# Posts by Christina

Total # Posts: 928

**math**

Alex came home after school one day and found that his mother had left a plate of cookies. Alex ate 1/4 of the cookies. When his sister Bernice came home, she ate 1/3 of the remaining cookies, and when Carla came home, she ate 1/2 of the cookies on the plate. When their mother...

*October 31, 2012*

**math**

Below are the median prices of homes sold in 2009, by region of the country. South 158,300 Northeast 248,800 Midwest 139,500 West 243,200 U.S. 180,100 The median selling price of a home in the South was approximately what fraction of the median selling price of a home in the ...

*October 31, 2012*

**math**

Name three factors of 100,000,000 that are not multiples of 10.

*October 26, 2012*

**math**

If 72 divides m, what other numbers must divide m? If 55 divides m, what other numbers must divide m? (Enter your answers as a comma-separated list.)

*October 26, 2012*

**math**

The factors of a number include 9, 12, and 20. What is the smallest number this could be? List all the factors of this number

*October 26, 2012*

**math**

The GCF of two numbers is 15. Their LCM is 450. What are the two numbers? (Enter your answers as a comma-separated list.)

*October 26, 2012*

**math**

A child has a large supply of dominoes, each of which measures 16 millimeters by 88 millimeters. She wants to lay them out to form a solid square, and she wants them all to be laid out horizontally. What will be the dimensions of the smallest square that she can form, and how ...

*October 26, 2012*

**math**

George vacuums the rugs every 18 days, mows the grass every 9 days, and pays the bills every 15 days. Today he did all three. How long will it be before he has another day like today?

*October 26, 2012*

**math**

Ann and Bob are cycling on a track. Ann completes one lap every 15 seconds, and Bob completes one lap every 18 seconds. When will Ann lap Bob, assuming that they started together?

*October 26, 2012*

**math**

I am thinking of a two-digit number in which the sum of the digits is 9 and the number is even. These clues alone do not create one answer. Add one more clue so that there is only one answer. Both digits are divisible by 2. The difference of the digits is 2. Both digits are ...

*October 26, 2012*

**math**

A manufacturer sells widgets, each of which is packaged in a box whose dimensions are 8 centimeters by 8 centimeters by 8 centimeters. Design the dimensions of a box to ship widgets. Your box must hold at least 1000 widgets. (Enter your answer in the form length, width, height...

*October 26, 2012*

**math**

Suppose the U.S. federal debt was $9,400,000,000,000. Let's say that the decision was made to reduce the debt by $10 million per day. How long would it take to pay off the debt at this rate? (Round your answer to the nearest year.)

*October 10, 2012*

**math**

In order to make the most accurate calendar, the following system was devised. Leap years occur every 4 years except for years ending in 00, but years divisible by 400 are leap years. In this case, the year is a leap year if it is divisible by 400. Which of the following years...

*October 10, 2012*

**math**

This problem from China is almost 2000 years old: Find a number that when divided by 3 gives a remainder of 1, when divided by 5 gives a remainder of 4, and when divided by 7 gives a remainder of 2.

*October 9, 2012*

**math**

When items in a box are put in groups of 3 or 5 or 6, there is always 1 item left over. How many items are in the box if there are fewer than 50?

*October 9, 2012*

**chemistry**

A STUDENT STUDYING THE FE+3- HSCN equilibrium put into a test tube 10.00ml of 2.00 x 10-3 M Fe(NO3)3 with 10.0 mL of 2.00 x 10-3 M HSCN.THE H+ in the resulting solution was manteined at 0.500.By spectrophotometric analysis of the equilibrium solution, the equilibrium ...

*September 29, 2012*

**Sociology**

Discuss the conclusions of Margaret Mead concerning temperament, and explain how she arrived at her conclusions.

*September 27, 2012*

**physics**

You pull a 18 kg sled across the floor with a strap that is at an angle of 40° above the horizontal with a force 86 N. Find the magnitude of the acceleration of the sled, given that the coefficient of kinetic friction between the sled and the floor is 0.23.

*September 22, 2012*

**Office administration**

Why are files reduce in an organisation?

*September 22, 2012*

**Physics**

A dolphin wants to swim directly back to its home bay, which is 0.85 km due west. It can swim at a speed of 4.30 m/s relative to the water, but a uniform water current flows with speed 2.83 m/s in the southeast direction. (a) What direction should the dolphin head? (b) How ...

*September 13, 2012*

**physics**

Sheena can row a boat at 2.90 mi/h in still water. She needs to cross a river that is 1.22 mi wide with a current flowing at 1.55 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. (a) What is her speed with ...

*September 13, 2012*

**Calculus**

limit as x-->4- (from the left) of (3[[x]]-5) [[absolute value.]]

*September 10, 2012*

**Calculus**

find the limit(if it exists), if not explain why. lim x--> 4- (3[[x]]-5)

*September 10, 2012*

**world geography**

Where on Earth? which of the 12 northern eurasian cities will be the home of your company's newest restaurant? hint: use information from an atlas and al almanac to eliminate all but one city

*September 7, 2012*

**vocab**

What is a compound sentence for abnegation?

*September 3, 2012*

**World Geogrpahy**

what does the cartogram tell you about japan?

*August 31, 2012*

**Physics**

A school bus takes 0.92 h to reach the school from your house. If the average velocity of the bus is 18.3 km/h to the east, what is the displacement?

*August 28, 2012*

**algebra**

Solve. (x-4)=18

*August 24, 2012*

**algebra**

Solve by using the square root property. (x+7)^2=-11

*August 24, 2012*

**Algebra 1**

what are the length and width of a rectangle if the area is 13.5 square units and the length of one side is .5 the measure of the perimeter?

*August 22, 2012*

**Math**

I posted this question before but accidentally typed in the wrong values! Please help, I just need to know the basic formula my book didn't provide any examples. For the function y = -2sin(x-(pi/3)) between x = 0 and x = 2pi : (6 marks) For what value(s) of x does y have ...

*August 14, 2012*

**algebra**

A motel clerk counts his $1 and $10 bills at the end of the day. He finds that hes has total of 64 bills having combined monetary value of $217. Find the number of each denomination that he has.

*August 14, 2012*

**algebra**

It would cost $79.59 to buy three tickets in Japan plus two tickets in Switzerland. Three tickets in Switzerland plus two tickets in Japan would cost $75.31. How much does an average movie ticket cost in each of these countries?

*August 13, 2012*

**algebra**

A store mixes Brazilian coffee worth $11 per kilogram and Venezuelan coffee worth $15 per kilogram. The mixture is to sell for $14 per kilogram. Find how much of each is needed to to make a 216-kilogram mixture. Brazilian coffee needed- Venezuelan coffee needed-

*August 13, 2012*

**algebra**

Solve by using the elimination method. 9x-y=72 x+4y=45

*August 13, 2012*

**algebra**

Solve by using the elimination method. 7x-8y=-20 8x+7y=74

*August 13, 2012*

**algebra**

Solve by using the elimination method. 2x=2+4y -3/2x+y=-31/2

*August 13, 2012*

**algebra**

What are the coordinates for each equation. 3x-2y=-18 -3x-y=0

*August 13, 2012*

**algebra**

Solve by the substitution method. 2x+7y=16 x=22-7y

*August 13, 2012*

**algebra**

Solve the system of equations by graphing. -3x-2y=18 3x-y=0

*August 12, 2012*

**algebra**

Solve by the elimination method. 2x-7y=-36 7x+2y=33

*August 12, 2012*

**trig**

Construct the equations of the following trigonometric functions: A)A sine function with amplitude 2, period , phase shift /3 right B)A tangent function with a reflection in the y-axis, period ¾, translation up 5 units C)A cosine function with period 270°, ...

*August 12, 2012*

**trig**

For the function -2sin(x-(pi/3)) between x = 0 and x = 2 : (6 marks) For what value(s) of x does y have its maximum value? For what value(s) of x does y have its minimum value? For what value(s) of x does y=1?

*August 12, 2012*

**Math**

What is the maximum number of nonoverlapping squares with sides of length 3 that will fit inside of a square with sides of length 6?

*August 10, 2012*

**algebra**

parking in a student lot cost $1 for the first half hour and $1.75 for each hour thereafter. A partial hour is charged the same as a full hour. What is the longest time that a student can park in this lot for $9 what is the answer

*July 28, 2012*

**algebra**

Complete the factoring. 3x^3+9x^2+6x

*July 25, 2012*

**algebra**

Calculate. 7[6+(8)^3]

*July 25, 2012*

**algebra**

Factor by grouping. 7z^2+21z-az-3a

*July 25, 2012*

**algebra**

Factor by grouping. 20s^3+65s^2-60s

*July 24, 2012*

**algebra**

Factor the trinomial. 5c^c-70c+200

*July 24, 2012*

**algebra**

Factor. 125r^2-245

*July 24, 2012*

**CJS/230**

Why don't you do your own homework without using someone else to do it for you?

*July 23, 2012*

**math**

6x+4(70-x)=300

*June 24, 2012*

**algebra**

6x+4(70-x)=300

*June 24, 2012*

**Physics question**

1.) If the curling stone was initially sliding at 2.97 m/s and stopped precisely 10.8 meters from its launch point, then the coefficient of friction (the ratio between the magnitude of the frictional force and the magnitude of the normal force) was? 3.) Two curling contestants...

*June 21, 2012*

**physics**

Forces of 86 N east, 23 N north, 46 N south, 55 N west are simultaneously applied to a box of mass 13.8 kg. Find the magnitude of the box's acceleration?

*June 18, 2012*

**Physics :)**

John and Joan walk in opposite directions around a circular path, starting from the same point. The path has a radius of 50.0 meters. John walks at 1.00 m/s, Joan at 1.25 m/s. How long will it take for them to meet? Can someone please explain this to me?! I keep getting it ...

*June 8, 2012*

**Physics PLEASE HELP**

Nitrogen gas molecules, which have mass 4.65×10−26 kg, are striking a vertical container wall at a horizontal velocity of positive 440 m/s. 5.00×1021 molecules strike the wall each second. Assume the collisions are perfectly elastic, so each particle rebounds...

*June 3, 2012*

**PHYSICS!!!**

A net force of 30 N is applied to a 10 kg object, which starts at rest. What is the magnitude of its momentum after 3.0 seconds? Can someone please explain this as you go through the steps? I already know the equation is p=mv and I know that mass is 10kg and I just need v...

*June 2, 2012*

**Calculus**

Find the volume or the solid generated by revolving around the region bounded by the graphs of the equations about line x=6. xy=6, y=2, y=6, and x=6

*May 28, 2012*

**math (please double check my answers)**

4. Prove: 2^n + 2^n = 2^n+1

*May 27, 2012*

**math**

6. Determine the domain and range for each function given. Explain where any restrictions come from. a. f(x)= sqrt x + 5 – 4 b. f(x) = 1/2x^2 – 32 c. f(x) = 4/x^2 + 1

*May 24, 2012*

**College Algebra**

Solve the equation. If necessary, round to the nearest thousandth. 5(2x-1)=10

*April 20, 2012*

**physics**

Suppose the spring in this spring-powered rifle has a spring constant of k = 1,000 N/m. How much work can it do in accelerating the projectile, if it is compressed by x = 0.10 m?

*March 16, 2012*

**science**

Overpopulation. Increase population=decrease of natural resources.

*March 15, 2012*

**Chemistry**

I know that I am close to the answer using this formula with plugged in information: ln p2/760= 40500/8.314(1/273-1/351.1) Just not sure what I am doing wrong. Is someone could assist me that would be greatly appreciated! thanks :)

*March 15, 2012*

**Chemistry**

The boiling point of ethanol is 78.5C and delta H vap = 40.5kJ/mol. Calculate the vapor pressure (in torr) of ethanol at 0.0C ?

*March 15, 2012*

**algebra**

Write an exponential function to model the situation. Then predict the value of the function after 5 years (to the nearest whole number). A population of 210 animals that increases at an annual rae of 19% Can you explain your answer please?

*March 15, 2012*

**math**

b.) 8P3 = 336

*March 8, 2012*

**Algebra II**

If F(x)=x^2-x+1 and g(x)=-3x+6, what is the product of f(-1) and g(3)? Help please.

*March 2, 2012*

**Chidren,Families,and Society**

I believe the answer is D

*February 20, 2012*

**math**

how do you find the derivative of f(x)=2x/(x^2+x+1)^1/2 HELP A.S.A.P.?

*February 17, 2012*

**Algebra 2**

(x-4)^3/2 = -6 In the end I got .69, but that's wrong. Please help. I don't really understand. My work. x-4 = -6^2/3 x=4-6^2/3 x=.6980727511

*February 13, 2012*

**Physics**

A stuntman sitting on a tree limb wishes to drop vertically onto a horse galloping under the tree. The constant speed of the horse is 10.0 m/s, and the man is initially 2.75 m above the level of the saddle. (a) What must be the horizontal distance between the saddle and limb ...

*February 7, 2012*

**math**

The final math grades for all 6th graders were A: 125, B: 200, C: 350, D: 95, and F: 25. Make a bar graph to display this data. In the box below, write a description of your bar graph.

*February 2, 2012*

**science**

False

*January 26, 2012*

**Algebra 2**

Solve each equation by graphing. Where necessary, round to the nearest hundredth -x^3+2x^2+1=0

*January 25, 2012*

**Algebra 2**

Solve each equation by graphing. Where necessary, round to the nearest hundredth x^4+2x-3= 0

*January 25, 2012*

**Algebra 2**

Solve each equation by graphing. Where necessary, round to the nearest hundredth -x^3+3x+4=0

*January 25, 2012*

**chemistry**

CxHyCz compound weighs 132 amu, what is the molecular formula?

*January 23, 2012*

**greek philosophy and history**

Greek philosophers

*January 21, 2012*

**Algebra**

Thank you. :)

*January 11, 2012*

**Algebra**

So would it be (x-1)(x+1)?

*January 11, 2012*

**Algebra**

Factor x^2-1=0 How do you factor when there is no B in this equation?

*January 11, 2012*

**Algebra**

It says to complete the square for x^2-4x-2=0 How do you do this? Please help.

*January 11, 2012*

**english**

what is the correct way to write, (A characteristic I dislike is someone who is weak).

*December 6, 2011*

**physics**

A 2 kg ball is dropped from a height of 433 mm. Calculate the height (above the ground) at which KE is one third of PE.

*December 3, 2011*

**Biology**

In order to predict the percentage of males and females three assumptions must be considered: 1. The X carrying sperm and Y carrying sperm have an equal chance of fetilization: 2. The egg and sperm combine at random: 3. the XX and XY zygotes have equal chance of development at...

*November 24, 2011*

**chemistry**

Reaction with the presence of sunlight would be: CH4 + Br2 --> CH3Br + HBr

*November 22, 2011*

**Math**

Sam drives his car 23,040 miles per year. Find this rate in the number of miles driven per month, to the nearest mile

*November 10, 2011*

**Calculus**

Suppose f(pi/3) = 3 and f '(pi/3) = −7, and let g(x) = f(x) sin x and h(x) = (cos x)/f(x). Find the following. a. g'(pi/3) b. h'(pi/3)

*November 7, 2011*

**calculus**

How do I rond three decimal places?

*November 7, 2011*

**Algebra**

Use slopes and intercepts to determine if the following system is consistent, inconsistent, or dependent. -4x - 5y = 20 -12x - 30y = 60

*November 3, 2011*

**Algebra**

x/4 - y/2 = -11/4 x/4 + y/2 = 1/4 solve the system

*November 3, 2011*

**Calculus**

The number N of US cellular phone subscribers (in millions) is shown in the table. (Midyear estimates are given.) t 1996 1998 2000 2002 2004 2006 N 44 69 109 141 182 233 (a) Find the average rate of cell phone growth between the following years. In each case, include the units...

*October 29, 2011*

**Math**

An employee has two hourly wage options for positions in a large corporation. One position pays $11.00 plus additional unit rate of $0.50 unit produced. The other pays $7.25 plus a unit rate of $1.25. W(x)=11+0.5x M(x)=7.25+1.25x I need to find the solution for the systems by ...

*October 22, 2011*

**Physics 3**

Since F = -(dU/dx)i -(dU/dx)j -(dU/dx) = - (9x^2y - 7)i -(dU/dy) = - (3x^3) F = -(dU/dx)i -(dU/dy)j = (-9x^2y+7)i - 3x^3j

*October 20, 2011*

**math**

my equation is m 2=c. I want to use my equation to find the cost of a 60-mile trip.

*October 17, 2011*

**history 101**

why did the development of civilization in the americas and sub saharan africa differ so dramatically from development in Eurasia? why did certain Eurasia civilizations thrive while others collapsed during the first millenium B.C.E.

*October 16, 2011*

**Algebra**

Would this be B? 3(-1) - 2(-2) = 1 (-3) - (-4) =1 1 = 1

*October 13, 2011*