# autumn

Most popular questions and responses by autumn-
## Math

Solve: ((2^x)-7)^2 = 1 The answer should be x = 2.58 (3 s.f.) or x = 3 but I have no idea how to get there. Thanks in advance!

*asked on April 18, 2019* -
## Physics

A hummingbird has a mass of about 1.7 g. Suppose a hummingbird does 0.15 J of work against gravity, so that it ascends straight up with a net acceleration of 1.2 m/s (squared). How far up does it move?

*asked on January 23, 2012* -
## Chemistry

Sulfur dioxide reacts with oxygen to form sulfur trioxide according to the equation 2SO2(g) + O2(g) 2SO3(g) Samples of sulfur dioxide, oxygen, and sulfur trioxide were added to a flask of volume 1.40 dm^3 and allowed to reach equilibrium at a given

*asked on November 20, 2017* -
## Math

A moving company charges $0.60 per pound for a move from New York to Florida. A family estimates that their belongings weigh about 6 tons. About how much would it cost the family to move from New York to Florida?

*asked on April 13, 2017* -
## Chemistry

The following table shows how the initial rate of this reaction depends on the concentrations of the two reactants [NO] [O2] Initial rate 0.0050 0.0050 0.02 0.0050 0.0075 0.03 0.010 0.0075 0.12 Use the data to determine the order of reaction with respect

*asked on March 31, 2019* -
## Chemistry

Identify the substance liberated at each electrode during the electrolysis of AgNO3 with inert electrodes. I know that Ag is liberated at the cathode, but how about the anode? Thanks in advance!

*asked on April 21, 2019* -
## math

Mani, James, and isidro equally shared 1/2 of a pie. Which fraction of the whole pie did each of them receive ?

*asked on April 4, 2015* -
## Biology

Pretty confusing AS Biology question: A scientist carried out an experiment to separate the organelles in an animal cell by mass. The scientist mixed the cells with a buffer solution which had the same water potential as the cells. He then broke the cells

*asked on June 5, 2018* -
## Chemistry

When one mole of ammonia is heated to a given temperature, 50% of the compound dissociates and the following equilibrium is establised. NH3(g) 1/2N2(g) + 3/2H2(g) (note: is my sad attempt at the equilibrium symbol) What is the total number of moles of gas

*asked on November 20, 2017* -
## Math & a bit of Physics

A block of mass 11 kg is at rest on a rough plane inclined at 30° to the horizontal. A force acts on the block in a direction up the plane parallel to a line of greatest slope. When the magnitude of the force is 2X N the block is on the point of sliding

*asked on November 22, 2017* -
## Probability

The probability that an event A occurs is P(A) = 0.3 . The event B is independent of A and P(B) = 0.4 . a) Calculate P(A or B or both occur) . Thanks in advance for the help!

*asked on November 6, 2018* -
## Algebra

An ice cream shop has 19 flavors. You also have the choice of a sugar cone, waffle cone or cup. If a person orders two scoops of different flavor ice cream, how many possible orders are there, if you do not care about the order of flavors? I don't

*asked on October 1, 2016* -
## Math

Sean has $75 to spend on CDs. If each CD costs $6.98, about how many CDs can he buy?

*asked on April 6, 2017* -
## math

A certain diet requires no more than 60 units of carbohydrates, at least 45 units of protein, and at least 30 units of fat each day. Each ounce of Supplement A provides 5 units of carbs, 3 units of protein, and 4 units of fat. Each ounce of Supplement B

*asked on September 25, 2006* -
## Chemistry

What mass of solid potassium sulfate, K2SO4, is used to make up exactly 100.0cm^3 of 0.100 mol/dm^3 SO4^2-? This should be a very easy, 1-mark question but for some reason I can't wrap my head around it. moles = mass/Mr, so all you gotta do is moles x

*asked on October 31, 2018* -
## Chemistry

Ethanoic acid can be reacted with alcohols to form esters, an equilibrium mixture being formed. CH3CO2H + ROH CH3CO2R + H2O The reaction is usually carried out in the presence of an acid catalyst. In an experiment to determine Kc a student placed together

*asked on April 4, 2018* -
## Math

If 8x + 8y = 18 and x^2 – y^2 = –3/8, what is the value of 2x – 2y? The answer is supposed to be -1/3 but I have no idea how to get that. Thanks in advance for helping out!

*asked on June 20, 2018* -
## physics

once a 21 kg crate is in motion on a hoizontal floor, a horizontal force of 58 N keeps the crate moving with a constant velocity. the acceleration of gravity is 9.81 m/s^2. what is mu k , the coefficient of kinetic friction, between the crate and the

*asked on November 11, 2010* -
## Math - Vectors

Relative to an origin O, the position vectors of points A and B are given by OA = 3pi + 4j + p^2k, and OB = -pi + -1j + p^2k Find the values of p for which angle AOB is 90° So here's my work so far: If angle = 90° then OA.OB = 0 OA.OB = p^4 - 3p^2 - 4

*asked on December 5, 2017* -
## Chemistry

How would you write an ionic equation for: NH2SO3H + NaOH —> NaNH2SO3 + H2O? Is it simply H+ + OH- —> H2O?

*asked on October 9, 2017* -
## Math

Each letter in the subtraction problem below represents a different digit from 0 through 9.The digits 3 and 5 don't apear. replace each letter so the subtraction problem is true. GRAPE - PLUM =APPLE

*asked on January 23, 2011* -
## Math

The chart below shows the population distribution for the 2,400 occupants of the city of Centre Hill. Adult Male Adult Female Child % Living in Uptown 9 8 6 % Living in Midtown 22 20 15 % Living in Downtown 21 22 12 % Living in Suburbs 48 50 67 If there

*asked on June 21, 2018* -
## 8th grade math

Convert 3.16x10^3 in standard form

*asked on October 26, 2017* -
## E.L.A

Three centuries of tension between the plebs and patricians led to the __________.

*asked on June 15, 2016* -
## math

Five people share these four candy bars . what fraction does each share?

*asked on April 4, 2015* -
## Math

Prove the identity cos3x ≡ 4cos^3x - 3cosx Thank you so much for the help!

*asked on December 6, 2018* -
## Chemistry

Back with another question similar to the one I asked before, but this one's a bit more confusing 4NH3 (g) + 5O2(g) → 4NO(g) + 6H2O(g) ∆H= –909 kJ/mol 2NO(g) + O2(g) → 2NO2(g) ∆H= –115 kJ/mol 3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g) ∆H = –117

*asked on October 24, 2017* -
## Chemistry

Use the information below to answer this question C(s) + O2(g) -> CO2(g) ΔH = -394 kJ/mol H2(g) + 1/2 O2(g) -> H2O(l) ΔH = -286 kJ/mol 4C(s) + 5H2(g) -> C4H10 (g) ΔH = -126 kJ/mol The standard enthalpy of combustion of butane, in kJ/mol, is: A -2880 B

*asked on October 24, 2017* -
## Math - Probability

Reposting again since my previous question may seem like it's been answered. If I shouldn't do this just let me know :) The probability that an event A occurs is P(A) = 0.3 . The event B is independent of A, and P(B) = 0.4 . Calculate P(A or B or both

*asked on November 6, 2018* -
## Math

How do I go about proving that: cos(4θ) + 4cos(2θ) ≡ 8cos^4(θ) - 3 Thanks in advance!

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

Sorry if this is a lot of questions but What do you hear when you hear the word math? What do you believe when you hear the word math? What do you think when you hear the word math?

*asked on September 2, 2014* -
## Math

Solve the equation 2cos2x = √3 for 0°≤x≤360° I did this: cos2x = √3 /2 2x=30 x=15 x=15, 165, 195, 345 Is this correct? Solve the equation √3 sin2x + cos2x = 0 for -π≤x≤π No idea how to approach this one Thanks a bunch for the help!

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

Anais bought 4.5 yards of ribbon. She had 3 feet 8 inches of ribbon left after trimming some curtains. How many inches of ribbon did Anais use to trim the curtains?

*asked on April 13, 2017* -
## math

A recipe for 1batch of muffins included 2/3 cup of raisins.Ina made 2 and 1/2 batches of muffins.how many cups of raisins did she use

*asked on April 4, 2015* -
## Chemistry

Back again with another problem :) How do you calculate the enthalpy change, in kJ/mol for the reaction of copper(II) sulfate? 0.0210 mol of copper sulfate was added to 25 cm3 of water. The temperature increased by 14°C. The specific heat capacity of

*asked on October 24, 2017* -
## Math

The altitude of a plane as it begins to descend is shown by the linear equation a = 22,000 – 800m, where a is the plane’s altitude, in feet, and m is minutes. What is the plane’s altitude when m = 12? ft

*asked on December 13, 2014* -
## Science

What is the difference between p-waves, s-waves, and surface waves? Which do the most damage? Please and thank you!

*asked on November 14, 2007* -
## math

There was a sidewalk sale at Mega Mall. Everything was marked down by30%. Rodrick bought 3 pairs of jeans originally priced at $29.95 each,a shirt originally priced at $18.50 and a pair of sandals originally priced at $32.29. The sales tax in Roderick's

*asked on December 16, 2014* -
## geometry

P, Q, and S are collinear and the measure of PQR = 120°. What does the measure of SQT have to equal to ensure that R, Q, and T are collinear?

*asked on October 2, 2010* -
## History

Many people believe that the Civil War is considered to be the worst war in American history. What is the basis for this belief and do you agree or disagree with this statement?

*asked on November 30, 2016* -
## math

Grandpa has twenty - four coins in his pocket . grandpa gives Sam some clues the total value of the coins in his pocket one - sixth of coins are quarters , one - half of coins in dimes . what is the total value of the coins in grandpa 's pocket that Sam

*asked on May 4, 2015* -
## Math

The first three terms of an arithmetic progression are 2x, x+4 and 2x+7 respectively. Find the value of x. I have no idea where to go from here – any help would be greatly appreciated, thanks in advance!

*asked on March 19, 2018* -
## math

Brenden read 3/4 of a book that was 7/8 inch thick . how much of the book , in inches , did he read ?

*asked on April 4, 2015* -
## physics

The fastest recorded pitch in the MLB was thrown by Nolan Ryan in 1974. If this pitch were thrown horizontally, the ball would falll .809m (2.65 ft) by the time it reached home plate, 18.3 m away (60 ft). The acceleration of gravity is 9.81 m/s^2. How fast

*asked on October 25, 2010* -
## physics.

During a baseball game, a batter hits a pop-up to a fielder 94 m away. The acceleration of grvity is 9.8 m/s^2. If the ball remains in the air for 5.5 seconds, how high does it rise? Answer in units of m.

*asked on October 25, 2010* -
## physics.

Part 1: A ball is thrown horizontally from the top of a building 28.6 m high. The ball strikes the ground at a point 80.3 m from the base of the building. The acceleration of gravity is 9.8 m/s^2. Find the time the ball is in motion. Answer in units of s.

*asked on October 25, 2010* -
## 9th grade

kyle just started a new job that pays $7 per hour. He had been making $5 per hour at his old job. Kyle worked a total of 54 hours last month and made $388 before deductions. How many hours did he work at his new job?

*asked on May 23, 2010* -
## statistics

A company manufactures caclculators in batchers of 64 and there is a 5% rate of defects. Find the probability of getting exactly three defects in a batch

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

Describe the delegates who attended the Constitutional Convention.

*asked on November 26, 2007* -
## History

How did the Federalists and the Antifederalists try to convince people to take their side in the debate over the Constitution?

*asked on November 14, 2007* -
## Chemistry

A pretty confusing question with weird wording: If the concentration of a compound is 10mg/ml, and its molecular weight is 267.24, how would you make 10 ml, with the compound at 10 µM?

*asked on July 9, 2018* -
## Math/Physics

How would you solve this? 1/2 mv^2 - 1/2 m x 25 = mg x 100sin20 I obtained this from the question: A girl on a sledge starts, with a speed of 5 m/s, at the top of a slope of length 100 m which is at an angle of 20 degrees to the horizontal. The sledge

*asked on January 16, 2018* -
## Math

6sin(2x)+3=0 How do you find the smallest value of x in the interval 0≤x≤π for which y=0? My work so far: 6sin(2x)=-3 sin(2x)=-1/2 The answer should be 7π/12, or 1.83 Thanks in advance!

*asked on October 18, 2017* -
## Anatomy

What is Oxytocin? Is this positive or negative feedback?

*asked on November 17, 2016* -
## Anatomy

What does the term "homeostasis" mean? What is one of the mechanisms used by our bodies to maintain homeostasis?

*asked on November 17, 2016* -
## Science

Which of the following tools can bd used to measure mass? A) a graduated cylinder B) a triple beam balance C) a mercury thermometer D) a bathroom scale I think its B, thank you for the help!

*asked on September 15, 2016* -
## Chemistry

When its brakes are applied, a car moving at 10 m/s undergoes an acceleration of -1.2 m/s2. How far does the car travel before it comes to a stop?

*asked on January 15, 2016* -
## math

Wayne filled 5 glasses with 2/3 liter of soda in each glass. How much soda did Wayne use?

*asked on May 13, 2015* -
## math

Of 25 students who took a test in math , only 5 received A's .what fraction of the class received an A on the test? Write your answer in simplest form.

*asked on April 4, 2015* -
## Math

The digit in the hundreds place is a square number, and it is odd. The digit in the tens place is 1 more than the square root of 16. The digit in the hundredths place is 0.1 larger than 1/10 of the digit in the hundreds place. The digit in the thousands

*asked on May 2, 2013* -
## English

14. Why is “The Divine Comedy” an allegory? Everyone dies in the end. The theme is ambiguous. All of the characters and settings are symbolic. The poem teaches a lesson about good and evil. 15. In “The Love Song of J. Alfred Prufrock,” what mood is

*asked on December 18, 2012* -
## english

what is the helping verb in we will attend the party if we finish our chores in time.

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

Talking about significant figures, my Physics textbook lists 5 rules for determining significant figures. 1) All nonzero digits are significant. 2) Zeros to the right of nonzero digits in a number containing a decimal point are significant. 4) Zeros to the

*asked on August 21, 2012* -
## physics.

The fastest recorded pitch in the MLB was thrown by Nolan Ryan in 1974. If this pitch were thrown horizontally, the ball would falll .809m (2.65 ft) by the time it reached home plate, 18.3 m away (60 ft). The acceleration of gravity is 9.81 m/s^2. How fast

*asked on October 25, 2010* -
## social studies

Who were some of the French explorers who came to North America?

*asked on April 20, 2010* -
## Math/Physics

A car of mass 0.9 tonnes is driven 200 m up a slope inclined at 5° to the horizontal. There is a resistance force of 100 N. (i) Find the work done by the car against gravity. (ii) Find the work done against the resistance force. (iii) If the car slows

*asked on January 8, 2018* -
## Pre-Algibra

Find the radius of a cone with a height of 14 cm and a volume of 718.4 〖cm〗^3, use 3.14 for X and remember to show all work

*asked on February 1, 2016* -
## Physics

While playing lawn darts with his friend, Jack notices that when he throws a dart up at 60 degrees it travels 11 meters. How high did the dart travel

*asked on October 7, 2015* -
## math

how do i solve this linear system using substitution or elimination -16x+2y= -2 y=8x-1

*asked on December 5, 2012* -
## Counseling

Hello, I need help with this question, What factors in today's culture hinder wives from pursuing the C-H-A-I-R-S approach to a relationship as in the book Love and Respect by Eggrich's. I was thinking employment and wives being powerful, thanks

*asked on September 30, 2011* -
## Macroeconomics

If GDP increases by 5 percent in the same that the deficit is run, What happens to gross debt as a percentage of GDP? What happens to the level of debt held by the public as a percentage of GDP? deficit was $300 billion

*asked on July 10, 2011* -
## Algebra II

How would I simplify the complex fraction: 3/x^3/1/x^2 ? Thanks

*asked on January 19, 2011* -
## physics

Part 1: A long jumper leaves theground at an angle of 21.7 degrees to the horizontal and at a speed of 10.6 m/s. The acceleration of gravity is 9.8 m/s^2. How far does he jump? Answer in units of m. Part 2: What is the maximum height he reaches? Answer in

*asked on October 25, 2010* -
## world history

Did Islam become more less influential in West Africa from the 700s to the 1400s?

*asked on September 21, 2010* -
## psychology

need help analyzing hoe neuro processes effect behavior and impact the field of biological psychology. just need some help understanding this question please....

*asked on August 2, 2010* -
## statistics

A company manufactures caclculators in batchers of 64 and there is a 5% rate of defects. Find the probability of getting exactly three defects in a batch

*asked on April 26, 2010* -
## Financial Accounting

Brenda starts a merchanding business on December 1 and enters into three invfentory purchases: December 7 10 units @&6 cost December 14 20 units @12 cost December 21 15 units @ 14 cost Brenda sells 15 units for 25.00 each on Dec 15. Eight of the sold units

*asked on April 2, 2009* -
## algebra

Write each equation in standard form (set equal to zero). Then solve by factoring. Example: x²-2x=8

*asked on May 15, 2008* -
## Algebra

One newspaper reported that the mayor received a salary increase of 5%. Another paper reported that the mayor's salary went up $2000. What was the mayor's salary before the increase? My teacher gave us a hint. y= 1.05x.

*asked on April 24, 2008* -
## language arts

what are simple subjects ang simple predicates help me work due monday The simple subject is the one word that is doing the action. The simple subject in these examples are CAPITALIZED. LASSIE came home. ONE of my brothers plays football. Have YOU ever

*asked on August 13, 2005* -
## Math

If x - y = 9, find the maximum value of xy^2 Never seen this type of question before, any help? Thanks!

*asked on November 16, 2017* -
## Math

How do you write 200 7/100 as a decimal?!?

*asked on April 13, 2016* -
## math

Tony deposited $3000 into a savings account that pays him interest at a rate of 3%. How much interest will Tony earn in 5 years?

*asked on February 24, 2016* -
## math

Kevin uses 1 1/4 cups of milk to make 1 cake . what is the total amount of milk Kevin needs to make 6 of these cakes ?

*asked on May 1, 2015* -
## Algebra

In 1920, the record for a race was 46.9 seconds. In 1940 it was 46.5 seconds. Let R(t)= the record in the race and t= the number of years since 1920. a) Find a linear function that fits data. b)Predict the records for 2003 and 2006. c) Year when record

*asked on February 28, 2012* -
## 7th grade

What are the two vegetation types of Ethiopian Highlands?

*asked on December 15, 2010* -
## physics

Let's pretend the Qs are actual numbers. So an unstretched, mass less spring constant Q3 N/m and length Q10 meters is attached between a wall and a mass of Q5 kg. The coefficient of both static and kinetic friction between the mass and the table is Q13. A

*asked on December 2, 2009* -
## Physics

a car travels 59.78 miles east in 89.67 minutes, then 89.67 miles north in 59.78 minutes, and then 29.89 miles at 59.78 degrees west of south in 149.45 minutes. whats the magnitude of the car's average velocity in miles per hour??? Please help!!!!!! P.S.

*asked on September 7, 2009* -
## Science

What is El Nino?

*asked on September 26, 2007* -
## Chemistry

Which reaction would occur more readily? Why? 1) Mg + Cl2 --> MgCl2 2) 2Mg + O2 --> MgO Thanks!

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

How would you differentiate this equation? 1/6(2x-3)^3 -4x Here's my working u = 2x-3 y = 1/6u^3 dy/du = 1/2u^2 du/dx = 2 dy/dx = dy/du x du/dx = (2x-3)^2 -4 Is this correct? Thanks for checking!

*asked on November 9, 2017* -
## math

Jayden had some items to store in a storage unit that was 10 feet long , 8 feet wide , and 10 feet high. What is the volume of the storage unit ?

*asked on April 4, 2015* -
## math

Twenty -five students in a class were selling pizzas door to door in a community of 500.if the town was divided evenly among the students , how many did each student visit?

*asked on April 4, 2015* -
## Algebra

Simplify. Write the answer using positive exponents only. (x^-5y^-6/a^-5)^-3

*asked on March 27, 2015* -
## math

2y-3(-2y-4y+5)

*asked on February 24, 2015* -
## algebra

Sam downloaded four applications for $2.99 each to her cell phone. The remaining applications that Sam purchased cost $1.99 each. If she downloaded x total applications, which of the following equations can be used to find how much Sam spent on cell phone

*asked on March 1, 2014* -
## Chemistry

The pH of vinegar is 2.40. Calculate the concentration of hydronium ions and hyrdroxide ions in vinegar.

*asked on April 11, 2012* -
## Chemistry

The pH of vinegar is 2.40. Calculate the concentration of hydronium ions and hyrdroxide ions in vinegar.

*asked on April 11, 2012* -
## physics

My question is what would be the constant in a basketball ofensive rebound experiment? My science q is do the amount of offensive rebounds decide whether or not a basketball will win or loose the game? can you help/

*asked on October 26, 2011* -
## physics

Part 1: A ball is thrown horizontally from the top of a building 28.6 m high. The ball strikes the ground at a point 80.3 m from the base of the building. The acceleration of gravity is 9.8 m/s^2. Find the time the ball is in motion. Answer in units of s.

*asked on October 25, 2010*

## Pages

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