# sarah

Newest questions posted by sarah-
## Science

A serial dilution is set up with an initial antigen concentration of 250 ug/mL. A serial dilution is carried out where 20 uL is moved from each tube into an adjacent which has been prefilled with 80 uL of buffer. What is the tube concentration of tube 8, -
## Physics

An object is located at the point (−3.00m,4.00m,0.00m). A position vector connects this object to the origin. Find the magnitude of the position vector and the angle it makes with the positive x-axis. I know the magnitude is 5.00m, how do I find the -
## Physics

A given force F→ is located in the yz-plane. It has a magnitude of 18N and is directed at a 30.0° angle clockwise from the positive y-axis. (a) Describe F→ using polar notation. (b) Describe F→ using its y- and z-components. (c) Describe F→ using -
## English

What does Penny mean when she refers to "patriarchal surveillance" on the Internet? In the story "Penny Cybersexism" -
## Statistics

An important measure of the performance of a locomotive is its "adhesion," which is the locomotive's pulling force as a multiple of its weight. The adhesion of one 4400-horsepower diesel locomotive model varies in actual use according to a -
## chemistry

in nature, 51% of bromine atoms are bromine-79 and the other 49% are bromine-81. what is the mass number for each of these isotopes -
## Physics

A Chinook salmon can jump out of water with a speed of 6.60 m/s . How far horizontally d can a Chinook salmon travel through the air if it leaves the water with an initial angle of θ=27.0° with respect to the horizontal? (Let the horizontal direction the -
## Math

Use the well-ordering theorem to show that, if ∅ ⊂ A ⊆ Z and A is bounded superiorly (that is, there exists c ∈ Z such that for all a ∈ A a ≤ c), then A has a maximum element. -
## Georgia History

In a fully developed paragraph, explain how Georgia's location in the world affects its economy, culture, and development -
## History

Which accurately describe the causes of the contentious relationship between President Truman and General MacArthur? (Select all that apply.) a. Truman favored a containment policy on Communism, while MacArthur wanted to pursue the Communist forces into -
## History

Which battle was a major turning point for US and South Korean forces during the Korean War? a. Battle of Pork Chop Hill b. Spring Offensive c. Battle of Heartbreak Ridge d. Inchon Bay landing Is it D? -
## Maths

Parina spends 45% of her money on a dress and 15% on a bag.she had rs2400 left. how much she had at first? -
## Maths

Harry has 0.6 of his marbles to his younger bro and 0.5 of the remainder to his cousin. Harry has 36 marbles left. How many marbles did harry have at first ? -
## Math

A picture is 42 cm long and 32 cm wide. It has a 5 cm frame around it.all around the picture, 1 cm of the picture sticks into the frame so that the frame can hold it. What is the area of the frame? Plz help -
## Economics

In recent years, the governments of the industrially advanced countries have A. discouraged skilled developing countries' workers from emigrating to the industrially advanced countries. B. substantially reduced foreign aid to the developing countries. C. -
## math

Find the standard form of the equation of the parabola with the given characteristics. Vertex: (-9, 8); directrix: x = -16 -
## math

Write the equation of the circle in standard form. 9x^2 + 9y^2 + 72x − 108y + 368 = 0 Identify its center and radius. center (x, y) = radius = -
## math

Find the standard form of the equation of the circle with the given characteristics. Endpoints of a diameter: (1, −7) and (7, −5) -
## calclus

Chemistry teachers love to have different shaped beakers in their classroom (I guess it makes the classroom look for impressive). Different shaped beakers result in different rates the water level rises. Task: Determine the rate in which the water level -
## chemistry

How many moles of Cu2+ ions are present in 1L of .125M CuSO4:5H2O solution? -
## Physics

17. Explain how water can transfer energy by conduction and by convection. -
## algebra

Find an power function of the form y=ab^x whose graph passes through the points (4,4) and (16,8). -
## algebra 2

Car depreciation- The value of a new car purchased for $20,000 decreases by 10% per year. Write an exponential decay model for the value of the car. Use the model to estimate the value after one year. -
## History

What conflict resolution does Malala Yousafzai follow? Competition, Collaboration, Compromise, Accommodation, Avoidance _______________________________________________________________________ I am actually not sure. I used the conflict with Malala -
## History

What conflict resolution does Malala Yousafzai follow? Competition, Collaboration, Compromise, Accommodation, Avoidance _______________________________________________________________________ I am actually not sure. I used the conflict with Malala -
## History

What conflict resolution does Malala Yousafzai follow? Competition, Collaboration, Compromise, Accommodation, Avoidance _______________________________________________________________________ I am actually not sure. I used the conflict with Malala and -
## English- Poetry

How do authors use gothic and romantic elements to develop content and style that add beauty and power to their writing? (Examples to use: Poe—“Annabel Lee”, “Lenore”, “The Raven”, “The Pit and the Pendulum”--, “Mistletoe Bough”, -
## History

Mrs.Sue, I have completed three questions of the four. May you check them? I do not need help on the fourth one because my teacher still has to give us a booklet with the information and etc... I replied to the post that I posted: yesterday at 3:21pm -
## History

Who is Malala Yousafzai similiar to? I said Martin Luther King Jr, or Maya Angelou What are their goals? Malala:To provide 12 years of free, quality education to every child on the planet. She wanted to reach all those people who live in poverty, those -
## Calculus

Suppose the annual revenue for a company between 2000 and 2005 is approximated by R(t) = 18t^2 + 4t + 3, where t = 0 represents the year 2000. (a) Find the Average Value of R(t) between t = 1 and t = 6. (b) Find the Average Rate of Change of R(t) between t -
## Calculus -- Identity crisis

A function has f''(x) = 10 and has f'(4) = 0 and f(2) = 4. Find f(x). -
## Business

Researching different reason why an employee may choose to alter his/her number of federal withholding allowances. Next, write a paragraph of at least five sentence, in which you identify and discuss the two most compelling reasons you identified for -
## Chemistry

Calculate the standard entalphy of formation of naphthalene(C10H8) from the following data: 1) standard enthalphy of combustion of naphtalene is -5153kJ/mol 2) standard enthalphy of formation of CO2 is -393.5kJ/mol 3) standard enthalphy of formation of H2O -
## Biology 20

List the substances that the colon absorbs: - vitamins like B and K - water - ions like chloride and sodium Is there anything that I am missing? I am sure these are right but are there more?? -
## Science

minimum temperature required to dissolve 40g NaCl in 100g water thanks a ton -
## Science

100ml of 1.0 m KOH solution will neutralize 100 ml of 1.0 M H2SO4 solution Thank you! -
## Biology 20

Name 3 substances that the liver stores: 1) glycogen. When there is lots of sugar in the blood, the liver converts it into glycogen which is used for storage. Glycogen formed us determined by insulin which is released from pancreas. I'm not sure of what -
## english

The following passage contains ten run-ons and comma splices. Correct each error in the space provided by using (1) a period and capital letter, (2) a comma and a joining word, or (3) a dependent word. Be sure to use all three methods. The three sons of -
## Math

The farmer's boy has been sent to the market. He takes his dog for company. He also has a plump goose to sell, and a bag of corn. He knows he must be careful. He must make sure his dog doesn't have a chance to eat the dog, and he must make sure the goose -
## Chemistry

Determine the pH of a 0.45M solution of Na2SO3 where Ka1 = 1.5 x 10^(-2) and Ka2 = 6.3 x 10^(-8). -
## English

On the lines provided, write the word or words in each sentence that need to be followed by a comma. Be sure to include the commas. One comma rule applies in each sentence. Note To help you master the comma, explanations are given for five of the -
## math urgent

The state lottery (which has a 6% lottery tax) offers to pay winnings in 25 annual payments or one lump sum, sometimes called a cash-out option. This week’s lottery has a jackpot of $30 million and a cash-out value of $18.2 million. Granted that the odds -
## English

Each sentence below contains two examples of ineffective word choice. Underline each error. Then, in the space provided, write W, S, or C to indicate wordiness, slang, or cliché. Finally, use the answer line to rewrite each faulty expression, using more -
## math

The state lottery (which has a 6% lottery tax) offers to pay winnings in 25 annual payments or one lump sum, sometimes called a cash-out option. This week’s lottery has a jackpot of $30 million and a cash-out value of $18.2 million. Granted that the odds -
## Social

it is possible to be part of multiple nations simultaneously. however, in times of crisis, it is essential that loyalty to your country of residence take priority over any other loyalties. To what extent should we embrace the perspectives reflected in -
## Math

In how many different arrangements can 5 dogs and 7 cats be placed in a row if the dogs must be next to one another? -
## Social

it is possible to be part of multiple nations simultaneously. however, in times of crisis, it is essential that loyalty to your country of residence take priority over any other loyalties. I haven't ever done position papers in grade 11. I'm having a hard -
## Math

In a given city there are 28 reporters of which 16 are men. If the committee of 4 reporters is to be formed A. How many different committees can be formed? B. How many different committees contain 3 men? C. How many different commitrees contain at least 2 -
## biology

The DNA bases adenine and guanine have one nitrogen and carbon atom containing ring in their structure. These bases are known as __________. -
## English

The following passage contains eight fragments. Underline each fragment. Then rewrite it correctly on the lines below. Note To help you recognize and correct fragments, explanations are given for half of the items. The game of Monopoly was created by -
## biology

Why did Nicholas Copernicus wait to publish his works on his deathbed? His work on the three laws of motion contradicted the Lutheran Church. His work on heliocentric theory went against Catholic doctrine and beliefs. His work included the dissection of -
## biology

Which best describes Francis Bacon’s contribution to the Scientific Revolution? -
## chemistry

In the titration of Na2S2O3 against KIO3 the average titre value was 23.1cm3,the volume of iodine used in the titration was 25cm3 and the concentration of Na2S2O3 was 0.1M.calculate the molarity of KIO3 -
## Biology 20

Identify one biochemical that is of particular significance to your animal. Explain why it is significant to your assigned animal and describe it. This chemical could be an enzyme, a toxin, something used in scent marking, or any other biochemical agent -
## Biology 20 please help

State 2 molecules that get reduced and 2 that get oxidized during photosynthesis. ---------------------------------- I know that NADPH and Glucose are in their reduced form. 2 molecules that get reduced. Will it be NADP+ because it is gaining 2 -
## Advertising research: theory and practice

James wants to change the creative strategy in order to make consumer think differently about his product. He wants the product to be viewed as a product for sports enthusiasts. In order to do this, he must: a. conduct demographic research b. reposition -
## Advertising research: theory and practice

Amanda would like to develop a product for Coca-Cola for health conscious consumers. She first needs to conduct adequate _______ segmentation research in order to find out more about the market. a. positioning b. psychographic c. individualized d. -
## Advertising research: theory and practice

research primarily uses open-ended, probing questions to encourage consumers to discuss and share their thoughts and feelings on a particular subject. a. Quantitaative b. qualitative c. secondary d. primary -
## Social

we talk about the birth of nationalism being the french revolution. why might the americans dispute this -
## Math (Pre Calc)

If two forces of 5 lb. and 8 lb. are acting on the same point are equivalent to a single force of 10 lb., find the angle between the given forces, and the angle between the resultant and the larger force. I am not allowed to use law of cosines I must use -
## Math (pre calc)

You have recently been promoted and are now a senior pilot with BHS Exprress, providing courteous and timely service to countless cities across the Northeast. In order to arrive in New York City at the scheduled time, you know you must fly at a speed of -
## Pre Calc

You have recently been promoted and are now a senior pilot with BHS Exprress, providing courteous and timely service to countless cities across the Northeast. In order to arrive in New York City at the scheduled time, you know you must fly at a speed of -
## Pre Calc

If two forces of 5 lb. and 8 lb. are acting on the same point are equivalent to a single force of 10 lb., find the angle between the given forces, and the angle between the resultant and the larger force. -
## math

You are ordering photo prints online to send out to all your friends for the holidays. The first 20 prints cost 12¢ each, if you order more than 20 the price of the additional prints goes down to 8¢ each. a. Write a function to describe the cost of the -
## Chemistry

How do I plot the freundlich isotherm graph given P/atm and V/cm3 data. I know that the plot is suppose to be log x/M vs log c. However, how do I get the x/m from the data and which is the c. I have already plotted the Langmuir isotherm of this data. How -
## chemistry

Commercial aqueous hydrogen peroxide was diluted 150 times. 25cm3 of the sample solution was titrated with 0.02molar KMnO4 and 26.3cm3 was required to reach the end point. Calculate the molar concentration of hydrogen peroxide -
## Math

A rectangle whose length is 5.3 cm and whose width is 2.5 cm. -
## math

emma made a rectangular picture frame with a heigth of 25 5/6 inches. The frame is 5 2/3 inches wide. What is the hieght of the picture emma placed in the picture frame? explain how you found your answer? -
## Chem

A reaction of 48.5 g of Na and 53.7 g of Br2 yields 55.4 g of NaBr. What is the percent yield? 2Na(s)+Br2(g)--->2NaBr(s) -
## chem

How many moles of N are in 0.223 g of N2O? I have tried the answers 0.01508 but it is wrong I dont know what I am doing incorrectly plz help Thank You -
## Chem

How many grams of Cl are in 365 g of CaCl2? -
## Chemistry

The thermal decomposition of 1.6608 g of MgSO4 * H2O produces 1.4446 g of a product in a well-behaved reaction. There are two possibilities: 1) MgSO4 * H2O(s) -> MgSO4(s) + H2O(g) 2) MgSO4 * H2O(s) -> MgO(s) + SO3(g) + H2O(g) Complete the following -
## Social

Is Metis nation a distinct nation in canada? and How? Can I please get websites that I can look at? I saw so many but it is so much information and each website has different facts. -
## English

Each sentence in the following passage contains one mistake in subject-verb agreement. Find and underline the ten verbs that do not agree with their subjects. Then write the correct form of each verb on the lines below. Note To help you learn subject-verb -
## American Government

How has a recent supreme Court ruling affected your life? Do you agree or disagree with the court's decision in this case? -
## Geology

Differences and similarities between a physical geologist and a historical geologist -
## math

what is 18% of 75? -
## Math

A group of teachers and pupils attended a concert. The teachers paid $1200 altogether and the pupils paid $640 altogether for their tickets. The price of an adult ticket was $60 and there were 4 more female teachers than male teachers. How many male -
## Math

I Can Multiply The Number Of_______In A Polygon By________To Find The Sum Of Its Interior Angles -
## Chemistry

please explain how to do it I have no idea where to start! Thank You If you burn 30.2 g of hydrogen and produce 2.70 × 102 g of water, how much oxygen reacted? -
## Chemistry

Convert 4.39 × 10-3 m to the equivalent length in nanometers. please explain how to do it I have no idea where to start! Thank You -
## Physics

Can acceleration of object have a negative quantity ? -
## Physics

Calculate the velocity of a 6kg riffle that shoots a 0.025kg bullet at a speed of 615m/s. -
## Physics

Two vectors have a magnitude of 2.5km and 6.5km . Predict the maximum and minimum magnitude of their resultant vector -
## Physics

A snooker ball with a mass of 0.3kg moving at 2.5m/s collides with another ball of 0.2kg mass and moving in the same direction with a speed of 1.20m/s . Assuming the collision is elastic, calculate the speed and direction of each ball after collision. -
## Physics

A ball is thrown horizontally at 18m/s from the roof of a building lands 28metre from the base of the building. Calculate the height of the building. -
## Physics

vector A is 5.5cm and points 60°above the positive x-axis. Vector B is 6.5cm and points along thr negative x-axis. Calculate the magnitude and direction of the resultant of these two vectors. -
## Physics

A bullet is fired horizontally and penetrates into a block of wood. The block and bullet then move together after impact. Explain the total linear momentum and total kinetic energy of the system before and after the collision -
## Physics

A ball of mass 1.20kg falls vertically and hits a horizontal floor at 2.50m/s . The ball then rebounds upward at 10.00m/s . If the ball is in contact with the floor for 0.02 seconds, compute the average force exerted on the floor. -
## Physics

A projectile is shot horizontally at 34.5m/s from the edge of a 55.0metre building . Determine the height of the projectile from the ground after 2.0seconds . -
## English

In the story "The Lemon Tree Billiards House" Is the narrator trustworthy? Can we believe his story? Explain. -
## English

From the story "The Lemon Tree Billiards House", provide 2 examples of a humorous tone and explain why/how this is funny. -
## Math

an airplane travels 500 km with the wind in the same time that it takes the airplane to travel 400 km against the wind. the average speed of the plane in still air is 180 km/h. what is the average speed of the wind? Airplane with wind: Distance: 500km -
## Chemistry! urgent

what volume of gas at 40°C and 1.50 atm is necessary to react with 300 L of hydrogen gas measured at the same conditions? 2H2 (g) + O2 (g) --> 2H20 (g) 1.50 atm= 151.KPa How would I solve this? Because I can't use: PV = nRT I have pressure, -
## Math,Calculus

The function’s value will always be greater than or equal to the local linear approximation of a function f if, for all x in an interval containing the point of tangency a. f’’>0 B. F’’<0 C.f’>0 D.f’<0 -
## Chemistry

I'm not really sure how to do this. I've tried many ways and I can't get the right answer of 0.0569 mol/L H3PO4 100.0 mL of a solution containing 2.55g of potassium hydroxide is mixed with 100.0 mL of a 1.50 mol/L phosphoric acid solution. Will the -
## Chemistry

Why are the hydrogen bonds of a certain molecule weaker in solution (with water as a solvent) than in a vacuum? I'm supposed to have three reasons, and so far all I can come up with is that the water lowers the activation energy required to form the bond -
## Chemistry 20

which of the following indicators would show an intermediate endpoint of color of orange: bromocresol green, methyl red, phenolphthalein or methyl violet? No clue how to do this. And what does it mean to show an intermediate endpoint. Please help -
## Chemistry

I've been given a table with the following information: Br-Br bonding energy (298 K): 192.807 kJ/mol Br2 vaporization energy: 30.91 kJ/mol boiling point of bromine: 332 K The question reads, "A chemist heats liquid bromine to 335K, and a gas forms. Is the -
## English

I need help doing a thesis for Macbeth by Shakespeare. I'm focusing on the character Macbeth and my theme is ambition. Intially: -He is shown as a loyal soldier who is kind (fill with the mill of human kindness) -He gets startled when the witches tell him