Posts by Annie
Total # Posts: 897

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 ... 
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? 
Math
Find the first five terms of the sequence using the recursive rule: a1 = 2/3, and An = 5a N1 
Chemistry
A 30.0ml 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? 
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 1.0 103 M FeSO4. 
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? 
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 ... 
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... 
math
5 radical 3 
math
Express 4 radical 75 
math
thanks 
math
The bases on a baseball diamond are 90 feet apart. How far is it from home plate to second base? Please explain 
Chemistry
The pH of a 1 .00 x 102 M solution of cyanic acid(HOCN) is 2.77 at 25 degrees. Calculate Ka and pKa for HOCN from this result. 
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. 
Chemistry
Thank you so much 
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 ... 
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. 
Math
6 and8 
Math
yes thanks 
Math
sorry 
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. 
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... 
Math
solve for x in the interval [0,2π): 3csc^2(5x)=4 
math
For a fundrasier, the Best Buddies club sold tshirts. 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 ... 
Physics
A 0.03kg bullet is fired vertically at 200m/s into a 0.15kg 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... 
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 
Math
15 😝 
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 
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? 
chemistry
calculate the # of moles of oxygen in 2 L @ 24 deg C & 750 torr 
Chemistry
# of moles of oxygen in 2 L @ 24 deg C & 750 torr? 
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 
chemchemchem
thad do you know how to do #13? 
chemchemchem
yes! thank you it worked! 
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 ... 
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 ... 
science/evolution
what exactly is the unity of life? 
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? 
biology
what is the importance of islands in the study of evolution? 
Stat
Please help with this problem, not sure calculate it. Consider the standard normal distribution and find P(1.5 < Z < 2.35). 
Math
49 bishhh 
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) ... 
Physics
a 254kg crate is pushed horizontally with a force of 740 N. if the coefficient of friction is .20, calculate the acceleration of the crate 
Geometry
it is not a right triangle. the easiest way i determine is if they are factors of 3,4 and 5 
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? 
Physics
A 50kg 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) 
algebra
Does 6+5x=44 
math help pls
yess Nashi is right 
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? 
Chemistry
Thankyou so much for all the help and the explanation and your time. 
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. 
Chemistry
yes dt is delta T and i think it is the specific heat capacity of NaCl but im not sure 
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 ... 
Chemistry
50 mL of 2.00 M HCl and 50 ml of 2.05 M NaOH were used 
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. 
Math for Steve or someone good at math
This is what the answers actually are: B D A D B If you actually look at the last question, it makes sense that it is B and not D because it doesn't increase by 105. 
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 ... 
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 ... 
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 ... 
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 ... 
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. 
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. 
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. 
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? 
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 . 
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 ... 
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 ... 
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 
Math
What is the doubling time of prices which are increasing by 5 percent per year? 
Precalculus
What is the doubling time of prices which are increasing by 5 percent per year? 
Math
The halflife of radioactive strontium90 is approximately 32 years. In 1961, radioactive strontium90 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... 
Physics
12 
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 
precalc
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 
economics
Suppose that when a firm increases output by 20%, longrun total cost increases by 50%. The firm will experience 
health
Whats the answer? 
Math
What scenic structures are featured in chapter 2 Problem Solving on Location? 
health
hey .... if its wrong why don't you put the answer !!! 
math
x> 2 
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? 
government
The first American voters were only white, male s 
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 ... 
calculus
Please help! ∫17dx/x^2(sqrt(x^2+49)) .. let x=7tan(θ). thank you so much for your help! 
math
the gerund phrase is: studying calculus for the noun function I put: predicate noun, correct? 
essay
what are some some similarities and differences between dawn and night by elie wiesel? 
Reading comprehension
False 
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 
Reading comprehension
False 
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 
Reading comprehension
@Ms Sue I copied the statement wrong it is The blue fish is not as long as the red fish 
Reading comprehension
Ms Sue did u see my answer 
Reading comprehension
I think the answer is false because not as long means that the red fish is longer 
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 
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 
Reading
I need to know if the statement is true or false 
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 
Math
What is 0.5 to the tenth power, as a fraction? a.k.a. 0.0009765625 as a fraction 
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"? 
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 
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