-5. If this is underlined |y+8|+2=6,then this not underlined y+8=_+4. Translate and solve. the absolute value of three times a number,n,is ...

*July 13, 2012*

**stat**

Find the area under the standard normal curve to the left of z = 1.88, P(z < 1.88). (Give your answer correct to four decimal places.)

*July 7, 2012*

**prealgbra**

brandon needs $480 to buy a tv and stereo system for his room.He received $60 in cash for birthday presents. he plans to save $30 per week from his parttime job.to find how many weeks w it take to have $480, solve 60+30w=480

*June 28, 2012*

**algebra**

Christine went shopping and brought each of her eight nephews a gift , either a video costing 14.95 or a cd costing 16.88. she spent 133.41 on the gifts. How many videos and how many cds

*June 4, 2012*

**Chemistry**

Does ph differ with changes in concentration?

*April 20, 2012*

**Chemistry**

What is the pH of a 0.0353M solution of NH4F and a 0.0000666M solution of NH4F?

*April 20, 2012*

**Math Probability dice roll**

two fair dice are rolled, find the A)odds of getting a 9 B) the odds against getting a 12

*April 16, 2012*

**trig**

171km

*March 11, 2012*

**trig**

City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?

*March 11, 2012*

**trig**

City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?

*March 11, 2012*

**trig**

City A is 300km due east of city B. City C is 200km on a bearing of 123¤ from city B. How far is it from C to A?

*March 11, 2012*

**language arts**

that is actually true, but why is it so popular? could it be because of the brand name, or advertisement?

*February 27, 2012*

**language arts**

i'm doing a project on choosing some "status symbols" popular in society today. one status symbol i did was the restaurant called cheesecake factory, how do i explain how it is popular/important today?

*February 27, 2012*

**Pre-Algebra Math**

50

*February 21, 2012*

**comparing group means**

what appropriate null and alternative hypothesis would i use in this problem a teacher gives students a holding review session. did attending the session make a differnts in the final points in the class,give example of the appropriate statisical procedure

*February 18, 2012*

**math**

One number is 25% of another. The larger number is 12 more than the smaller. What are the numbers?

*February 16, 2012*

**Algebra**

The Hansons are considering two possible vacation destinations. A trip out west will cost $1075 in total airfare plus an average of %450 per day in expenses. A trip south will cost $1500 in total airefare plus an average of $365 per day in expenses. How many days should they ...

*February 15, 2012*

**English Home Language**

Can You Please Give Me Points as To How to add persuasive points to my speech " Women Should Rule The Way" I Already said they more Patient and better communcaters

*February 10, 2012*

**5th grade math**

A class consist of half as many boys as girls, if there are 14 boys how many girls are there

*November 17, 2011*

**chemistry**

the number of grams of KCI per 100g of water that would produce a saturated soluion at 50 degrees C is?

*November 15, 2011*

**Geometry**

need to find x x+153=130+2x+23

*September 29, 2011*

**geometry**

suppose m is b/t L and N. LM=4x+8, MN=9x-4, LN=82. what is x?

*September 25, 2011*

**history**

what was The Significance of Noah Webster thinking and writing

*August 31, 2011*

**math**

what is the least possible number you can weite with a 1 in the thousands place?

*August 25, 2011*

**Chemistry**

When oxygen expands from the liquid to gaseous state how much more volume does it occupy?

*July 30, 2011*

**think build live success**

I am currently enrolled in uma and Im trying to figure out my instructor because there is lack of commmunication on her part

*July 24, 2011*

**College Math**

Given the following sets select the statement that is NOT true. A=(l,a,t,e,r) B= (l,a,t,e) C=(t,a,l,e) D=(e,a,t)E=(t,e,a) E=D E=B D=A C=A D=B

*July 15, 2011*

**statistics**

Make up 20 hypothetical scores. Determine their mean, median, mode, and standard deviation.

*June 24, 2011*

**maths**

Please can you help me with this question? Choose the option which is a false statement: A arctan(tan2/3pi))=-1/3pi B arccos(cos(3/4pi))=3/4pi C sin(arcsin(-1/2pi))=-1/2pi D arcsin(1/2squareroot3)=1/3pi E arcsin(sin(3/4pi))=1/4pi F arccos (1/2squareroot2)=1/4pi

*May 26, 2011*

**science**

if a plane drops a bomb, does the bomb fall straight down, or behind or forward?

*May 18, 2011*

**chemistry**

A 14.0g of N2 occupies what volume atSTP

*May 16, 2011*

**Calculus**

THe demand funtion is modeled by D(q) = 56e^-0.000012q, where q is quantity and D(q) is price. What price will yield the maximum revenue? Prove this is a maximum using as qppropriate derivative test.

*May 11, 2011*

**Calculus**

Evaluate integral, don't use calculator. I'll use the S as the sign for integral S 4 sin (theta)d(theta) from pi/2 to pi I know the answer is 4 because I enter it in on my calculator, but don't know the steps to get to the answer. Please help.

*May 9, 2011*

**Calculus**

Yeah. Thanks for showing me the steps

*May 9, 2011*

**Calculus**

The area bounded between the line y=x+4 and the quadratic function y=(x^2)-2x. Hint: Draw the region and find the intersection of the two graphs. Add and subtract areas until the appropriate area is found. I found the intersection points as (-1,3) and (4,8). I'm not sure ...

*May 9, 2011*

**Calculus**

Thanks.

*May 9, 2011*

**Calculus**

Find the limit. lim x-->1 (x^3)-1/((5x^2)+2x-7) Please show steps.

*May 9, 2011*

**calculus**

Quadratic function written in standard form where a, b, and c are constants such that a is not zero. f(x)= ax^2+bx+c Using calculus find the vertex of the parabola formed by this quadratic function. Determine under what conditions this vertex is a maximum or minumum (using ...

*May 8, 2011*

**math**

Suppose a state lottery prize of $2 million is to be paid in 20 payments of $100,000 each at the end of each of the next 20 years. If money is worth 9%, compounded annually, what is the present value of the prize?

*May 1, 2011*

**Algebra**

Use the five steps for problem solving to answer the following question. Show all work. Andrew is having an irrigation system installed in his yard. Company A charges $1250 plus $15 per sprinkler head. Company B charges $1200 plus $17 per sprinkler head. How many sprinkler ...

*April 28, 2011*

**Calculus--Please help.**

Carry on with the problem.. To find maximum profit, not revenue, would I take the derivative of the profit function, which I have as Profit=125*(12L+29L^2-1.1^3)-7000L. If I take the derivative of this(which I'm not sure I did right) my L=16.78 or .79. If I plug it back ...

*April 21, 2011*

**Calculus--Please help.**

1. So this is the answer I got 12L+29L^2-1.1L^3=0 L(12+29L-1.1L^2)=0 L=0, 26.77, -0.41 The minimum number of laborers would be 0. The maximum number of laborers would be 26.77. THe range would then be (0,26.77) because when I substitute a number >26.77 into the above ...

*April 21, 2011*

**Calculus--Please help.**

I really need help, this is my second post. Information to solve problems Q=12L+29L^2-1.1L^3 Q= # of cars produced/year L=# of laborers used per year for production Each car sells for $125. $7000 per laborer per year is cost for labor and other consumable materials. Questions...

*April 21, 2011*

**Calculus**

Information to solve problems Q=12L+29L^2-1.1L^3 Q= # of cars produced/year L=# of laborers used per year for production Each car sells for $125. $7000 per laborer per year is cost for labor and other consumable materials. I attempted some parts of these questions and some ...

*April 21, 2011*

**Calculus**

Find any absolute max/min and local max/min for the function f(x)=x^3-4x+5 on the interval [0,5). Made sure to prove that these points are max/min values. This is what I did so far. f'(x)=3x^2-4=0 3x^2=4 x= 2/sqrt3 The -2/sqrt3 is outside of interval so can't use. x=2/...

*April 18, 2011*

**Calculus**

The position in meters of a particle is given by f(t)= 14t-3t^2, where t is measured in seconds. a) Evaluate f'(2) and interpret the results. This is how I solved this. f'(t)=14-6t= 2(7-3t) f'(2)=2(7-3(2))= 2 This means the velocity of the particle is 2 m/s when t=...

*April 18, 2011*

**accounting**

(TCO 8) Partial balance sheets for ABC Company and additional information are provided below. ABC Company, Partial Balance Sheets, As of December 31 2009 2008 Equipment $100,000 $75,000 Accumulated depreciation (25,000) (20,000) Common stock, $5 par 180,000 100,000 Paid in ...

*April 18, 2011*

**Calculus**

Bosnian, Thanks for your help. I just want to make sure I understand. The local min and max are the same f(2/sqrt3) = 1.92 Are there any absolute maximum or minimum? Thanks again.

*April 17, 2011*

**Calculus**

Find any absolute maximum and minimum and local maximum and minimum for the function f(x)=x^3-4x+5 on the interval [0,5). Make sure to prove that these points are max/min values. THis is what I did. f'(x)=3x^2-4=0 x= +/- 2/sqrt3 -2/sqrt3 is outside of interval so just use ...

*April 17, 2011*

**Calculus**

Use Newton's Method to approximate the root of the function f(x)=e^x-5x when the intial point chosene is x1=1.5. Do two iterations. This is what I did, but not working. f'(x)=e^x-5 x2=1.5 - (e^1.5-(5(1.5))/e^1.5 -(5)) =1.5-(4.4817-7.5/4.4817-5)=1.5-5.8234= -4.3234 x3=-...

*April 17, 2011*

**Calculus**

let f(x)=x^3(e^-x) Answer using calculus, use graphing calculator only to check work. a) Find the local and global extrema of f. b) Find the intervals where f is increasing/decreasing. c) Find the inflection points of f. d) Find the intervals where f is concave up/down. e) ...

*April 17, 2011*