# Aria

Popular questions and responses by Aria-
## Chemistry

Select the statements that correctly describe buffers.? 1) The pH of a buffer solution does not change significantly when any amount of a strong acid is added. 2) The Ka of a buffer does not change when any amount of an acid is added to the buffer

*asked on September 23, 2013* -
## English

Which of the following is a simple sentence? A. Many are called, but few are chosen B. A penny saved is a penny earned C. Fools rush in where angels fear to tread D. If at first you don’t succeed, try, try again 2. Which of the following is a compound

*asked on October 26, 2017* -
## Math

Two complementary angles have measures of s and t. If t is less than twice s, which system of linear equations can be used to determine the measure of each angle?

*asked on April 19, 2017* -
## Math

Decide what values of the variable cannot possibly be solutions for each equation. Do not solve. 2x/x+1 + 3/5x+5=0

*asked on November 8, 2016* -
## Chemistry

100 mL of 1.0 M formic acid (HCOOH) is titrated with 1.0 M sodium hydroxide (NaOh). The Approximate pKa is 4 At the pKa, what fraction of the carboxyl group will have been converted to COO-?

*asked on September 27, 2013* -
## Math

Find the coefficient of x^4y^3 in the expansion of (x+2y)^7

*asked on June 2, 2017* -
## Math

In 7 days, Mario cooked 98 pounds of spaghetti. Each day after the rst, he cooked 2 more pounds than he cooked than the day before. What is the difference between the average (arithmetic mean) number of pounds of spaghetti he cooked per day and the median

*asked on July 28, 2017* -
## Chemistry - Half-life

Phosphene decomposes to phosphorus and hydrogen in a first order mechanism. 4PH3(g) --> P4(g) + 6H2(g) This reaction's half-life is 35.0 s at 680 degrees C. If you had 520 mmHg of phosphene in an 8.00-L flask, how long does it take for the pressure in the

*asked on April 25, 2012* -
## geometry

what is the area of a rhombus with a 60 degree angle and sides 5 cm long? (round to the nearest 10th)

*asked on March 29, 2011* -
## Math

Find the coefficient of x^5y^7 in the expansion of (5x+2y)^12 12 (x)^5 (2y)^7 3 My answer which i got wrong is 220x^5(128y^7)= 28160x^5y^7

*asked on June 1, 2017* -
## Math

If 4

*asked on November 3, 2016* -
## Chemistry

The rock in a particular iron ore deposit contains 84 % Fe2O3 by mass. How many kilograms of the rock must be processed to obtain 1100 kg of iron?

*asked on March 31, 2016* -
## Geometry Math

In designing a circular flower bed where the diameter of the circle is 13 feet long, a gardener decides it would look best to space the flowers 7 inches apart. How many flowers will be needed around the outside of the flower bed? (I've tried finding

*asked on December 4, 2017* -
## computer

The field names in a database are also known as A. category or column heading ** B. The name of a row C. Individual cells in a database D. Records Am I right..?

*asked on December 1, 2015* -
## Math

A new fence is constructed on three sides of a housing block with area 240 m2. The fourth side facing the road is left open. If 52 m of fencing is used, what are the dimensions of the block?

*asked on March 29, 2015* -
## Math

An open-topped box is constructed from a piece of cardboard with a length 2 cm longer than its width. A 6 cm square is cut from each corner and the flaps turned up from the sides of the box. If the volume of the box is 4050 cm3 , find the dimensions of the

*asked on March 24, 2015* -
## Statistics

Two of the biggest soft drink rivals, Pepsi and Coke, are very concerned about their market shares. The pie chart that follows claims that PepsiCo's share of the beverage market is 25%. Assume that this proportion will be close to the probability that a

*asked on February 28, 2014* -
## Biochemistry

1. What is the overall charge of the tripeptide below pH 1.0? 2. What is the overall charge of the tripeptide at pH 12? 3. What type of intermolecular attractions could the side chains of the amino acids make with the solvent (water) at pH 7.4? (Note that

*asked on October 5, 2013* -
## Physics question

A box of mass 25kg is sitting on a horizontal plane and has a normal force pointing down of 31N, and the coeff of kinetic and static friction between the box and floor are .22 and .38, respectively. What is the min horizontal force F needed to make the box

*asked on October 2, 2017* -
## Math

Aubrey can run at a pace of 6 miles per hour. Running at the same rate, how many miles can she run in 90 minutes?

*asked on July 31, 2017* -
## Math

Find a1 and r for the geometric sequence: a4= -1/4 and a9= -1/28

*asked on May 17, 2017* -
## Math

During an epidemic, the number of people who have never had the disease and who are not immune (they are susceptible) decreases exponentially according to the function where t is time in days. f(t)=15,000e^-.05t Determine how long it will take for the

*asked on March 28, 2017* -
## Math

The square root of 1 less than twice a number is equal to 2 less than the number.Find the number.

*asked on November 9, 2016* -
## Chemistry

Consider the generic reaction between reactants A and B: 3A+4B→2C How many moles of B will be in the reaction vessel once the reactants have reacted as much as possible? (Assume 100% actual yield.)

*asked on April 29, 2016* -
## Chemistry

A sample of propane, C3H8, contains 10.0 moles of carbon atoms. How many total moles of atoms does the sample contain? Express the total number of moles of carbon and hydrogen numerically.

*asked on March 30, 2016* -
## Physics

A 0.22 calibre rifle shoots a bullet of mass 1.8 g with a muzzle velocity of 500 m/s. If the barrel is 25 cm long, what is the average force exerted on the bullet while it is in the barrel?

*asked on June 22, 2012* -
## Math

Two consecutive integers are squared. The sum of these squares of these squares is 545. What are the integers?

*asked on June 5, 2012* -
## Physics

How many calories are needed to change 1 gram of 100 degrees Celsius boiling water to 100 degrees Celsius steam?

*asked on March 23, 2011* -
## algebra

Which quantity is larger? a. 100^500 b. 1000^300 c. they are equal d. insufficient information I believe it is B but can someone check? Thanks!

*asked on May 18, 2020* -
## Science

If don't mind could you check my answers for environmental science 1.The interdisciplinary study of humanity’s relationship with other organisms and the non-living physical environment is termed: a) ecology b) sociology c) political science d) risk

*asked on October 2, 2017* -
## Check answers

Environmental science Explain why the energy pyramind levels change in size? There is not enough energy to support the organisms that are higher up in the energy pyramid because too much energy gets lost. What is the ultimate source of energy for most food

*asked on September 13, 2017* -
## English

To what extent does writing connect with people and society? Provide one source thats supports and one source that refutes. The two sources must examine the topic from different perspectives. The sources I already have is: writing and reading

*asked on June 4, 2017* -
## Math

Write out the first five terms of the sequence an=3(4n-1)

*asked on May 30, 2017* -
## Anatomy

What consequence would an over abundance of acetylcholine have both overall and at the molecular level of the muscle?

*asked on February 22, 2017* -
## math

Oceanographers use a quantity known as shoreline development to describe and categorize bodies of water. Shoreline development, D, measures how closely a body of water resembles a circle. Its formula is: where L is the shoreline length and A is the area of

*asked on February 5, 2017* -
## Math

Find the vertex H(x)= -3x^2+24x-46

*asked on January 8, 2017* -
## English

Identify and explain a rhetorical strategy used by hawthorne in order to build tension between Chillingworth and Prynne in chapter 4 of the scarlet letter. His choice of words represent suspense between the two. I don't know

*asked on December 11, 2016* -
## Math

Dividing complex numbers 7-13i/2i

*asked on October 8, 2016* -
## Chemistry

The efficacy of certain drugs is affected by pH. Many drugs are absorbed into the blood through cells lining the stomach or the small intestine by direct diffusion across the plasma membrane. Since the interior of the plasma membrane is hydrophobic,

*asked on September 23, 2016* -
## World history

What were the effects of Islam on the different culture of ancient African empires ?

*asked on June 8, 2016* -
## World history

How did Ghana, Mali, and Songhai get so advanced? The main export was gold, which made each kingdom wealthy and strong, and provided them with the conditions necessary for cultural and intellectual achievement. Is this the answer??

*asked on December 17, 2015* -
## Calculus

Hello, I really need help on these two homework problem. >< In problem #1, I believe it is related to the exponential functions and their derivatives section...in Calculus II? So, surely there should be a ln in the solution as well? I would like a step by

*asked on January 31, 2015* -
## Statistics

Let X be a binomial random variable with n = 100 and p = 0.2. Find approximations to these probabilities. (Round your answers to four decimal places.) P(17 < X < 28) I get the answer as 0.7059 but it is wrong. I can't seem to figure this out... Help please

*asked on February 27, 2014* -
## math

Cohen has consistently averaged 120 yd. of horizontal distance with his 7-iron over the last two years playing golf. His ball flight typically reaches a maximum height of 24 yd. (Hint: A rough sketch will help you) a.) Create a function in vertex form that

*asked on June 5, 2012* -
## Biology

Suppose that black hamsters were found to be 70% of the population and the gray hamsters 30% of the population. Calculate the percentage of BB, Bb, and bb hamsters in the next generation. - I don't know how to calculate the percentage of the genotypes.

*asked on March 26, 2012* -
## Chemistry

If you mix 20.0 mL of 1.00 x 10-4 mol/L NaCl with 20.0 mL of 2.00 x 10-6 mol/L AgNO3 will a precipitate form ? If it does it will be AgCl, which has a Ksp of 1.80 x 10-10. i'm not quite sure how to figure this out...

*asked on February 21, 2012* -
## Chemistry

A chemical reaction taking place on the surface of a block of sodium will not occur faster if the a. size of the block doubles b. block is cut in half c. surface area is increased d. amount of sodium is decreased

*asked on February 21, 2012* -
## chemistry

Consider the following reaction: 2 NO(g) + O2(g) ---> 2 NO2(g) + energy if the number of moles of oxygen is increased to two moles, the a. reaction speeds up b. reaction slows down c. temperature increases d. temperature decreases I'm not really sure what

*asked on February 21, 2012* -
## vocabulary

what is self delusion? the definitions online are very confusing..Can someone explain it to me in simpler terms. Also would depression be a form of self delusion?

*asked on May 2, 2011* -
## Algebra

I was given this problem to solve and no matter what order I multiply the variables I don't get the right answer. 27xy, when x=12.7 and y=100.4 the answer is 34,427.16 I cannot figure out the way to achieve this answer. I find problems with variable fairly

*asked on April 15, 2011* -
## math

how much money will a customer save if she buys 110L of absence at this gas station but with a 5 cent discount and no minimum quantity required???

*asked on April 15, 2020* -
## Science

How can erosion and deposits form a plain?

*asked on September 16, 2019* -
## English

The climax of “Rikki-tiki-tavi” occurs when

*asked on September 9, 2019* -
## Programming

The question is: You have recently been employed by a company that specialises in application development. Your first project is to help them design an application using Python that will help shoppers determine which products to buy at the supermarket and

*asked on July 23, 2019* -
## maths

10 men can build a house in 6 months. How long would it take 3 men?

*asked on September 21, 2018* -
## World History

Which accurately describes the rise of Napoleon Bonaparte’s power to overthrow the French government?

*asked on February 7, 2018* -
## Algebra 2

Part A: For what real values of c is x^2 + 16x + c the square of a binomial? If you find more than one, then list your values separated by commas. Part B: For what real values of a is x^2 + ax + 25 the square of a binomial? If you find more than one, then

*asked on October 7, 2017* -
## Math

Say i have a box plot and I'm trying to determine the shape. My mean is 119.6 My median is 51 Would the shape be skewed to the right ?

*asked on September 28, 2017* -
## Math

Say i have a box plot and I'm trying to determine the shape. My mean is 119.6 My median is 51 Would the shape be skewed to the right

*asked on September 28, 2017* -
## Environmental science

Assume the biomass of the organism at the bottom of the trophic is 5,000 lbs. predict the approximate mass of each of the remaining levels, explain why the mass is changing.

*asked on September 24, 2017* -
## Environmental science

If anyone doesn't mind could they explain the biogeochemical cycle. What are the sinks? How do they work ? How do humans affect them?

*asked on September 24, 2017* -
## Science

Say you had a pond that initial had 30 fish. There was 3 fisherman collecting at least 2 fish to feed their family, They fish for 3 seasons ? At the end of the day you would double the fish whatever you had left. $5 a fish What happened to amount of food

*asked on September 17, 2017* -
## History

What additional risk or costs do entrepreneurs assume when they choose to work for themselves ? ( like compensation packages)

*asked on September 14, 2017* -
## Environmental science

Why does the energy pyramid levels change in size ? What would happen to a food web if one of the primary consumers was removed from the system ?

*asked on September 13, 2017* -
## EPI

I need help finding a principle of economics. The principal is people choose. The text is called "Why we're still fighting the civil war " by David Von Drehle. Time Magazine has the article. My answer is "Abraham Lincoln said that a single issue dividing

*asked on September 12, 2017* -
## English

How does Millhouser manipulate diction in order to create a theme in " Dangerous laughter".

*asked on September 9, 2017* -
## English

Identify the novel's point of view and discuss the effect of any significant shifts in the narrative voice. In other words, when does the protagonist's point of view change within the novel and why is it important. Novel is called The Awakening by kate

*asked on September 2, 2017* -
## Math

If 2x=5, 3y=4, and 4z=3, what is the value of 24xyz ?

*asked on August 1, 2017* -
## Math

If the following function was transformed to g(x-2)+3, find g(2)

*asked on June 6, 2017* -
## Math

Consider the system of equations y= -x^2+9 y=3/x Find the solution of the system to four demimal places

*asked on June 6, 2017* -
## Math

A certain type of bacteria is growing at an exponential rate that can be modeled by the equation y=ae^kt, where t represents the number of hours. There are 300 bacteria initially, and 1500 bacteria 5 hours later. How many bacteria will be present at time

*asked on June 6, 2017* -
## Math

A certain type of bacteria is growing at an exponential rate that can be modeled by the equation y=ae^kt, where t represents the number of hours. There are 300 bacteria initially, and 1500 bacteria 5 hours later. Find the rate of growth, k, of the

*asked on June 4, 2017* -
## Math

Geometric series: n= infinity sign a1=5 r= -1/4 The equation 5(-1/4)^i-1

*asked on June 2, 2017* -
## Math

Geometric series: Finite and infinite n=5 a1=243 r=2/3 i=1 This is the equation 243(2/3)^i My answer is 633 n=infinity sign a1=5 r=-1/4 i=1 The equation 5(-1/4)^i-1 I think its undefined

*asked on June 1, 2017* -
## Math

Arithmetic sequences Find a8 and an for the sequence: -3, -7,-11

*asked on June 1, 2017* -
## History

Why was Defense secretary McNamara Gloomy ?

*asked on May 24, 2017* -
## English

I need help finding three more Nonfiction signposts from the book called " bird by bird " by Anne Lamott.

*asked on May 22, 2017* -
## Math

find a5 and an for the geometric sequence: a1=8 and r= -5

*asked on May 17, 2017* -
## Social Studies

12. What is one cost that victory in the cold war brought to the united states?

*asked on May 17, 2017* -
## Math

Arithmetic sequence: For a8 and an for the sequence: -3,-7,-11 My answer a8=33

*asked on May 15, 2017* -
## Math

write the first five terms of a sequence where the first term is 8 and the common difference is 6. My answer: 8,14,20,26,32

*asked on May 15, 2017* -
## Math

Solve by substitution: 2x= -y+3 5x-y=11

*asked on May 3, 2017* -
## History

Was the U.S. successful in stopping the spread of communism in Europe prior to 1950?

*asked on April 26, 2017* -
## Math

Evaluate the determinant of each matrix -3 2 -3 0 -1 -1 3 0 -3 My answer is -36 The correct answer is -24 but I don't understand how they got the answer.

*asked on April 25, 2017* -
## Math

Find the inverse for the following matrices: 2 and -4 is on top 6 and 3 is on bottom My answer is 90 120 -180 60

*asked on April 25, 2017* -
## Math

Shania bought a new computer for 1,550 from computer 'r' us. If the value of the computer depreciates at a rate of 5.35%per year, when will the value of the computer reach 825 ?

*asked on March 31, 2017* -
## Math

The amount of radiocarbon present after t years is given by y=ae^-.0001216t . find the half live of 14

*asked on March 31, 2017* -
## Math

If current trends of burning fossil fuels and deforestation continue, then future amounts of atmospheric carbon dioxide in parts per million (ppm) will increase exponentially. In the year of 1990, there was 353 ppm. A)In the year of 2000, there was 375 ppm

*asked on March 31, 2017* -
## Math

Solve the missing variable e^(x+6)+5=1

*asked on March 28, 2017* -
## Math

Solve for the missing variable. 4^x =2 Example: 3^2n+1 = 3^4 Cross out both the threes 2n+1 =4 Subtract 1 2n=3 n=3/2

*asked on March 12, 2017* -
## English

Take a position that explains if, and to what degree, modern American culture is an outgrowth of the philosophies of the Founding Fathers. I agree that American culture is an outgrowth of the philosphies of the founding fathers. I have one reason and that

*asked on February 27, 2017* -
## anatomy

describe in detail how a lack of calcium ions would affect muscle contraction.

*asked on February 22, 2017* -
## Math

Graph the following polynomial. f(x)=(x+3)^2(x-2)^2(x+5) How would i graph ? f(x)=(x+5)

*asked on February 7, 2017* -
## Math

Divide into intervals and evaluate to find the max/min. f(x)= -(x-1)^2(x+4) I pick -2 -(-2-1)^2(-2+4)=-18 Is that the correct answer

*asked on February 5, 2017* -
## English

Express how the device below and structure helps acheive the purpose of chapter 4. The book is called Narrative Of The Life Of Fredrick Douglass. I just need to write a paragraph. given: brutality of slavery device: diction and structure All i know is for

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

Describe how you use your calculator to find the exact zeros of a function.

*asked on January 26, 2017* -
## English

What is the impact of the anaphora used in the list of grievances? (i.e the repetition of "he has". The text is call "In congress, July 4,1776" .

*asked on January 25, 2017* -
## Math

Tylenol 3 has 16 mg of Codeine per 11 ml of liquid. A safe dose of Codeine is 4.8 mg/Kg/Day. A patient who weighs 215 pounds needs a Tylenol 3 prescription. There are 2.2 pounds for every 1 kilogram. How many kilograms is this person's mass? How many

*asked on January 23, 2017* -
## Math

There is an error in the student work shown below: Question: Divide (x^3-8)/(x-2) The student did long division and the got x^2 remainder -6+2x^2

*asked on January 22, 2017* -
## English

Explain to what extent religion does or does not belong as part of government policy. Three reasons

*asked on January 2, 2017*

## Pages

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