Monday

March 2, 2015

March 2, 2015

Total # Posts: 687

**math**

@steve Why is the base of the box 16-2x by 10-2x (where did the 2x come from?)
*March 27, 2013*

**math**

An open box is made from a rectangular piece of cardboard measuring 16 cm by 10cm. Four equal squares are to be cut from each corner and flaps folded up. Find the length of the side of the square which makes the volume of the box as large as possible. Find the largest volume
*March 27, 2013*

**Chemistry**

20 ml of 0.1 M acetic acid was mixed with 25 ml of 0.1 M Sodium Acetate. The pH was measured to be 4.43. 5 ml of 0.1 M Sodium Hydroxide was added to the buffer and the pH was measured to be 4.60. Calculate the pH of the buffer before and after the addition of NaOH.
*March 25, 2013*

**Chemistry**

1 g of acid was mixed with 120 ml of distilled water and the solution was filtered into a clean dry beaker. A 25 ml aliquot of this solution was titrated with 0.1120 M NaOH. The pH of the acid was recorded to be 4.42. Calculate the initial concentration of the weak acid and ...
*March 25, 2013*

**Math**

A gasoline tank contains 500 liters of gasoline. By the end of each day, 70% of the gasoline remains. When will there be less than 100 liters in the tank?
*March 20, 2013*

**Math**

Find the first five terms of the sequence using the recursive rule: a1 = 2/3, and An = 5a N-1
*March 20, 2013*

**Chemistry**

A 30.0-ml sample of 0.165 M propanoic acid is titrated with 0.300 M KOH. What is the pH at 5 ml of added base, at 10 ml of added base?
*March 19, 2013*

**chemistry**

Calculate whether or not a precipitate will form if 1.40 mL of 0.62 M NH3 are added to 4.4 L of 1.0 10-3 M FeSO4.
*March 19, 2013*

**11**

A ball is dropped vertically from height of 30 meters after bounces.The ball reaches a max height to 60% of height of the previous bounce. What are the terms of the sequence. What is the height to the nearest tenth of a meter of the ball after the tenth bounces?
*March 18, 2013*

**Management Science**

Riverside oil company in eastern Kentucky produces 3 different grades of gasoline. They are regular, premium, and supreme grades. Each barrel of regular grade sells for $82 while premium grade sells for $88 per barrel and supreme grade sells for $89 per barrel. Petroleum ...
*March 18, 2013*

**Physics**

A roller coaster cart travelling due north at 20m/s that turns left during an interval of 4.0s without changing speed. Find the average acceleration. I understand the mathematics behind it (using pythagoras's theorem to find velocity and the formula acceleration = velocity...
*March 17, 2013*

**math**

5 radical 3
*March 15, 2013*

**math**

Express 4 radical 75
*March 15, 2013*

**math**

thanks
*March 12, 2013*

**math **

The bases on a baseball diamond are 90 feet apart. How far is it from home plate to second base? Please explain
*March 12, 2013*

**Chemistry**

The pH of a 1 .00 x 10-2 M solution of cyanic acid(HOCN) is 2.77 at 25 degrees. Calculate Ka and pKa for HOCN from this result.
*March 11, 2013*

**MATH **

A ladder is 25 ft long. The ladder needs to reach to a window that is 24 ft above the ground. How far away from the building should the bottom of the ladder be placed? Please show work.
*March 11, 2013*

**Chemistry**

Thank you so much
*March 11, 2013*

**Chemistry**

Iodine is mainly found in water in the trioxide ion, I3 which is formed by the combination of molecular iodine, I2 and Iodide, I-, according to the equation: I2(aq) +I-(aq) <----> I3(aq) QUESTION: how does the system in the equilibrium seem to respond to the changes ...
*March 11, 2013*

**Ms. Sue Please HELP**

Adam is 5 years younger than Eve. In 1 year, Eve will be three times as old as Adam was 4 years ago. Find their ages now.
*March 5, 2013*

**Math**

6 and8
*March 5, 2013*

**Math**

yes thanks
*March 5, 2013*

**Math**

sorry
*March 5, 2013*

**Math **

Barry is 8 years older than his sister. In 3 years, he will be twice as old as she will be then. How old is each now? Please show work! I don't understand.
*March 5, 2013*

**American Goverment**

What European country was England's primary rival in North America? In which colonies did the citizens have the most power over their own affairs? About how long after the conflict between Britain and the colonies broke into open warfare was the Declaration of Independence...
*March 1, 2013*

**Math**

solve for x in the interval [0,2π): 3csc^2(5x)=-4
*February 28, 2013*

**math**

For a fundrasier, the Best Buddies club sold t-shirts. The adult shirts were $15 per shirt and the youth shirts were $12 per shirt, and they made a total of $330 on the shirts. If they sold a total of 26 shirts, how many of each did they sell? I don't understand this, so ...
*February 27, 2013*

**Physics**

A 0.03-kg bullet is fired vertically at 200m/s into a 0.15-kg baseball that is initially at rest. The bullet lodges in the baseball and, after the collision, the baseball/bullet rise to a height of 37m. (a). What was the speed of the baseball/bullet right after the collision...
*February 14, 2013*

**Math **

At a concession stand, popcorn costs $1.10 and nachos cost $2.35. One day, the receipts for a total of 172 popcorn and nachos were $294.20. How many popcorns were sold. Please show work! I don't understand
*February 6, 2013*

**Chemistry**

calculate the enthalpy change for: (enthalpy of formation of aqueous sodium hydroxide is -469.60 kJ/mol. enthalpy of formation of liquid water is -285.8 kJ/mol) 2Na + 2H2O = 2 NaOH + H2
*January 31, 2013*

**chemistry**

a weather balloon partially filled w/ 33.5 L of helium @ 18 deg C & .95 atm. what volume will helium occupy @ -23 deg C w/ a pressure of 3 x 10 to the -3 atm?
*January 29, 2013*

**chemistry**

calculate the # of moles of oxygen in 2 L @ 24 deg C & 750 torr
*January 29, 2013*

**Chemistry**

# of moles of oxygen in 2 L @ 24 deg C & 750 torr?
*January 28, 2013*

**chem hwk help!**

Given the following reaction: 3 CaCl2 + 2 H3PO4 Ca3(PO4)2 + 6 HCl How many grams of H3PO4 are needed to react completely with 1.837 g of CaCl2? I don't understand at all
*January 25, 2013*

**chemchemchem**

thad do you know how to do #13?
*January 25, 2013*

**chemchemchem**

yes! thank you it worked!
*January 25, 2013*

**ALGEBRA 1 PLEASE HELP! I DONT UNDERSTAND**

In basketball you score 2 points for a field goal and 1 point for a free throw. Suppose that you have scored at least 3 points in every game this season, and have a season high score of 15 points in one game. How many field goals and free throws could you have made in any one ...
*January 20, 2013*

**math (algerba 1) Please help! **

In basketball you score 2 points for a field goal and 1 point for a free throw. Suppose that you have scored at least 3 points in every game this season, and have a season high score of 15 points in one game. How many field goals and free throws could you have made in any one ...
*January 18, 2013*

**science/evolution **

what exactly is the unity of life?
*January 18, 2013*

**science **

what is the unity of life? if asked to explain two examples could it be a human and a chimp or would the two examples be DNA and RNA?
*January 16, 2013*

**biology **

what is the importance of islands in the study of evolution?
*January 14, 2013*

**Stat**

Please help with this problem, not sure calculate it. Consider the standard normal distribution and find P(-1.5 < Z < 2.35).
*December 14, 2012*

**Physics**

A kickoff sends a football with an initial velocity of 25 m/s at an angle of 50 degrees above the horizontal. a) find the x and y components of the velocity b) find the time the ball is in the air c) find the horizontal distance the ball travels before hitting the ground d) ...
*November 29, 2012*

**Physics**

a 254-kg crate is pushed horizontally with a force of 740 N. if the coefficient of friction is .20, calculate the acceleration of the crate
*November 29, 2012*

**Geometry**

it is not a right triangle. the easiest way i determine is if they are factors of 3,4 and 5
*November 29, 2012*

**chemistry**

The air exhaled by an average human being might have the following typical combustion, expressed in terms of partial pressures: N2 = 569torr; O2 = 116 torr; CO2 =28 torr; water vapor = 47 torr. what are the mole fractions of each?
*November 25, 2012*

**Physics**

A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4 106 m, mass = 6.0 1024 kg)
*November 18, 2012*

**algebra**

Does 6+5x=44
*November 16, 2012*

**Chemistry**

I have one more question, why is the volume of NaCl 0.05 L when we are calculating the mols and 0.1 L when we are calculating mass?
*November 12, 2012*

**Chemistry**

Thankyou so much for all the help and the explanation and your time.
*November 12, 2012*

**Chemistry**

Originally the enthalpy is negative then how does it become postive and I have followed the steps and I came up 47.36 J/g degrees C. Also I don't understand why enthalpy is q if you could please explain that, and thankyou so much.
*November 12, 2012*

**Chemistry**

yes dt is delta T and i think it is the specific heat capacity of NaCl but im not sure
*November 12, 2012*

**Chemistry**

Naoh (aq) + HCl (aq) --> NaCl (aq) + H2O (l) Using the dT determined in part 1, calculate the heat capacity of the calorimeter. Enthalpy of reaction= -58.3 kj/mol, Cs (NaCl = 3.91j/g C)density of 1 M NaCl = 1.037g/mL. dT= 12.88 degrees Celcius.50 mL of 2.00 M HCl and 50 ml ...
*November 12, 2012*

**Chemistry**

50 mL of 2.00 M HCl and 50 ml of 2.05 M NaOH were used
*November 12, 2012*

**Chemistry **

Naoh (aq) + HCl (aq) --> NaCl (aq) + H2O (l) Using the dT determined in part 1, calculate the heat capacity of the calorimeter. Enthalpy of reaction= -58.3 kj/mol, Cs (NaCl = 3.91j/g C)density of 1 M NaCl = 1.037g/mL. dT= 12.88 degrees Celcius.
*November 12, 2012*

**Physics**

Consider a stainless steel annular disk with an outer radius 68mm and inner radius7.4mm. The mass of the disk is 1349 grams. The stainless steel annular disk is allowed to rotate on a frictionless table with the rotation axis at its center. The disk has a small cylinder ...
*October 30, 2012*

**Physics**

Consider a stainless steel annular disk with an outer radius 68mm and inner radius7.4mm. The mass of the disk is 1349 grams. The stainless steel annular disk is allowed to rotate on a frictionless table with the rotation axis at its center. The disk has a small cylinder ...
*October 30, 2012*

**Chemistry**

A sample of the compound prepared in this experiment, weighing .1021g, is dissolved in HNO3 and diluted to a volume of 100mL. A 10mL aliquot of that solution is mixed with 10mL 6 M NH3. The [Cu(NH3)4 2+] in the resulting solution is 5.16x10^-3 M. How many moles of Cu were in ...
*October 23, 2012*

**Physics**

The drawing shows a jet engine suspended beneath the wing of an airplane. The weight W of the engine is 12000 N and acts as shown in the drawing. In flight the engine produces a thrust T of 54200 N that is parallel to the ground. The rotational axis in the drawing is ...
*October 21, 2012*

**Math**

How many integers bewteen 200 and 500 inclusive leave a remainder 1 when divided by 7 and a remainder 3 when divided by 4? Find the smallest positive integer that leaves a remainder 5 when divided by 7, a remainder 6 when divided by 11, and a remainder 4 when divided by 13.
*October 13, 2012*

**Math**

Which Statements of congruence are true and which are false and why? 177 _= 17 871 _= 713 1322 _= 5294 5141 _= 8353 13944 _= 8919 67 x 73 _= 1 x 3 17 x 18 x 19 x 20 _= 4! 83 (144 power) _= 15 (144 power) Their not equals signs...they are three lines on top of one another.
*October 13, 2012*

**Stoichiometry**

A gas mixture at 27 C and 750 torr contains acetone vapor with 70% saturation. Calculate the temperature to which the gas must be cooled, at constant pressure to condense 40% of the acetone.
*October 10, 2012*

**Math**

Sue drives 36 miles to the fair. Every 4 miles, she sees a sign to the fair. . How many signs will she see on her trip in all?
*September 27, 2012*

**Chemistry**

calculate the volume of a rectangular prism with a length of 5.6 , a width of 2.1 , and a height of 6.6 .
*September 27, 2012*

**Chemistry**

Suppose you are asked to find the area of a rectangle that is 2.1- wide by 5.6- long. Your calculator answer would be 11.76 . Now suppose you are asked to enter the answer to two significant figures. (Note that if you do not round your answer to two significant figures, your ...
*September 27, 2012*

**Physics**

In a World Cup soccer match, Juan is running due north toward the goal with a speed of 7.70 relative to the ground. A teammate passes the ball to him. The ball has a speed of 13.3 and is moving in a direction of 30.5 east of north, relative to the ground. a) what is the ...
*September 25, 2012*

**math**

Every year there is a race to the top of the empire state building. In 1993 the winner got to the top in 10 minutes, 18 seconds. how many stairs did the winner go up per second, rounded to the nearest whole number
*September 20, 2012*

**Math**

What is the doubling time of prices which are increasing by 5 percent per year?
*September 19, 2012*

**Precalculus **

What is the doubling time of prices which are increasing by 5 percent per year?
*September 19, 2012*

**Math**

The half-life of radioactive strontium-90 is approximately 32 years. In 1961, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 8 percent of the original...
*September 19, 2012*

**math**

Show that f and g are inverse functions algebraically. f(x)=x^3/2 g(x)=3 cuberoot 2x My work so far: (3sqrt2x)^3 ------------ 2 I need help on the numeral part of the expression
*September 11, 2012*

**pre-calc**

Show that f and g are inverse functions algebraically. f(x)=x^3/2 g(x)=3 cuberoot 2x My work so far: (3sqrt2x)^3 ------------ 2 I need help on the numeral part of the expression
*September 11, 2012*

**economics**

Suppose that when a firm increases output by 20%, long-run total cost increases by 50%. The firm will experience
*August 19, 2012*

**health**

Whats the answer?
*August 11, 2012*

**Math**

What scenic structures are featured in chapter 2 Problem Solving on Location?
*August 1, 2012*

**health**

hey .... if its wrong why dont you put the answer !!!
*August 1, 2012*

**math**

x> 2
*July 19, 2012*

**Organic Chemistry**

a) What would be the product formed if diphenylacetylene were reacted with aqueous sulfuric acid? b) What would be the product formed if diphenylacetylene were reacted with two equivalents of HBR?
*July 14, 2012*

**government**

The first American voters were only white, male ---------s
*July 5, 2012*

**statistics**

A particular report included the following table classifying 711 fatal bicycle accidents according to time of day the accident occurred. Time of Day Number of Accidents Midnight to 3 a.m. 38 3 a.m. to 6 a.m. 29 6 a.m. to 9 a.m. 64 9 a.m. to Noon 78 Noon to 3 p.m. 98 3 p.m. to ...
*June 28, 2012*

**calculus**

Please help! ∫17dx/x^2(sqrt(x^2+49)) .. let x=7tan(θ). thank you so much for your help!
*June 6, 2012*

**math**

the gerund phrase is: studying calculus for the noun function I put: predicate noun, correct?
*May 22, 2012*

**essay**

what are some some similarities and differences between dawn and night by elie wiesel?
*May 17, 2012*

**Reading comprehension**

False
*May 9, 2012*

**Reading comprehension**

Reading - Annie, Tuesday, May 8, 2012 at 9:56pm The fish sizes r on a graph Blue fish. 70 feet Red fish. 45 feet Question true or false The blue fish is not as long as the red fish. True or false
*May 9, 2012*

**Reading comprehension**

False
*May 8, 2012*

**Reading comprehension **

Reading - Annie, Tuesday, May 8, 2012 at 9:56pm The fish sizes r on a graph Blue fish. 70 feet Red fish. 45 feet Question true or false The blue fish is not as long as the red fish. True or false
*May 8, 2012*

**Reading comprehension**

@Ms Sue I copied the statement wrong it is The blue fish is not as long as the red fish
*May 8, 2012*

**Reading comprehension**

Ms Sue did u see my answer
*May 8, 2012*

**Reading comprehension**

I think the answer is false because not as long means that the red fish is longer
*May 8, 2012*

**Reading comprehension**

Reading - Annie, Tuesday, May 8, 2012 at 9:56pm The fish sizes r on a graph Blue fish. 70 feet Red fish. 45 feet Question true or false The red fish is not as long as the blue fish. True or false
*May 8, 2012*

**Reading**

The fish sizes r on a graph Blue fish. 70 feet Red fish. 45 feet Question true or false The red fish is not as long as the blue fish. True or false
*May 8, 2012*

**Reading**

I need to know if the statement is true or false
*May 8, 2012*

**Reading**

If a blue fish is 70 ft long and a red fish is 45 feet long. This is statement true or false. A blue fish is not as long as a red fish
*May 8, 2012*

**Math**

What is 0.5 to the tenth power, as a fraction? a.k.a. 0.0009765625 as a fraction
*May 2, 2012*

**english**

In the book Roll of Thunder, Hear my Cry, what is the double meaning of Mr. Granger's words when he says he ain't gonna stand for no hanging on his place, and if y'all touch one hair on that boy's head, he's gonna hold every man responsible"?
*April 26, 2012*

**chemistry**

what is the volume at STP of a sample of CO2 that has a volume of 75.0 ML at 30c and 680 mm Hg
*April 26, 2012*

**chem**

a volume of 20. l of O2 os warmed from -30c to 85c what is the new volume if the pressure is kept constant
*April 24, 2012*

**geometry**

If m = 6.25 cm and n = 10 cm, what is the measure of angle ?
*April 16, 2012*

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