# Posts by christina

Total # Posts: 931

biology
if a rock had a mass of 9.00g, what is the density of the rock?

calculus
Find the limit. Use l'Hospital's Rule if appropriate. If there is a more elementary method, consider using it. lim x?? {(5x ? 4)/(5x + 3)}^5x + 1

calculus
Find the limit. Use l'Hospital's Rule if appropriate. If there is a more elementary method, consider using it. lim x?0 (e^x ? e^?x ? 2x)/(x ? sin(x))

calculus
Find dy/dx by implicit differentiation. arctan(2x^2y)=x+4xy^2

calculus
Find y'and y''. y=x^1/2 ln(x)

Math
what is 4+9 to the second power divided by 3x2-2

Math
use the digits 6 7 8 and 9 to make a problem with the largest product possible

Math
A sweater costs 15.99. If the sweater is on sale for 1/4 off its price, about how much would you save?

math bus 105
Calculate (a) interest and maturity value, (b) discount period, (c) bank discount, and (d) proceeds. Assume ordinary interest. (Round answers to nearest hundredths) Date of note Face value Length of note Interest rate Bank discount rate Date of discount Feb. 12 \$80,000 150 ...

Chemistry
After mixing 1 g of 60% ee (+)-Kendomycin with 2 g of 80% ee (+)-Kendomycin, what is the ee of the final mixture? I know the answer is 73% ee, but I don't understand how to get to that answer!

chemistry
A compound contains 74,27%C;7,79%H;12,99%N. Determine the empirical formula. C=12;H=1;N=14;0=16.

chemistry
Calculate the percentage composition of sulphuric acid if the atomic masses are H=1u, S=32u and 0=16u

maths /science
A body calling from rest has a velocity of 25m/s at given instant. Calculate 1 the distance the body has fallen 2 the time taken

maths/science
A body falls from a position of rest at the top of a tall building and attains a velocity of 63.7m/s just before striking the ground. Calculate the time for the body to fall from the top of the building to the ground

maths
Calculate the velocity of a stone7 seconds after falling from rest of the edge of a high cliff

Clc
5 more than the product of -2 and the number

Math
Alice can complete a certain job in 5 hours she had been working on the job for two hours when a friend came along. And helped her finish together they completed the job in 1 hr how long would it take alices friend to complete a job on her own. I have 1 fifth plus 1 over1 ...

Math help
Use what's called the percent change formula: % Change=New amount-old amount/old amount and multiply the answer by 100 to get it in terms of percentage. For example: 14-9=5 5/14 (14 because that was its initial price prior to it decreasing) =0.3571. We want our answer in ...

Life Orientation
Restorative justice is a new concept in the south african legal landscape. Explain briefly what its intentions are in the process of human rights violations

lifeorientation
Xenophobia

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

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

Art
No name is 100% right! I took the test and got 100%! Thank you no name!

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 ...

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

Geometry
1. D. BOA 2. B. Right (I think) 3. A. 105 4. B. Sometimes Sorry I didn't answer sooner I just found this question.

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

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...

Calculus- NEED HELP!!!

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 ...

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

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

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...

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 ...

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

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 ...

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

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 don't exothermic reactions give off heat? If someone could clear this up, I would really ...

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

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

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

la history

la history

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 ...

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

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)

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?

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

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?

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

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

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.

Science
What do B cells do?

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

Biology
OMG I did this one before!

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...

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 ...

Math
Ms. Sue you may be a math teacher but wording is important here. The correct answer should be 30%. It didn't say what percentage of total students chose walking, it said what percentage of boys chose walking. There are 10 boys, 3 of whom chose walking. Therefore, the ...

Math
Wow Ms.Sue who ever you are I keep seeing you on this website.

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.

English
What is the difference between the denotative and connotative meaning of a word?

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

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

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

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 ...

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 ...

geography
What are examples of human adaptation to the environment?

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

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

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?

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?

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?

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 ...

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?

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

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

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

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...

Accounting
34000

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)

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

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 ...

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 ...

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?

Tourism
I don't know which career i must do with the subjects i chose

Geography
1. Is all of the above

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?

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 ...

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 ...

Science
Inductive reasoning is right(: A+

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 ...

physics
speed=30km/h time=0.5hrs distance=s*t =15km speed=25km/h time=1hrs distance=s*t =25km speed=40km/h time=2hrs distance=s*t =80km average speed= total distance/total time taken = (15+25+80)/(1+2+0.5) = 120/3.5 = 34.28km/h.

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?

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

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!

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..

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?

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!

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 ...

1. Pages:
2. 1
3. 2
4. 3
5. 4
6. 5
7. 6
8. 7
9. 8
10. 9
11. 10
12. Next>>