# Posts by Christina

Total # Posts: 930

Math- Algebra II
thank you, okay I wasn't' sure

Math- Algebra II
Simplify (7-3i)^2. So would I do this: (7-3i) (7-3i) then distribute it .... OR (7-3i)^2 square everything 49+9i^2 ? thanks

math
the study hours are 4, 10, 20, 24, 34, 36, 42 and the z scores are 2.5, negative 1.75, negative .5, 0, 1.25, 1.5, 2.25 and the percentile ranks are 10,25,35,40,50,75,95 what is the study hour with a z score of 1.75, what is the standard deviation of all the students, and what ...

Statistics
In a survey of 1037 adults from the United States age 65 and over, 643 were concerned about getting the flu. Construct a 90% confidence interval for the population proportion.

Finite Math
I keep trying to set up this problem to solve it using the Simplex Method, but I can't seem to get the tableau set up correctly. If anyone could help, I would appreciate it: A baker has 150 units of flour, 90 of sugar, and 150 of raisins. A loaf of raisin bread requires 1 ...

Algebra
Solve by elimination method. 7r-3s=14 3r+7s=64 Could never figure out the elimination method. Would love some help with this one. Thanks

Precalculus
I've tried many times to get the equation to balance using trig identities like half-angle formulas, power-reducing formulas, and double angle formulas, but I couldn't get the equation to equal out. I only need to work one side to make it equal to the other, like a ...

Precalculus
How do I solve this? 1 - 4sin^2(x)cos^2(x) = cos^2(2x)

Consider: 4 children - .5 x 4 = \$2 1 man - 1 x 2 = \$2 32 women - 32 x 3 = \$96 total = \$100

Algebra
Solve: -10<=4x-5<--4

physics

physics
A gas is taken though a single process in which its volume decreases by .25 m^3 as the temp of the gas rises 2deg C. Which of the following people are more likely to have reached the correct conclusion? a. Bob ids this process as adiabatic b. Jill ids this process as ...

physics
A spring that is .7m in length elongates to 1.06 m when a 20 newton force is exerted to stretch the spring. By how much more does the spring stretch when an additional 8 newtons of force is exerted on it?

physics
A 5 kg block of average density .625 kg/m^3 has a volume of about _____ cu. m

physics
An observer detects an apparent frequency of 505 hz coming from a 500 hz source. Which is true? a. the observer is moving due east, away from the stationary source b. the source is moving due west, away from the stationary observer c. the souce and the observer are moving away...

physics
A dinner plate drops and breaks. This best illustrates the ______ law of THERMODYNAMICS A. 1st b. 2nd c. 3rd d. 4th

chemistry
Salicyclic acid reacts with methanol to produce methylsalicyclate or winter green and water according to the following reaction: C7H6O3 (s) + CH3OH (l) --> C8H8O3 (s) + H2O (l) What mass methylsalicyclate can be produced from 15.00 grams of salcyclic acid? What mass of ...

chemistry
Calcium carbonate reacts with hydrochloric acid according to the following reaction: CaCO3 (s) + 2 HCl (aq) --> CaCl2 (aq) + H2O (l) + CO2 (g) How many grams of calcium carbonate would be required to neutralize 50.0 cm3 of 8.00 M HCl?

logarithmic differentiation
How do you find the logarithmic differentiation of y = x^6x?

logarithmic differentiation
How do you find the logarithmic differentiation of y = x-cos x ?

Physics
Thanks! :)

Physics
a 10 kg ball moving due west at 2m/sec collides with a 4kg ball that is moving due east at 3 m/sec. You determine that immediately after the collision the 10 kg ball is moving due west at 0.57 m/sec. A) this probably IS a Totally inelastic collision B) this definitely is NOT a...

Physics
A 10 kg ball moving due west at 2m/sec collides with a 4kg ball that is moving due east at 3 m/sec. You determine that immediately after the collision the 10 kg ball is moving due west at 0.57 m/sec. How do I set up the equations to find the answer?

Science
Where are memories stored in your brain?

math
when doing decimoles and multiplying them by whole numbers...for example 4.7805 multiplyed by 1000 dose the decimole go 4places over or 8places over i don't get it please help!!!

Physics
Thank you so so much And I also posted another physics question down below if you don't mind helping me out?

Physics
A weight of 50.0 N is hung from the center of a stretched horizontal wire 10.0 meters long. It causes the wire to say 1.00m at its center. What is the force exerted by each half of the wire in supporting the weight?

physics
an electric sign weighing 200 newtons is supported by two slanting cables. each cable is attached to the same point of the sign and makes a 45 degree angle with the horizontal. what is the component of the force exerted by the sign along each of its cables?

algebra
The answer should be 14. Substitute "6" for every "x" and solve.

Chemistry
5,2

Chemistry
Between which two orbits of the Bohr hydrogen atom must an electron fall to produce light of wavelength 434.2nm?

World History
From 8000Bc- 600 AD This is talking about the fall of Rome and greece.

World History
what classical traditions and institutions survived despite the fall of the states? Please I really need help, I have no notes on this.

spanish

World History
I don't know, mabye it's a typo. Just ignore that word.

World History
describe the spread of sedentary agriculture outside the older civilized areas

english
Notes, Feelings, Diary, Storys, Essays, Thoughts, Pictures.

World History
aryans is an old english language?? and guptas was an ancient Indian empire

World History
explain the beliefs of Hinduism and its evolution from the aryans to the Guptas. WHO ARE THE ARYANS AND THE GUPTAS? please help :(

math
1/33 percent of 600?

BIOLOGY
GOOOGLE. EASY question for google. com

MATH
divide all the points given by two then graph them and connect the points. (:

math
tyrell because you must round it up because it is over 749 it rounds up.

World History
what does it mean by institutions? How do I describe Legalism?

World History
Describe the teachings and institutions of Confucianism Dadaism and legalism

With different kind of maps

spanish

Repost-- ms. sue.
Thank you!!!!!!!! I love <3 this site.

Repost-- ms. sue.
how were the first civilizations similar and different? They all had a social hierarchy, and some sort of government. The main type of ecominic income was agriculture-i think-. That's all I know

physics
483000 in what units?

physics
That's wrong Muilitpy 3* 5280

physics
K cool. first step 3 miles * 5280 ft __________________ 1 ft 1 mile. Now muilitply top times top ( 3 times 5280) and then divide it by the answer at the bottom when u muiltply. (1 times 1)

physics
Okay first you have to go from miles to ft then to iniches and then to cen? right? So you put what your trying to find on top. I'm not going to do this for you so tell me, how many feet are in a mile?

Random?
to get different opinions.

MATH
One quarter is 1/4 or .25 so * .25 * 6= ? Then do the same thing you did for A and there you go (:

MATH
Make the ft into ins. (12 in. in a foot) and muilitpy length *width *height.

World History
Oh, okay. They all had a social hierarchy, and some sort of government. The main type of ecominic income was agriculture-i think-.

World History

World History
how were the first civilizations similar and different?

World History
8000 BC-600 CE I don't know

World History
How did civilized culture survive the rise and fall of regional states?

CHEM
3, because the 0 don't count, they would count if the number had a decimal point at the end, but it doesn't so 3.

algebra
3z^8 over 7p^3 multiplied 49p^5 over 9z

An Overview of Teaching Techniques
12.) is wrong CORECT ANSWER IS C.

An Overview of Teaching Techniques
12.) is wrong

Chemistry
A 2.52g sample of a compound containing only carbon, hydrogen, nitrogen, oxygen, and sulfur was burned in excess O to yield 4.36g of CO2 and 0.892g of H20. Another sample of the same compound of mass 4.14g, yielded g of SO3. A third sample, of mass, 5.66g, yielded 2.80 g of ...

economics
can anyone explain to me how to solve for P, if Q=240-2P?

economics
HELP!!!!! One and only Inc is a monopolist. The demand function for its product is estimated to be Q=60-0.4P +6Y+2A Y=3,000 P=Price per Unit Y=Per capita disposable personal income (thousands of dollars) A=hundreds of dollars of advertising expenses The Firms average variable ...

According to Bohr model, what determines the color of light emitted when an electron moved from one energy level to another?

statistics
Use the random-number table to simulate the outcomes of tossing a quarter 25 times. Assume that the quarter is balanced (i.e., fair). (Start at row 1, and let 0, 1, 2, 3, 4 indicate heads and 5, 6, 7, 8, 9 indicate tails. Enter H for heads and T for tails, and enter your ...

Finance
You have found the following stock quote for RJW Enterprises, Inc., in the financial pages of today's newspaper. The closing price for this stock that appeared in yesterday's paper was \$ (Do not include the dollar sign (\$). Round your answer to 2 decimal places. (e.g...

Finance
Ngata Corp. issued 12-year bonds 2 years ago at a coupon rate of 8.4 percent. The bonds make semiannual payments. If these bonds currently sell for 105 percent of par value, the YTM is ? percent

algebra
On January 1st a savings account showed a balance of \$280. How much interest will be earned by the end of the year at an annual rate of 5 1/4?

economics
how would a leader of a developing nation, a us citizen whose income is in the top 1%, and a us citizen whose income is in the bottom 5% talk about scarcity and trade-offs?

chemistry
Im not sure

Physics
Vterminal=square root of (4mg/pa) p=1.22(density of air) a=22cm=.22m/2=.11m(radius)... (pi)r^2=.038=a 85^2 = 4mg/pa 7225 = 4(m)(9.8)/(1.22)(.038) 7225(.038)(1.220)/(4)(9.8) = m 8.54kg=m

chemistry
.2M of NaOH(aq)

Chemistry
thank you! i think the answer is 0.00612 is the delta t

Chemistry
Calculate the boiling point elevation of a solution made from 15.0 g of a nonelectrolyte solute and 250.0 g of water. the molar mass of the solute is 50.0 g and Kb = 0.51 degrees C/m

chemistry
200. g of a nonelectrolyte is dissolved in 1.00 kg of water. the boiling point of the solution is then measured to be 101.5 degrees C. What is the molar mass of the compound? The Kb for water is 0.51 degrees Celsius/m

chemistry
200. g of a nonelectrolyte is dissolved in 1.00 kg of water. the boiling point of the solution is then measured to be 101.5 degrees C. What is the molar mass of the compound? The Kb for water is 0.51 degrees Celsius/m

8 layers:D

math
can i get answers to my homework ?

Biology
Divide the Cnidarian specimen into two groups. What feature did you use to make your divison? I just need a two sentence answer not a essay.

german
^^^^ lol like.

Biology
For what biological reason do farmers object to picking apple blossoms during the apple blossom season?

Biology
Explain why a heavy rainfall on a fruit orchard in the spring might result in a poor fruit yeild in the fall.

bucks
example of an derivative or innovative movie character

chemistry
What volume of SO2 will result from the complete burning of sulfer in 8L of oxygen?

Chemistry
What would happen to the color of a dilute solution containing FeCL4 if you added concentrated HCl?

global
How did geography help hinder Allied advances?

global
How did geography both help and hinder Allied advances?

globel
How did geography both help and hinder Allied advances

Social Studies
How did geography both help and hinder Allied advances?

Science
What are some examples of precipitate? Definition: an insoluble solid formed in a liquid solution as a result of some chemical reactions

Science
Whats an example of product? Definition: the substances produced in a chemical reaction

math
i think it is : 25c sqaured-5c-45c+9 25c squared-50c+9

math
NOO PROBLEM SOO MUCH :D

math
4(9.75h-3)=150 39h-12=150 39h=138 39h/39=138/39 3.6 when rounded

English
Is this a good sentence using the words: Procure: to get possession of; achieve If you study hard you will procure good grades. Beguile: to lead by deception; divert The dog beguiled the thief's attention away from the cowering people towards him. Truce: a suspension of ...

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