Friday
April 29, 2016

# Posts by Christina

Total # Posts: 903

lifeorientation
Xenophobia
April 13, 2016

life orientation
Education -you have the right to basic education example work hard, attend school regularly
April 12, 2016

physics
Can the value of equilibrant be equal to zero? If yes, why?
April 4, 2016

chemistry
Suppose that the microwave radiation has a wavelength of 12 cm . How many photons are required to heat 255 mL of coffee from 25.0 ∘C to 62.0 ∘C? Assume that the coffee has the same density, 0.997 g/mL , and specific heat capacity, 4.184 J/(g⋅K) , as water ...
March 14, 2016

Math
C 9P4 = C There are 9 slots, in which 4 parts can be placed in. Order also matters for each part/role. Therefore, 9P4
March 6, 2016

stats
Out of 16 actors, there are 10 female roles. Out of 9 actors, there are 5 male roles. Therefore, 16P10 * 9P5 = Answer
February 10, 2016

Calculus- Damon, Steve, Reiny
I forgot to mention that I am trying to find sigma squared.. given that the mean is r and p(x)= (1/r)(e^(-x/r)) on the interval [0,infinity), where r>0.. note: sigma squared= integral sign (-inf, inf) (x-M)^2 p(x) dx i got (r^2 - 2r)^(1/2) for sigma, but my answer is wrong...
November 28, 2015

Calculus- NEED HELP!!!
November 28, 2015

Calculus
I tried to integrate this: intergral sign with an interval from -inifinity to + infinity function: (x-r)^2 (1/r) (e^(-x/r)) with respect to dx..... I know that Steve set up the u-substitution but I seem to never arrive at an answer... It seems like I keep integrating and ...
November 28, 2015

Calculus
How do you integrate (x-r)^2 (1/r) (e^(-x/r)) from the interval negative infinity to positive infinity?
November 27, 2015

maths
a bag contains three labelled A,R,C and a box contains 4 cards 1,2,3,5. if cards are picked from the bag and from the box, find the probability of picking on A and a prime number
November 25, 2015

Calculus
Calculate μ and σ, where σ is the standard deviation, defined by the following. σ^2 = integral between (−∞,∞) (x-μ)^2 p(x) dx The smaller the value of σ the more tightly clustered are the values of the random variable X about the...
November 22, 2015

Chemistry
Why does carbonate have a -2 charge and not -1? Why does phosphate have a -3 charge and not -2 or -1? Why does nitrate have a -1 charge and not -2 or -3? My answer: Based on the Lewis structure, these ions need a certain number of electrons in order to be stable...the octet ...
November 22, 2015

Chemistry
Rank the following in order of increasing bond polarity: H-F, H-Br, F-F, Na-Cl. Is it this....? F-F, H-Br, H-F, Na-Cl
November 22, 2015

Chemistry
Why does carbonate have a -2 charge and not -1? Why does phosphate have a -3 charge and not -2 or -1? Why does nitrate have a -1 charge and not -2 or -3? My answer: Based on the Lewis structure, these ions need a certain number of electrons in order to be stable...the octet ...
November 22, 2015

math
how much flour will be needed to make 3 pies if using 1 3/4 cups of flour? i need two ways of solving this question please
November 17, 2015

Chemistry
My final temperature was higher than my initial temperature, and my graph shows that the temperature icreases and then decreases. I thought that would make it exothermic, but dont exothermic reactions give off heat? If someone could clear this up, I would really appreciate it...
October 18, 2015

Chemistry
How can I tell from a graph of temperature vs. time if a reaction is endothermic or exothermic?
October 18, 2015

How do adaptations enable organisms to reduce competion for food and other resources PLEASE ANSWER BY 4 (50 MINS)
October 18, 2015

Algebra
Find the linear function with the following properties: f(0)=1 and the slope of f equals -3/2 THANK YOU
October 10, 2015

Algebra
The back of Tom's property is a creek. Tom would like to enclose a rectangular area, using the creek as one side and fencing for the other three sides, to create a corral. If there is 100 feet of fencing available, what is the maximum possible area of the corral? ? square ...
October 5, 2015

Math 71x
One cell phone plan allows 200 text messages per month for \$20 after which text messages cost \$0.04 each. Another cell plan allows 400 text essages per month for \$30 each. What would be the minimum text messages that would justify the more expensive plan
October 1, 2015

Stats
estimate the probability that a patient has health insurance, if 59% of Americans have private insurance and 25% have government insurance. Estimate the probability that it is private insurance Is this P(A and B) = P(A) x P(B)
September 27, 2015

Math
Bob was riding his dune buggy. Part of the time he was riding at 10 mph and the remainder of the time at 14 mph. The total distance traveled was 68 miles and it took him 5 hours. How much time was spent traveling at 10 mph?
September 27, 2015

Physical Science
how much energy must be removed from 1 L of water at 25 C and turn it to ice at -10 C?
September 23, 2015

Chemistry
When 24.0 cal of heat is added to 18.5 g of aluminum at 19.0 ∘C, what is the final temperature of the aluminum?
September 14, 2015

science
a baby pushes a toy across the floor with a force of 5 newtons inertia balanced force unbalanced force velocity
July 13, 2015

Statistics
A random sample of 100 cable TV movies contained an average of 3.38 acts of physical violence per program. At the 99% level what is your estimate of the population value? mean = 3.38 s = 0.30 N = 100
June 14, 2015

Bio
Why do doctors recommend that people get a flu shot each new flu season? The vaccine wears out over time. The body eliminates the vaccine. The flu virus changes every year. The flu virus becomes immune to the vaccine.
June 4, 2015

Science
What do B cells do?
June 4, 2015

Science
n(No/N) = kt No = 100 N = 85 t = 5 days solve for k Then ln(No/N) = kt No = 100 N = ? solve for this amount remaining. k = from above t = 25 days N is what is left. (N/100)*100 = % left
June 4, 2015

Biology
OMG I did this one before!
May 27, 2015

programming
Using python write a program that does the following: •Create the logic for a program whose main() method prompts a user for 1000 numbers and stores them in a list. •Pass the array to a method that reverses the order of the numbers. •In the main program, display...
April 17, 2015

Programming logic and design
Using python write a program that does the following: •Create the logic for a program that calculates and displays the amount of money you would have if you invested \$3000 at 2.65 percent interest for one year. •Create a separate method to do the calculation and ...
April 17, 2015

physics
dahnay carried a box (5,4)m.the box had a mass of 5kg.dahnay says that over 300J of work was done on the box . is dahnay correct?explain the answer.
March 16, 2015

English
What is the difference between the denotative and connotative meaning of a word?
February 2, 2015

Ss help 8th
Compare and contrast the experiences of the Creeks and Cherokees in Georgia following the War of 1812
January 31, 2015

SS ANYONE HELP?
you know any links i can find my answers? anything. i need help on this.
January 31, 2015

SS ANYONE HELP?
Describe significant events in the social and economic reconstruction of the South. Why are these events significant?
January 31, 2015

How is this so far? and what else should i add, i need two pages and i have only one done, due today. help? I'm doing like a journalist. I Josephine A. Walker was a slave for Harry Richardson. Every morning I had to serve him, I had to be up by 4am and was unable to go to ...
January 29, 2015

SS
How is this so far? and what else should i add, i need two pages and i have only one done, due today. help? I Josephine A. Walker was a slave for Harry Richardson. Every morning I had to serve him, I had to be up by 4am and was unable to go to bed till 12am midnight. I had to ...
January 29, 2015

geography
What are examples of human adaptation to the environment?
January 22, 2015

Geography
What role did the waterways of Europe play in the development of it's economy?
January 21, 2015

Geography
How are the landforms of Europe both an advantages and a disadvantage to life in Europe?
January 21, 2015

Physics
You are going diving in a pool of fresh water. Your body can only take a total pressure on it of 2.0 atmospheres. How deep can you dive before your body can no longer take the pressure?
January 2, 2015

physics
A toy boat has a volume of 0.0005m^3. It has a mass of 450 grams. How much of the boat is under fresh water?
January 2, 2015

Physics
A hot air balloon of radius 12 meters has been heated so that the air inside has a density of 1.05 kg/m^3. What can the total load of the balloon be (mass of balloon itself plus cargo) if you need the balloon to accelerate into the air with an acceleration of 4 m/s^2?
January 2, 2015

algebra
You deposit \$3000 in an account earning 7% interest compounded continuously. The amount of money in the account after years is given by A(t)=3000 e^(0.07 t) . How much will you have in the account in 5 years? \$ Round your answer to 2 decimal places. How long will it be until ...
November 22, 2014

science
A swimming pool measures 10m by 7m by 2m calculate the full force exerted by the water against the bottom. What is the pressure at the bottom due to the water?
November 21, 2014

Accounting
computer equipment beginning balance is 20,000 working on the adjusted general journal and the scenario is the computer has a 4 year life with no salvage value not sure how to log this
November 15, 2014

science
Bill kicks a rock off the top of his apt building it strikes a window across the street 18m away the acceleration of gravity is 9.8m/s if the window is 25m below the position where bill contacted the rock how long was it ini the air
November 13, 2014

Chemistry 11
Thank you guys so much for helping me! I see my steps were really unnecessary.
November 12, 2014

Chemistry 11
Find the percent composition of a compound containing sodium and chlorine if 24.34g of the compound contains 13.45g of sodium. My work: Molar mass of NaCl: MNa +MCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol Percent composition of Na: 22.99 g/mol / 58.44 g/mol x 100 = 39.34% Na...
November 12, 2014

science-gen chem
if 0.969 g of CaCl2 is mixed with 1.111 g of KlO3 how many grams of solid Ca(IO3)2 can theoretically be made? CaCl2(aq) + 2KlO3(aq) ===> 2Kcl(aq) + Ca(lO3)2 (s)
October 27, 2014

Language Arts
In "The Finish of Patsy Barnes," why does Patsy want to race on Black Boy? (1 point) Patsy feels Black Boy owes him a win.** Black Boy is the best horse. Patsy wants to please Brackett. Patsy wants to prove he is a man. 2. What final events in "The Finish of ...
October 1, 2014

math
If the sun is aplroximantely 1.5×10^(11) meters from Earth, what is the approximate distance from Earth to Mars.
September 22, 2014

College Chemistry
Suppose there are two known compounds containing the generic elements X and Y. You have a 1.00-g sample of each compound. One sample contains 0.29 g of X and the other contains 0.38 g of X. Identify plausible sets of formulas for these two compounds. Check all that apply. XY ...
September 3, 2014

Math
The Mills Lunch Shop prepares fresh take-out entrees each day. On Tuesday, 40 baked chicken dinners were prepared at a cost of \$3.20 each. A 20% spoilage rate is anticipated. Mills Lunch Shop sells the dinners at an 80% markup based on cost. They decided to offer a \$1.00-off ...
August 31, 2014

Geography
Which geographic feature marks the last natural obstacle for Georgia’s rivers on their way to the Atlantic Ocean? (1 point) the Floridian Aquifer the Valley and Ridge region the Fall Line *** (MY ANSWER) the Marshes of Glynn AM I RIGHT?
August 28, 2014

Tourism
I don't know which career i must do with the subjects i chose
August 25, 2014

Geography
1. Is all of the above
August 25, 2014

Geography
1.Encouraging crops with longer growing seasons 2.both the first and third answer choices 3.the Fall Line 4.aquifer Am i right Ms. Sue?
August 25, 2014

Geography
Which of the following are impacts that the temperate climate has had on Georgia’s development? (1 point) encouraging crops with longer growing seasons drawing immigrants from other locations encouraging tourism all of the above 3. What impacts have precipitation and ...
August 25, 2014

Geography
Which of the following most accurately describes the difference between climate and weather? (1 point) Climate refers to long-terms conditions; weather refers to daily conditions. Climate refers to severe weather events; weather refers to precipitation. Climate refers to land ...
August 25, 2014

Science
Inductive reasoning is right(: A+
August 15, 2014

Science
In the early 1900s, Alfred Wegener noticed that some of the Earth's continents looked like they might fit together like a jigsaw puzzle. He also observed that the continents that looked like they fit together had similar plants, animals, and rock formations. From this ...
August 15, 2014

physics
Two mirrors are placed at a 90° angle to each other. A light ray strikes one mirror 0.730 m from the intersection of the mirrors with an incident angle of 36.5°. The ray then travels a distance d before reflecting from the second mirror. (a) What is the distance d?
May 12, 2014

general science
if an object is thrown 60 m into the air and it takes the object 6 s to get there, what's the average speed of the object? (A) 20m/s (B) 360 m/s (C) 100 m/s (D) 10 m/s
May 5, 2014

Chemistry
Write the class/family of the following compounds and the functional group in each compound. a. 3-methylcyclohexene b. Cis-3-octene c. 4-methyl-2-heptanone d. 3-bromobenzaldehyde e. 3-bromo-5-chlorotoluene f. 3-chlorophenol g. 6-methyl-2-heptyne Please help!
April 22, 2014

Stats
Find the P-value for a left tailed hypothesis test with a test statistic of z= -1.77. Decide wether to reject the null if the level of significance is alpha= 0.05. Please help I've tried everything and I can't figure out how to get the right answer..
April 17, 2014

Hanus
points Q (10,8) and R (24,10) are the endpoints of a diameter of a circle centered at P. Line l is tangent to the circle at S (12,14). What is the y-intercept of line l?
April 11, 2014

Statistics
In a survey of 621 males ages 18-64 , 396 say they have gone to the dentist in the past year. Construct 90% and 95% confidence intervals for the proportion. Interpret the results and compare the widths of the confidence intervals. Please show step by step. Thank you!
April 7, 2014

Physics
You are given a four-wheeled cart of mass 11 kg, where the distance between a wheel and its nearest neighbors is 2.1 m. Suppose we load this cart with a crate of mass 109 kg, where the crate's center of mass is located in the back-middle of the cart, 0.525 m from its ...
April 6, 2014

Physics
Suppose we take a 1 m long uniform bar and support it at the 27 cm mark. Hanging a 0.31 kg mass on the short end of the beam results in the system being in balance. Find the mass of the beam.
March 28, 2014

Spanish2
Está prohibido fumar. (Write advertisements or signs for the situations described. Use impersonal constructions with se.)
March 17, 2014

Physics
PE=.5kx^2
March 13, 2014

pre-calculus
Find the real and imaginary zeros for the following polynomial function. T(b)= 147b^3-35b^2-19b+3
March 6, 2014

RE: Physics
If an incline has a difference in height from one end to the other of 17.8 cm and has a length along the incline of 1.19 m, what is the angle that the incline makes with the horizontal reference surface? Physics - Damon, Saturday, February 15, 2014 at 5:20pm cos (angle) = .178...
February 15, 2014

Physics
So the answer is 81.4? My online homework says that it is wrong?
February 15, 2014

Physics
If an incline has a difference in height from one end to the other of 17.8 cm and has a length along the incline of 1.19 m, what is the angle that the incline makes with the horizontal reference surface?
February 15, 2014

Chem
what mass of hydrogen was in an unknown compound containing only c, h, and o if 2.65kg H2O was produced by combustion analysis
February 12, 2014

US History
gogle it it comes up on yaho answers. I would probably go with A too.
February 11, 2014

US History
The train I believe.
February 11, 2014

physics
In the circuit shown, find the voltage Vx (in Volts) if V = 17.0 Volts, R1 = 13.0 k ohms, R2 = 4.0 k ohms, R3 = 13.0 k ohms and R4 = 21.0 k ohms. Answer is -6.5 I don't understand how they got it, can someone please explain it with steps? Thanks tinypic. c o m/r/2pzhcpl/8
February 11, 2014

Physics
In the circuit shown, find the voltage Vx (in Volts) if V = 17.0 Volts, R1 = 13.0 k ohms, R2 = 4.0 k ohms, R3 = 13.0 k ohms and R4 = 21.0 k ohms. Answer is -6.5 I don't understand how they got it, can someone please explain it with steps? Thanks tinypic. c o m/r/2pzhcpl/8
February 11, 2014

Physics
If the resistances R1= 16. ohms, R2 = 38. ohms, and R3 = 18. ohms, and the voltage V = 6.0 volts, what is the current ix (in Amperes) in the circuit. tinypic .cm /r / nfr48k/ 8 The correct answer is .1443 but I want to know how they got that. Thanks.
February 10, 2014

Math
fgguhutgt6fgkhr
February 3, 2014

science
You measure the dimensions of a rectangular block of aluminum to determine its volume. It has the following dimensions. length = 10.27 cm; width = 4.92 cm; height = 1.53 cm Assuming that each of these measurements is accurate to the nearest 0.01 cm, find the volume of the ...
February 3, 2014

Science
The sensitivity of a measuring instrument is the value of the smallest quantity that can be read or estimated with it. What is the smallest part of a centimeter that can be read with the following? (a) a meterstick with markings at each millimeter I tried .01 mm .05 mm .1 mm ....
February 3, 2014

Physics
A test rocket is launched by accelerating it along a 200.0-m incline at 1.25m/s2 starting from rest at point A (the figure (Figure 1) .) The incline rises at 35.0 ∘ above the horizontal, and at the instant the rocket leaves it, its engines turn off and it is subject only...
February 2, 2014

Physics
A test rocket is launched by accelerating it along a 200.0-m incline at 1.25m/s2 starting from rest at point A (the figure (Figure 1) .) The incline rises at 35.0 ∘ above the horizontal, and at the instant the rocket leaves it, its engines turn off and it is subject only...
February 1, 2014

Calculus
Consider the solid obtained by rotating the region bounded by the following curves about the line x=1. y=x,y=0,x=4,x=6 Find the volume So it would be pi (integral from 3 to 6) of ((1-y)^2 -(1-0)^2) right? so then you integrate it and get pi(Y^3/3-y^2) from 3 to 6. ?
January 29, 2014

Physics
A 0.5 kg wooden block is dropped from a height of 15 m. At what height must a 5g bullet be traveling upward strike the block in order to momentarily stop its fall? Assume that the time required for the bullet to come to rest in the block in negligibly short, that no internal ...
January 22, 2014

Physics
An explorer in the dense jungles of equatorial Africa leaves his hut. He takes 41 steps at an angle 45∘ north of east, then 81 steps at an angle 60∘ north of west, then 49 steps due south. Assume his steps all have equal length. Save him from becoming hopelessly ...
January 19, 2014

science/math
A car traveling at the speed of 30.0 m/sec encounters an emergency and comes to a complete stop. how much time will it take for the car to stop if its rate of deceleration is -4.0 m/sec
January 16, 2014

social studies
What was the reason for Baltimore's successful shipyards?
January 13, 2014

Social Studies
1. Diversity most closely means (1 point) sharing cultural traits and practices with others. making up a whole of many different parts. being a member of a small ethnic group. having many similar regions next to one another. 2. How does life in Istanbul differ from life in ...
December 10, 2013

Calculus
The area A of the region S that lies under the graph of the continuous function is the limit of the sum of the areas of approximating rectangles. A = lim n → ∞ [f(x1)Δx + f(x2)Δx + . . . + f(xn)Δx] Use this definition to find an expression for the ...
November 24, 2013

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