Posts by john

Total # Posts: 8,532

Chemistry
For the reaction 2CO2(g) + 5H2(g)C2H2(g) + 4H2O(g) H° = 46.5 kJ and S° = -124.8 J/K The standard free energy change for the reaction of 1.75 moles of CO2(g) at 328 K, 1 atm would be ___ kJ This reaction is (reactant, product) ____ favored under standard conditions at ...

Physics, please help
Copper has a breaking stress of about 3 × 10^8 N/m2. What is the maximum load that can be hung from a copper wire of diameter 0.5 mm? Answer in units of N. If 55% of this maximum load is hung from the copper wire, by what percentage of its length will it stretch? Answer ...

Physics
Copper has a breaking stress of about 3 × 10^8 N/m2. What is the maximum load that can be hung from a copper wire of diameter 0.5 mm? Answer in units of N. If 55% of this maximum load is hung from the copper wire, by what percentage of its length will it stretch? Answer ...

algebra
in a relationship between variables, what is the variable called that changes in response to another variable? a. function b. input function c. independent variable d. dependent variable

Environmental Science
lol ms sue grow tf up

Science
How long will it take a shell fired from a cliff at an initial velocity of 800m/s at an angle 30 degrees below the horizontal to reach the ground 150m below?

calculus 1
Use Newton's method to find all solutions of the equation correct to six decimal places. (Enter your answers as a comma-separated list.) 6 cos(x) = x + 1 can somebody explain to me step by step on how to solve this problem?

calculus1
If C(x) = 13000 + 500x ? 3.2x2 + 0.004x3 is the cost function and p(x) = 2900 ? 8x is the demand function, find the production level that will maximize profit. (Hint: If the profit is maximized, then the marginal revenue equals the marginal

calculus 1
Find the limit. Use l'Hospital's Rule where appropriate. If there is a more elementary method, consider using it. lim x ? 0 (x?6x)/(6x ? 1)

Georgia State History
i dont know them

Georgia State History
Q14. Describe the fighting during the American Revolution in Georgia with the correct terms: The Battle of ______ ____________ ____________ started in 1776 when British soldiers arrived in ___________ to buy supplies. Governor __________________ took advantage of the arrival ...

AP Chem
A lab manual states that to prepare a certain buffer requires mixing 25 ml of 0.200 M HClO (Ka=3.00 x 10^-8) with 50 ml of 0.2 M NaClO What is the Ph of this buffer?

Math
That is what I am not sure about. Can someone please help me?

Math
In a group of 40 students, 22 study Economics, 25 study Law, and 3 study neither of these subjects. Determine the probability that a randomly chosen student studies: 1. Both Economics and Law 2. At Least one of these subjects 3. Economics given that he or she studies Law I ...

Math
In a group of 40 students, 22 study Economics, 25 study Law, and 3 study neither of these subjects. Determine the probability that a randomly chosen student studies: 1. Both Economics and Law 2. At Least one of these subjects 3. Economics given that he or she studies Law I ...

Math
In a group of 40 students, 22 study Economics, 25 study Law, and 3 study neither of these subjects. Determine the probability that a randomly chosen student studies: 1. Both Economics and Law 2. At Least one of these subjects 3. Economics given that he or she studies Law I ...

Math
Given P(A) = m is the probability of event A occurring in any given trial: 1. State the range of possible values of m 2. Suppose two trials are performed independently. Find, in terms of m, the probability of A occurring: a) Exactly once b) At least once I am very confused of ...

Trig
For which of the values of m do the graphs of functions y=x^2-mx+4 and y=x^2-19x+9 not intersect?

calculus1
Please help I want to post a picture but Jiskha doesn't allow me so I just describe what I see.the derivative tangent line curve start at (0,1/2). It curve downward pass the x-axis at (1,0)until it reach a local minimum at (2,-1)then it curve upward until it reach a local ...

math
write a two column proof. Given: RS=~ TS, V is the midpoint of RT Prove: /\RSV=~ /\TSV /\ is the triangle sign =~ is the congruent sign

Math
Write the equation of the line that satisfies the given conditions. Express the final equation in standard form. Contains the point (-8, 5) and is perpendicular to the line 2x ? y = 4

calcxulus1
Find the critical points of the function. (Enter your answers as a comma-separated list.) g(x) = square root(81 ? x^2)

calculus 1
Find the critical numbers of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) f(x) = 4x3 + x2 + 4x

Math, algebra
in a two by 3 grid, each lattice point is one unit from its nearest neighbours. a total of 14 isosceles triangles( but not right triangles), each with an area of 1\2 u2 have only two vertices that are one unit apart in the grid. how many such half unit triangles have at least ...

MATHS
ARITHMATIC PROGRESSION

Math
Three more than twice the smaller number is equal to the bigger number. If the sum of the numbers is 33, what is the smaller number?

Algerba 2
A football is kicked into the air. Its height in meters after t seconds is given by h=-5(t-2)^2+20 What was the height of the football when it was kicked? Is it right the y intercept is 0,0 and x intercept is (0,0) and (4,0)?

algebra
Write the equation of the line with slope m = 2 and passing through (8,20). Write your equation in the form y=mx+b y=

algebra
It takes Maggie 20 min to drive to work in the morning. She drives home using the same route, but it takes 13 min longer, and she averages 8 mi/h less than in the morning. How far does Maggie drive to work?

PreCalc
QP is (x y) = (3 -1) + r (14 10) QR is (x y) = (3 -1) + s (17 -9) PR is (x y) = (0 18) + t (5 -7) where r, s, and t are scalars. 1. Use vector methods to find the coordinates of P, Q, and R. 2. Find vectors PQ and PR and evaluate PQ*PR 3. Find size of QPR 4. Find the area of ...

PreCalc
QP is (x y) = (3 -1) + r (14 10) QR is (x y) = (3 -1) + s (17 -9) PR is (x y) = (0 18) + t (5 -7) where r, s, and t are scalars. 1. Use vector methods to find the coordinates of P, Q, and R. 2. Find vectors PQ and PR and evaluate PQ*PR 3. Find size of QPR 4. Find the area of ...

Chemistry
Can someone please help? How much total energy is emitted from a collection of 2.50 moles of H atoms if each atom is emitting a photon with a wavelength of 96.7 nm? I believe you must first use wavelength=plank constant/ mass of object times velocity, then use energy=plank ...

science
You probs mean 0.5 M. M= mol/L. Find the number of moles, convert to grams. Prepare grams in solution.

calculus
Differentiate the function.((x^2)-((3x^2)(ln(4x))))/(x^6)

Organic Chemistry Lab
Give all the products that you would expect by reaction of 2-bromo-3,4-dimethylbutane with methanol. Explain your answer. Thank you

Math
To travel 88 miles, it takes Sue, riding a moped, 4 hours less time than it takes Doreen to travel 72 miles riding a bicycle. Sue travels 13 miles per hour faster than Doreen. Find the times and rates of both girls. Doreen _ mph for _ hr Sue _ mph for _ hr

Math
Maria ate 1/3 of a pie. Her sister ate 1/5 of what was left. What fraction of the whole pie did her sister eat?

Chemistry
Re: Qualitative analysis - group 1 cations lab What single reagent could you add that would allow you to differentiate between the members of each pair of solid compounds below? Tell what happens to each substance when the reagent is added and show a balanced net ionic ...

Math
The combined area of a square and a rectangle is 124 square centimeters. The width of the rectangle is 4 centimeters more than the length of a side of the square, and the length of the rectangle is 2 centimeters more than its width. Find the dimensions of the square and the ...

Geometry
284)3828

Physics
1. Start from rest with constant acceleration of 2.11 m/s2 for 20.0 s. 2. Maintain a constant velocity for the next 2.75 min. 3. Apply a constant negative acceleration of ?8.44 m/s2 for 5.00 s. (a) What was the total displacement for the trip? Please explain with steps and an ...

Chemistry
9.3mL of ammonia base cleaner requires 12mL of 1M HCL to reach end point. A) what is molarity of ammonia and b) what is percentage of ammonia

biology
Why do you think the protocol does not say to dissolve compounds directly in 1 liter of water?

Algebra
Suppose that you have a supply of a 30% solution of alcohol and a 70% solution of alcohol. How many quarts of each should be mixed to produce 40 quarts that is 40% alcohol?

financial management
a. 7 b. 6

physical
calculate the force of gravity on a 1.2 x 10^5 kg space station at a distance of 3.5 x 10^5 m from earth's surface earth equal to 5.98 x 10^24 kg

Calculus1
Differentiate the function. y = ((4x^2 + 8x + 4)÷?(x)) x

trigonometry
FROM THE SKYDOME IN SM NORTH WHICH DIRECTLY ACROSS THE STREET, THE ANGLE OF ELEVATION OF TRINOMA IS 57°20' AND THE ANGLE OF DEPRESSION OF THE BASE IS 18°10'. IF THE BUILDING ARE 105 METERS APART, WHAT IS THE HEIGHT OF THE BUILDING?

trigonometry
FROM THE SKYDOME IN SM NORTH WHICH DIRECTLY ACROSS THE STREET, THE ANGLE OF ELEVATION OF TRINOMA IS 57°20' AND THE ANGLE OF DEPRESSION OF THE BASE IS 18°10'. IF THE BUILDING ARE 105 METERS APART, WHAT IS THE HEIGHT OF THE BUILDING?

Math, Algebra II
One-third of Connor's age is 11 years less than his age 13 years ago. How old is Connor?

calculus
Differentiate the function. f(x) = e^7

Science
What is the goal of technology A.to understand the natural world B.to improve how devices operate C.to improve how people live D.to understand how systems operate My answer A

trigonometry
A man standing 9m above the ground,observes the angle of elevation and depression of the top and bottom of Rizal monument in luneta as 6° 50' and 7° 30' respectively find the height of the monument

physical
staring from rest, a 3.5 kg object is acted upon by an unbalanced force and acquires a speed of 14.0 m/s after moving a distance of 35 m. find (a) the acceleration of the object, (b) the unbalanced force acting on the object, and (c) the time it takes for the object to attain ...

physical
a ball that was projected up at an angle of ? degrees with the horizontal has a flight time of 5.0s and covers a range of 49.0 m. find (a) the time it took to reach maximum height, (b) the horizontal and vertical components of its initial velocity, (c) its initial velocity,(d...

math
Simply using laws of logarithms 2log8^2+2log8^3 I tried this question I failed

physics science
a ball thrown vertically upward lands on the thrower's hand 24.5s. find (a) the time taken by the ball to reach its maximum height,(b) the maximum height attained by the ball, and (c) initial velocity of the ball

Math
please help with this question .Name two planes that intersect in UV in the figure to the right. I have a diagram to post as well is their a way to post it here ?

science
PV/T = constant. As pressure increases, volume decreases As volume increases, pressure decreases As temperature increases pressure increases As temperature increases volume could increase, but this is a closed system. I like the last choice.

Math
If this is a triangle then they sum to 180 degrees 4x+ 123 -5x-3 + 6x + 105 = 180 5x + 225 = 180 find x and then substitute the value into -5x -3 to find <DPC

math
9 - 31 9 + (-31) take the difference -22 degrees.

math
Two motorcycles are at the two ends of a road right next to a wall behind them (walls and road are perpendicular. They start heading towards one another in the opposite directions on two straight and parallel lines.Each vehicle has a constant velocity but one is faster. They ...

math
Three friends have 1/2 a pizza left. If they divide it evenly, what fraction of a pizza will each friend get?and i already tried and i didnt understand

composite functions
replace the x with the function. g of (f(x)) 2/(3(x+4/x) -1 I am not sure the g(x) is (x+4)/x or is is x plus 4/x that matters when simplifying.

MATH w/steps
12/120 + 10/120 - 6/120 16/120 = 1/x 120/16 = x 15/2 =x

Math-college
You can't set each part equal to 7. That only works when you set each part equal to 0. Using zero works because we know if something times something = 0 then one of the factors has to = 0. multiply first x2 -x -12 <7 x2 -x - 19 <0 Now, you can finish the problem.

maths
This can be done with a Venn Diagram with two intersection circles. If 17% failed both.. that goes into the overlap. then 35% failed English and 31% failed math. Got this by subtracting the 17% from both given values. Now.. some 17, 35 and 31 and subtract that answer from 100...

biology
You have to know the volume to find the density. density = mass/volume

Science
Generation and conduction of postsynaptic potentials and Integration of postsynaptic potentials and generation of action potentials How can these two relate to football players? Your thoughts?

Calculus
Would dc/dx=0 when x is 1.16?

Calculus
A rectangular storage container with an open top is to have a volume of 10 . The length of its base is twice the width. Material for the base costs $12 per square meter. Material for the sides costs $5 per square meter. Find the cost of materials for the cheapest such container.

algebra
Jennny decided to open up her new coffee shop. Jenny needs to know how much he will need to bring in with the coffee shop to keep up with costs and revenue. With this problem, we have to make the problem into this: profit=the revenue- the cost of the buildings coffee they ...

maths
The height of cuboid is 4 cm and the volume of the cuboid is 60 cm^3.What is the area of the shaded face?

math
An apartment building has 15 apartments in it. The tenant association is having a hard time collecting the fees from the tenants with an 0.6 probability of a tenant paying their fees. What is the probability of tenant association collecting fees from 11 out of the tenants ? ...

math
An apartment building has 15 apartments in it. The tenant association is having a hard time collecting the fees from the tenants with an 0.6 probability of a tenant paying their fees. What is the probability of tenant association collecting fees from 11 out of the tenants ?

science
2 hydrogen = 2 g 1 Oxygen = 16 g 18 grams so you had 9 grams 9/18 = 1/2 is the proportion. This would be 1/2 of a mole of water. or are you asking the proportion by mass of H to O 2/16 = 1/8

math
In a college, 30 students are taking a math class and 20 students are taking an English class. 5 students are taking both English and math. How many students are taking either English or math.

Math, algebra
1. If $x <> (sqrt xy)/(|x-y|), find 4 <> (9 <> 1) to the nearest tenth. <>=diamond This is a function, where the "diamond" represents a function. 2. If f(x) = 3x^2 - 5, what is the value of f(f(-1))?

Stats need help
Use the empirical rule to solve the problem. The systolic blood pressure of 18 yr. old women is normally distributed with a mean of 120 mmHg (millimeters of Mercury) and a standard deviation of 14 mmHg. What is the percentage of 18 yr. old women that have a systolic blood ...

Stats Help Help
Find the variance for the given data. Round your answer to two decimal places. 5.0, 8.0, 4.9, 6.8, and 2.8

Discrete or continuous help
Identify the given random variable as being discrete or continuous. The number of stories in a specific Manhattan office building.

STATISTICS
Determine which of the four levels of measurement is most appropriate. Heights of survey respondents.

STATISTICS
A bag contains 5 purple marbles, 7 yellow marbles, and 3 orange marbles. If two marbles are selected from the bag: What is the probability that a yellow then an orange are chosen without replacement.

RE: MathMate
Ok thanks so I did answer the question correctly.

math
Consider the two inequalities 3x + 2y ? 4 9x + 8y ? 14 2y ? -3x + 4 2y/2 ? -3x/2 + 4/2 y ? -3x/2 + 4/2 y ? -3x/2 + 2 slope -3/2 y- intercept 2 The black line is y ? -3x/2 + 2 8y ? -9x + 14 8y/8 ? - 9x/8 + 14/8 y ? -9x/8 + 14/8 y ? - 9x/8 + 7/4 slope -9/8 y- intercept 7/4 The ...

Algebra
If x + (1/x) = a Find these in terms of a: x^2 + (1/x^2) and x^3 + (1/x^3) I got a^2 and a^3 as my answers, but the book says a^2 - 2 and a^3 - 3a. How did they get that?

Algebra
What I don't understand about this problem is that what the letters mean? I am sorry I forgot the + d at the end.

Algebra
Find a trigonometric equation in the form y = a sin (b (x-c)) which has a minimum of (3, -5) and a zero value of (6, -1). There is a graph with the minimum and the zero value labeled. It is wavy with suggests that it is a sin curve.

Algebra
Solve 3^2x+1 = 5(3^x) + 2 I would know how to solve it if it was only 3^2x+1, but now it seems more complicated.

hookle's law
50 N/25 cm = 100 N/?? cm 50 cm stretch + 20 cm = 70 cm

math-probability
To win first prize, he has a 1/500 chance to win first and 3rd. Assume he wins the first prize which is 1/500 then chance of winning 2nd is 1/499 and chance of winning 3rd is 1/498 to get to your ANDS multiply the two probabilities.

Maths
b.Find the seventeenth term of an Arithmetic Progression, whose 9th and 15th term are 19 and 37 respectively.

statistics
At one college, GPAs are normally distributed with a mean of 2.6 and a standard deviation of 0.6. What percentage of students at the college have a GPA between 2 and 3.2?

Math - error NOT 2
It said NOT 2; therefore, the product of 1/2 times 5/6 would be your answer

Science
Consider a lead-acid battery with 500 Ah capacity and a rated voltage of 12 V. a)What is the total capacity of energy in watt-hours that can be stored in the battery? b)Assume that the battery is completely empty. The battery is now charging at a C-rate of 0.20C. What is the ...

politics
I agree!!

chemistry
honey is more dense than ink.

chemistry
If temperature increases, rate of evaporation increases. If it is more humid, the rate of evaporation decreases.

Social Studies
I bet if you do a google search of the McCarran Act, you will find the answer very quickly.

science
Carbon, hydrogen, oxygen, nitrogen, sulphur, phosphorus, boron, chlorine, flourine, iodine etc. are the non-metals Sodium, potassium, magnesium, calcium, cobalt, manganese, iron, zinc, tin, molybdenum, vanadium etc. are the metals.

  1. Pages:
  2. 1
  3. 2
  4. 3
  5. 4
  6. 5
  7. 6
  8. 7
  9. 8
  10. 9
  11. 10
  12. 11
  13. 12
  14. 13
  15. 14
  16. 15
  17. Next>>