# 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)

**5th grade**

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**

Thanks for your help :)

**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**

why can't u google it?

**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

**6th grade**

With different kind of maps

**spanish**

Or google translate!

**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**

thank you, please help me.

**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 ...

**11th grade**

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

**5th grade**

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 ...