# Anna

Popular questions and responses by Anna-
## Polynomials

Write and simplify the polynomial represented by the model. (Model shows: 3 big blank squares, 2 long black rectangles, 3 small blank squares, 1 big black square, 6 small black squares) a. -2x^2 + 2x + 3 b. 2x^2 - 2x - 3 c. 3x^2 - 2x - 3 d. 2x^2 - 2x + 3

*asked on March 25, 2016* -
## chemistry

1. In the reaction 2Ca(s) + O2(g) → 2CaO(s), which species is oxidized?

*asked on November 12, 2015* -
## History

According to Americans living in the cities what was I sign of a communist revolution in the United States and the rise of mass culture be labor strikes see the deportation of anarchist did the great migration

*asked on January 25, 2019* -
## Calculus

If the volume of a cube is increasing at 24 in^3/min and the surface area of the cube is increasing at 12 in^2/min, what is the length of each edge of the cube? I know that dV/dt=24 and ds/ds=12. I also know that Volume=s^3 and Surface Area=6*s^2, but what

*asked on December 7, 2010* -
## physics

a pet truck is moving at 25m/s north, a dog inside moves at 1.75 m/s at angle 35 degrees east of north. What is the velocity of the dog relative to the road?

*asked on November 13, 2011* -
## Chemistry

How can I make 100ml 0f 2N of HCl? purity is 35% and density is given as 1.18 g/mL

*asked on May 21, 2016* -
## math cal

A plane flying horizontally at an altitude of 3 mi and a speed of 480 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 6 mi away from the station. (Round to the nearest

*asked on November 17, 2010* -
## Math help, anyone?

Solve the proportion. Where necessary, round to the nearest hundredth. Plz help i really need 2 get this in!! 11. 9/10 = x/10 9 *** 90 10 100 12. x/4 = 6/7 168 0.21 28 3.43 13.Write the ratio as a fraction in simplest form. 22:36 14. Write the ratio as a

*asked on November 26, 2013* -
## chemistry

Rank the following elements by electron affinity, from most positive to most negative EA value: tellurium, bismuth, neon, sodium, iodine i tried Te, Bi, Na, I, Ne and it was incorrect.

*asked on November 6, 2014* -
## physics

An object of mass m attached to a spring of force constant k oscillates with simple harmonic motion. The maximum displacement from equilibrium is A and the total mechanical energy of the system is E. What is the object's velocity when its potential energy

*asked on December 15, 2015* -
## physics

A slingshot consists of a light leather cup attached between two rubber bands. It takes a force of 32 N to stretch the bands 1.1 cm. a) What is the equivalent spring constant of the rubber bands? Answer in units of N/m.

*asked on February 24, 2011* -
## Physics

A loop circuit has a resistance of R1 and a current of 2.2 A. The current is reduced to 1.7 A when an additional 3 Ω resistor is added in series with R1. What is the value of R1? Assume the internal resistance of the source of emf is zero.

*asked on February 6, 2018* -
## math

find how many six-digit numbers can be formed from the digits 2,3,4,5,6,7 (with repetitions) if a) numbers formed must be even b) the numbers formed must be divisble by 25 c) the odd digits must occupy even position (2nd, 4th, 6th) and the even digits must

*asked on April 27, 2019* -
## Trigonometry

Let (7,-3) be a point on the terminal side of theta. Find the exact values of cos of theta, sec of theta and cot of theta?

*asked on March 20, 2014* -
## WORLD HISTORY

What effect did the eastern front have on World War I? (Select all that apply.) The heavy Russian losses, combined with food and fuel shortages, led to the abdication of Czar Nicholas II. The eastern front weakened German and Austro-Hungarian forces,

*asked on August 5, 2018* -
## Social Studies

Which of the following is the largest ethnic group in china A.Han B.tibetan C. Uighurs D. Hui Which of the following is the staple crop of the north China plain A. Barley B. Rice C. Soybeans D. Wheat Crops grow well on the north China plain because the

*asked on November 24, 2014* -
## Living Environment(please check answers)

1-true 2-false 3-not enough info Transplanting genetic material into bacteria is a simple task- 2 Under certain conditions, bacteria reproduce at a rapid rate-3 The continued use of insulin from animals many cause harmful side effects in some people- 1 The

*asked on March 12, 2012* -
## geometrey

The grade of a road is 7%. What angle does the road make with the horizontal? I'm confused!! What is the grade of a road? Thanks for the help!

*asked on March 10, 2008* -
## Math

There were d passengers in the train. 15% of all of them went in the first car, 20% went in the second car. How many passengers were in the rest of the train? D - 0.15d + (0.15d*0.2) + ? 0.15 + 0.03 = 0.18 I don't know what to do next?

*asked on April 3, 2017* -
## Physics

Location A is 3.00 m to the right of a point charge q. Location B lies on the same line and is 4.70 m to the right of the charge. The potential difference between the two locations is VB - VA = 45.0 V. What is the magnitude and sign of the charge?

*asked on February 5, 2007* -
## English

I am on my final exam and need to do the last two 16 point questions. Could someone help me out on the first one? Choose any two characters studied in Semester B, and compare them to one another. The characters that you choose may be characters in a story

*asked on June 11, 2018* -
## physics

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.5 x 10 exponent 5 kg, its speed is 27.0 m/s and the net braking force is 4.30 x 10 exponent 5 N, (A) what id its speed 7.50 s later? (b) how far has it

*asked on November 1, 2011* -
## spanish

Using the subject “usted” and the verb in the imperative, tell your instructor three things she or he must do. Then tell your instructor two things she or he must not do. You will be graded on accuracy and pronunciation. Provide your sentences in

*asked on April 18, 2011* -
## chemistry

Sodium chloride is decomposed into the elements sodium and chlorine by means of electrical energy. How many grams of chlorine gas can be obtained from 2.50 mol NaCl?

*asked on May 4, 2010* -
## math

If tan(xy) = x, then dy/dx =

*asked on December 30, 2011* -
## geometry

The coordinates for a rhombus are given as (2a, 0), (0, 2b), (–2a, 0), and (0, –2b). Write a plan to prove that the midpoints of the sides of a rhombus determine a rectangle using coordinate geometry. Be sure to include the formulas.

*asked on January 8, 2013* -
## Chemistry

Using the following data 1. CU3+ + 2e- ---> Cu+ E1= 1.28V 2. CU2+ + e- ---> Cu+ E2= 0.15V 3. Cu2+ + 2e- ----> Cu(s) E3= 0.34V 3. Cu+ + e- ----> Cu (s) E4= 0.52V calculate the standard reduction potential for the reaction of Cu(III) to Cu(II). Is it .783 V?

*asked on November 9, 2014* -
## Chemistry

This is a problem I got on my Mastering Chemistry homework: Consider the following reaction: H2(g)+I2(g)⇌2HI(g) A reaction mixture at equilibrium at 175 K contains PH2=0.958atm, PI2=0.877atm, and PHI=0.020atm. A second reaction mixture, also at 175 K,

*asked on March 16, 2014* -
## Physics

A 50 cm diameter wheel rotates through 25 radians. How do I figure out the amount of distance it will move?

*asked on January 29, 2015* -
## Calculus

If f(x)= sqrt(4sin(x)+2), then f'(0)=

*asked on December 8, 2010* -
## chemistry

Hi! Can you please check if my answers are correct? And, can you please tell me any other details you think are important to add. Also, the last two questions i have no clue how to answer. can you help? thanks so much! 3.A burning candle produces a

*asked on September 11, 2015* -
## Math

Draw two number lines that show 0.20 and 1/5 are equivalent

*asked on October 6, 2015* -
## chemistry

CH3OH(g) ----> CO(g) + 2H2 (g) (delta H =+90.7k) A) is heat absorbed or released in the course of this reaction? b) calculate the amount of heat transferred when 45.0g of CH3OH(g)is decomposed by this reaction at constant pressure. c) for a given sample of

*asked on October 17, 2011* -
## Social Studies

Compare the tactics used by the French troops in the French and Indian War with those of the American patriots during the Revolution.

*asked on September 12, 2016* -
## physics

Calculate the work and power done when a track athlete lifts a 20 kg barbell 0.6 meters in 0.8 seconds.

*asked on April 19, 2020* -
## Physics

A pair of speakers separated by distance d = 0.900 m are driven by the same oscillator at a frequency of 670 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers as in the

*asked on June 8, 2015* -
## chemistry

A chemist prepares a sample of hydrogen bromide and ﬁnds that it occupies 249 mL at 60◦C and 552 Torr. What volume would it occupy at 0◦C at the same pressure? Answer in units of mL

*asked on March 5, 2015* -
## history

1-Which of the following statements about literary movements is NOT true? (1 point) A A literary movement is a period that shares a particular set of ideas, concerns, or characteristics. B Ideas, concerns, or characteristics may be shared by literary

*asked on September 19, 2012* -
## Language Arts 6 A- Unit 3: Life Stories

15. Which sentence contains an error in subject-verb agreement? a. A family of squirrels live in my yard. b. Nobody wants to go to bed early. c. Chris and Susan live in the city. d. A group of elephants is called a herd 5. This selection was most likely

*asked on November 29, 2017* -
## Math

Find the missing length, round to the nearest tenth if necessary. There is a picture it shows a right triangle with side a being 14 and side b being 9 side c is ? I dont understand please help. A 4.5 B5 C 10.7* D 11

*asked on March 4, 2019* -
## Algebra

A ranger spots a forest fire while on a 45-meter observation tower. The angle of depression from the tower to the fire is 12 degrees. To the nearest meter, how far is the fire from the base of the tower? IS THE ANSWER 212 meters

*asked on February 18, 2012* -
## chemistry

A 2.00 L flask is filled with propane gas (C3H8)at 1.00 atm and -15.0 Degrees Celsius. What is the mass of the propane in the flask?

*asked on May 24, 2016* -
## Geometry

A rhombus has diagonals of length 4 and 10. Find the angles of the rhombus to the nearest degree. would the angles be 136 and 44?

*asked on March 10, 2008* -
## physiology

Which of the following statements is TRUE regarding bile? Bile is produced by the gall bladder, and secreted into the duodenum Bile is produced and secreted in response to CCK, which is in turn secreted primarily in response to high acidity of duodenal

*asked on April 26, 2010* -
## Math

Translate this phrase into an algebraic expression. 49 decreased by twice Vanessa's savings Use the variable v to represent Vanessa's savings.

*asked on January 7, 2017* -
## probobility

4 -letter "words" are formed using the letters A, B, C, D, E, F, G. How many such words are possible for each of the following conditions? (a) No condition is imposed. Your answer is : Preview (b) No letter can be repeated in a word. Your answer is :

*asked on March 22, 2016* -
## algebra

Company A rents copiers for a monthly charge of $360 plus 12 cents per copy. Company B rents copiers for a monthly charge of $720 plus 6 cents per copy. What is the number of copies above which Company A's charges are the higher of the two?

*asked on July 20, 2013* -
## chemistry

Calculate the amount of energy in the form of heat that is produced when a volume of 3.56 L of SO2(g) is converted to 3.56 L of SO3(g) according to this process at a constant pressure and temperature of 1.00 bar and 25.0 °C. Assume ideal gas behavior.

*asked on October 15, 2013* -
## Chemistry

Calculate pH and concentration of H2SO3, H2SO3- and SO32- in NaHSO3 c=0,05M. Ka1= 1,23*10^(-2) Ka2= 6,6*10^(-8) Results attached are: a) [H2SO3]= 1,04x10-4 M, [SO32-]=1,3x10-4 M, [HSO3-]= 0,05 M but i keep getting different numbers.

*asked on January 7, 2016* -
## Chemistry

A 76.00-pound flask of mercury costs $151.50. The density of mercury is 13.534 g/cm3. a) Find the price of one cubic inch of mercury by calculating the following intermediate values. What is the price of one pound of mercury? =$1.99 What is the price of

*asked on February 10, 2014* -
## Chemistry

A student heats 5.128g of the sodium carbonate/sodium bicarbonate mixture to a constant mass of 4.256g. Determine the mass of sodium bicarbonate present in the mixture.

*asked on February 28, 2010* -
## Chemistry

Use the van der Waals equation of state to calculate the pressure of 3.60 mol of NH3 at 489 K in a 4.50-L vessel. Van der Waals constants can be found here. P= Use the ideal gas equation to calculate the pressure under the same conditions. P= I have tried

*asked on October 23, 2015* -
## Spanish

Okay so I have some online activities and I'm not sure what they are asking. Situaciones Completa las oraciones con el tiempo verbal adecuado. A. Situaciones probables o futuras Si Teresa no viene pronto, nosotros ______ (tener) que ir sin ella. B.

*asked on April 27, 2009* -
## Chemistry

How many mL of 18 M H2SO4 are required to react with 250 mL of 2.50 M Al(OH)3 if the products are aluminum sulfate and water? How do i solve this?

*asked on April 30, 2010* -
## Calculus

A particle is moving around the unit circle (the circle of radius 1 centered at the origin). At the point (.6 , .8), the particle has horizontal velocity dx/dt=3. What is its vertical velocity dy/dt at that point? I don't know what equation to use or

*asked on December 7, 2010* -
## Biology Check answers

1. Which of the following correctly describes the image below? ￼ protein Molecule RNA Molecule amino Acid carboxylic Acid 2. Glucose and fructose are monosaccharides that have the same chemical formula, C6H12O6. However, they do not react the same

*asked on November 20, 2015* -
## Chemistry

HA and HB are two strong monobasic acids. 25.0cm3 of 6.0moldm–3 HA is mixed with 45.0cm3 of 3.0moldm–3 HB. What is the H+(aq) concentration, in mol dm–3, in the resulting solution? A 1.9 B 2.1 C 4.1 D 4.5 could you please explain how you reach an

*asked on May 18, 2019* -
## Math please help urgent!!

2. If m

*asked on February 18, 2016* -
## History

Which of the following statements best describes the middle class during the Industrial Revolution?A. The middle class lived in tenements because they faced harsher economic problems. B. The middle class women did not do physical labor and instead they

*asked on February 5, 2018* -
## Calculus

The table of values below shows the rate of water consumption in gallons per hour at selected time intervals from t = 0 to t = 12. Using a Trapezoidal sum with 5 subintervals, estimate the total amount of water consumed in that time interval. x 0 2 5 7 11

*asked on May 14, 2019* -
## Chemistry

The color of light emitted by a hot solid object depends on?

*asked on December 1, 2014* -
## Math

Mai has a piece of cloth that is 8.35 meters long. How many 15 centimeter pieces can she cut from the cloth? How much will be left over?

*asked on April 29, 2016* -
## Cultural Anthropology

In a band society, who would most likely be responsible for punishing a murderer

*asked on March 18, 2013* -
## Physics

The Golden Gate Bridge in San Francisco has a main span of length 1.28 km, one of the longest in the world. Imagine that a steel wire with this length and a cross-sectional area of 4.00 x 10-6 m^2 is laid on the bridge deck with its ends attached to the

*asked on June 15, 2015* -
## Calculus

Find two numbers whose difference is 132 and whose product is a minimum.

*asked on January 28, 2014* -
## Geography

a majority of the greenhouse gas emissions released into the atmosphere is composed of methane*** carbon dioxide oxygen nitrous oxide (my second guess)

*asked on May 16, 2016* -
## Physics

You have 250 g of water in an aluminium calorimeter with a mass of 125 g. How long will it take to increase the temperature of the water and calorimeter from 20C to 37C if the system is heated by a resistive heating element with 8 V across the resistor and

*asked on April 12, 2015* -
## Social Studies PLZ HELP ASAP

Analyze the effect that plentiful harvests had on population in the ancient civilizations of the mainland's river valleys. Write a one-paragraph answer. Plz help me with this, i dont understand.

*asked on May 1, 2018* -
## math/Probability

what is the probability of rolling a sum that exceeds 4 with two dice

*asked on June 11, 2010* -
## History

Which identify positive effects of New Imperialism? (Select all that apply.) introduction of medical vaccines enforcement of the abolition of slavery decline of indigenous beliefs and practices adoption of European styles of clothing C,D?

*asked on August 3, 2018* -
## Math

Stem-and-Leaf plots Use stem-and-leaf plot to answer questions 1-3 ----|----- 5| 4, 5 6| 0, 6, 9 7| 2, 3, 4, 5, 5 8| 1, 2, 8, 9 9| 5, 6 Key: 5|4 = 54 1. What is the range of data? A. 40 B. 42 ** C. 54 D. 96 2. What is the median of the data? A. 64.5 B.

*asked on April 30, 2018* -
## Pre-Calc

1.) Suppose that y varies directly as x. If y is 5 when x is 30, the constant of variation is 150. True Or False 2.) If w varies directly as z and w = 9 when z = -6, find w when z = 3. 3.) If y varies directly as x and y = 2 when x = 4, find x when y = 4.

*asked on October 2, 2014* -
## history

Which mostaccurately identifies a main difference between the revolutions led by Lenin and Gandhi? Lenin wanted to establish a Communist state, while Gandhi sought independence for India. Lenin wanted to establish a Communist state, while Gandhi fought to

*asked on August 5, 2018* -
## Spanish

Sra do theses look correct? Part I ¿Por o Para? Complete each statement correctly by choosing either POR or PARA. 1. Sacar buenas notas en esta clase es muy importante _____ mí. para 2. El drama Spy Kids fue escrito _____ Robert Rodríguez. por 3.

*asked on May 15, 2014* -
## Spanish

Are my answers correct? Parte I: Conteste las preguntas en frases completas en español 1. ¿Qué significan las palabras te y té? Te es un pronombre, mientras que el té es una bebida. 2. ¿Prefiere Ud. usar el tiempo futuro o IR A + infinitivo? ¿Por

*asked on April 10, 2014* -
## Algebra Square Roots

For which value of x should the following expression be further simplified? \sqrt{ 39x} a x = 2 b x = 6 c x = 10 d x = 11

*asked on February 2, 2017* -
## AP Chem

A chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as barium sulfate, BaSO4. How many grams of barium ion are in a 458-mg sample of the barium compound if a solution of the sample

*asked on November 3, 2008* -
## Physics

A 0.4 kilogram sample of Aluminum at 115 degrees Celsius is put into a container containing 0.5 kilograms of water at 15 degrees Celsius. Neglecting the small amount of energy absorbed by the container and knowing that the specific heat of Aluminum is 900

*asked on July 17, 2014* -
## Spanish

Sra. do my answers look correct? Part I Los mandatos en contexto. Escoge el mandato apropiado. Pon atención al contexto para determinar si es un mandato formal o informal. 1. Sé que Ud. tiene hambre pero, ¡no _______________! A. lo come B. lo coma C.

*asked on May 29, 2014* -
## Spanish

Hola Sra. Do these look ok? Part I Complete el párrafo por llenar los espacios en blanco con la forma correcta de los verbos entre paréntesis. ¡OJO ! No todos requieren el subjuntivo. Hoy martes estoy en el aeropuerto y tengo que pasar la aduana. El

*asked on March 20, 2015* -
## STATISTICS

A salesperson contacts eight potential customers per day. From past experience, we know that the probability of a potential customer making a purchase is .05. b.) What is the probability the salesperson will make exactly two sales in a day? this is what I

*asked on October 9, 2015* -
## geometry

The force of gravity pulling on an object down a hill is its weight multiplied by the sine of the angle of elevation of the hill. With how many pounds of force is gravity pulling on a 3000 lb car on a hill will a 3 degree angle of elevation? What i did:

*asked on March 12, 2008* -
## Math 105

Suppose you are looking to buy a $10,000 face value 13-week T-bill. If you want to earn at least 3% annual interest, what is the most you should pay for the bill? Round your answer to the nearest penny.

*asked on July 2, 2016* -
## science

identify the process that represents how organisms grow and replace old or damaged cells. Identify the process that is necessary for sexual reproduction, explain why it is necessary, and identify how this process increases genetic variation. (Hint: Answer

*asked on December 19, 2018* -
## Chemistry

The bromine content of the ocean is about 65 grams of bromine per million grams of sea water. How many cubic meters of ocean must be processed to recover 1.0 pounds of bromine if the density of sea water is 1.0 x 103 kg/m3?

*asked on September 19, 2012* -
## Math

Which expression is the same as 6 times 52? A) 2(50 + 6) B) 6(50 + 2) C) 6(5 + 2) D) 50(6 + 2)

*asked on March 20, 2019* -
## Science

explain how a microclimate can affect crop production I need someone to explain this to me because i don't get it

*asked on April 7, 2014* -
## Calculus

Find the critical numbers of the function. h(t) = t3/4 − 5t1/4

*asked on January 28, 2014* -
## Chemistry

What will happen when 100 ml of diethyl ether are added to 100 ml of water and thoroughly mixed? a.) Water will form a separate layer on top of the ether layer. b.)The temperature of the mixture will significantly increase. c.)There will be a chemical

*asked on August 12, 2012* -
## Math7 grade

Wallpaper was applied to one rectangular wall of the photographer s studio. .The dimension of the wall are shown below 42 ft by 25.5 feet .If the total cost of the wallpaper was &771.21, what was the cost of the wallpaper per square foot.

*asked on October 22, 2016* -
## AP Chem

A 3.50 g sample of KCl is dissolved in 10.0 mL of water. The resulting solution is then added to 60.0 mL of a 0.500 M CaCl2(aq) solution. Assuming that the volumes are additive, calculate the concentrations of each ion present in the final solution.

*asked on November 3, 2008* -
## probability math

you have a set of 10 cards numbered 1 to 10. You choose a card at random. event A is choosing a number less than 4. Event B is choosing an even number. Calculate the probability of A.

*asked on May 18, 2017* -
## Chemistry

What mass of salt(NaCl)should you add to 1.20 L of water in an ice cream maker to make a solution that freezes at -10.4∘C?

*asked on February 8, 2017* -
## Spanish

Sra. are my answers correct? Thank you! Part I ¿Subjuntivo, indicativo o infinitivo? Choose the correct verb form to complete each sentence. 1. Tengo miedo de que mi novio _____. A. mienta B. miente C. mentir B. miente 2. ¡Qué lástima que ese hombre no

*asked on April 30, 2014* -
## Chemistry

How much heat energy, in kilojoules, is required to convert 48.0g of ice at −18.0 ∘C to water at 25.0 ∘C ? Please show all steps. i don't know where to start

*asked on December 9, 2014* -
## chemistry

a 1.00 L aqueous solution contained 5.80 g of NaOH. what is the pH of the solution? Can someone help me out with the setup of this?

*asked on April 28, 2010* -
## AP Chem

A solution of hydrogen peroxide, H2O2, is titrated with a solution of potassium permanganate, KMnO4. It requires 51.7 mL of 0.145 M KMnO4 to titrate 20.0 g of the solution of hydrogen peroxide. What is the mass percentage of H2O2 in the solution? If you

*asked on November 3, 2008* -
## Math

The distance between Mountain View and crown top is 6.5 inches on a map if the scale on the map is 1 inch equals 25 miles what is the actual distance between the two towns 831.5 miles be 16.5 miles see 162.5 miles D 1 165 miles

*asked on January 28, 2019* -
## Calculus

What is the linearization of f(x)=e^x at x=1?

*asked on December 7, 2010* -
## science

A wolf us chasing a rabbit.Graph the wolf's motion using the following data: 15 m\s at 0 s,10 m\s at 3 s,1 m\s at 4 s,and 0 m\s at 5 s.What does the graph tell you???

*asked on December 1, 2012*