# Posts by Annie

Total # Posts: 877

**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 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 ...

**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...

**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 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

**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 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)

**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 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...

**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

**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

**economics**

Suppose that when a firm increases output by 20%, long-run 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

**geometry**

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

**Math**

Error Analysis: A friend says that the retail price of an item with a wholesale price of $80 is $100 after a markup of 125%. Describ and correct the error in the person's statement.

**English**

I read A partial rememberance of a puerto rican childhood. I'm suppose to be writing a essay but I need a thesis to do an outline.

**English**

Women is going crazy that a man doesn't care for her so it is driving her crazy. Men do harsh things like abusing their wife.

**English**

I am writing a paper and I was wondering does this sound like a good thesis? Cofer shows not only the crazyness women but also shows how men can be harsh.

**Chemistry PLEASE HELP!!**

energy from glucose is obtained from this equation when it is oxidized in the body C6H12O6 + 6O2 --> 6CO2 + 6H2O What is the catalyst in this equation?

**English**

isn't the question actually something like "You're walking home alone when you....." ??

**algebra 1b**

time= distance/speed Because the time used to travel is the same (regardless of the difference in distance) we can set the freight trains time equal to the passenger train's time. Let's start off with the freight train. The distance is 310. It says the speed is 18 mph ...

**physics**

A 6.5 g bullet leaves the muzzle of a rifle with a speed of 347 m/s. What total constant force is exerted on the bullet while it is traveling down the 0.83 m long barrel of the rifle?

**physics**

The sum of two forces, one having a magni- tude of 2 N acting due west and other having a magnitude of 8 N acting due north is?

**physics**

A blimp is traveling due North at 80km/hr with respect to the air, while the wind is blowing from northeast at 25km/hr with respect to the ground. What is the velocity of the blimp with respect to the ground? Thanks.

**Chemistry**

1) Prepare 100mL of 10%w/w HCl from 37%concentrated HCl(density of 37%HCl =1.19g/ml) 2) Prepare 100mL of 10%w/v HCl from 37% concentrated HCl(density of 37%HCl=1.19g/ml) Can you please show the calculation steps for 1) & 2)? Is 10%w/v HCl the same as 10%w/w HCl? Thanks.

**English - thank you ms sue i will wait**

i will wait and thanks a lot

**English - please help i had posted 3 times and no**

please can you make correction in my short story. i am very bad at grammar and even my parents does not khnow english well. can you proof reed my short story. Love-Hate story “Happy birthday Khushi”, her family said as they came to her room at midnight. “Thank ...

**eng lit**

please proof read my short story please and make some correction Love-Hate story “Happy birthday Khushi”, her family said as they came to her room at midnight. “Thank you, Mom, Dad and my lovely sister”, Khushi said with a huge smile. Khushi laid down on ...

**Chemistry**

Oh, sorry. 25 g of Zinc and 30 g of sulfur. I already found that Zinc is the limiting reagent, but I'm stuck on the rest.

**Chemistry**

Zinc and sulfur react to form zinc sulfide according to the equation Zn+S=>ZnS a) How many grams of ZnS will be formed? b) How many grams of the excess reactant will remain after the reaction is over?

**Physics help.**

If a curve with a radius of 94.5 m is perfectly banked for a car traveling 72.4 km/h, what must be the coefficient of static friction for a car not to skid when traveling at 96.4 km/h?

**Biology**

The genes for hair color and eye color are linked

**Math**

r=40-2t shows the relationship between the average rate of speed, r, of a car in meters per second, and the time, t,in seconds, as the car slows down.