Thursday
July 31, 2014

Posts by David


Total # Posts: 1,620

Algebra
First to find slope -8--6/(-4)-(-1) = slope 2/3 Substituting y-(-8)=2/3 (x-(-4) y=2/3x-16/3

Pre-Algebra
On a trip from Lousiana to Flordia, your family wants to travel at least 420 miles in 8 hours of driving. Write and solve an inequality to find what your average speed must be.

Math Geometry
The angle bisector of one angle of a triangle forms two angles that measure 27 degrees. The angle bisector of another angle forms two angles that measure 34 degree. What is the measure of the third angle of the triangle?

Math Geometry
A right triangle has one angle that measures 16 degrees. What are the measures of the other two angles?

phoenix
o Find a movie review in an online publication for a movie currently playing in theaters. Post the link to the review for the class and provide five examples of how the reviewer used adverbs and five examples of the use of adjectives. Has the reviewer used them effectively? Ex...

Chemistry
The decomposition of IBr(g)into I2 (g) and Br2 (g) is first order in IBr with k = 0.00255/sec. (a)Starting with [IBr] = 1.50M, what will [IBr] become after 2.50 minutes? (b)How long, in minutes, will it take for [IBr] to go from 0.500M to 0.100M? (c)What is the half-life for t...

Chemistry
The decomposition of IBr(g)into I2 (g) and Br2 (g) is first order in IBr with k = 0.00255/sec. (a)Starting with [IBr] = 1.50M, what will [IBr] become after 2.50 minutes? (b)How long, in minutes, will it take for [IBr] to go from 0.500M to 0.100M? (c)What is the half-life for t...

Physics
An airplane must reach a speed of 185 mi/h to take off. If the runway is 467 m long, what is the minimum value of the acceleration that will allow the airplane to take off successfully? m/s2 I have been trying the formula vf^2=Vi^2+2AD and solving for A SO my work has been 185...

Chemistry
The decomposition of IBr(g)into I2 (g) and Br2 (g) is first order in IBr with k = 0.00255/sec. (a)Starting with [IBr] = 1.50M, what will [IBr] become after 2.50 minutes? (b)How long, in minutes, will it take for [IBr] to go from 0.500M to 0.100M? (c)What is the half-life for t...

physics
Two cars start from rest at the same location and at the same instant and race along a straight track. Car A accelerates at 6.6 fps2 to a speed of 90 mph and then runs at this constant speed. Car B accelerates at 4.4 fps2 to a speed of 96 mph and then runs a a constant speed. ...

College Accounting
Apr. 1 Cash $40,000.00 Capital $40,000.00 Apr. 4 Land $30,000.00 Cash $30,000.00 Apr. 8 Advertising $1,800.00 Accounts Payable $1,800.00 Apr. 11 Salaries $1,800.00 Cash $1,800.00 Apr. 13 Prepaid Insurance $1,500.00 Cash $1,500.00 Apr. 17 Drawing $1,000.00 Cash $1,000.00 Apr. 2...

physics
A certain spring stretches 5.3 cm when it supports a mass of 0.65 kg . If the elastic limit is not reached, how far will it stretch when it supports a mass of 10 kg ? Answer in cm

Physics
Some enterprising physics students working on a catapult decide to have a water balloon fight in the school hallway. The ceiling is of height 3.2 m, and the balloons are launched at a velocity of 12 m/s. The acceleration of gravity is 9.8 m/s2 . At what angle must they be laun...

physics
Some enterprising physics students working on a catapult decide to have a water balloon fight in the school hallway. The ceiling is of height 3.2 m, and the balloons are launched at a velocity of 12 m/s. The acceleration of gravity is 9.8 m/s2 . At what angle must they be laun...

Physics
A certain spring stretches 5.3 cm when it supports a mass of 0.65 kg . If the elastic limit is not reached, how far will it stretch when it supports a mass of 10 kg ?Answer in units of cm

physics
You place a box weighing 302.1 N on an in- clined plane that makes a 35.6 angle with the horizontal. Compute the component of the gravita- tional force acting down the inclined plane. Answer in units of N.

Algebra
Hi. I am having some problems with substitution method and i just can't seem to get these right. I have 1. 2x - 3y = -1 with y = x-1 2. -4x + y = 6 with -5x- y = 21 and finally, 3. -5x + y =-3 with 3x -8y = 24

Algebra
Hi. I am having some problems with substitution method and i just can't seem to get these right. I have 1. 2x - 3y = -1 with y = x-1 2. -4x + y = 6 with -5x- y = 21 and finally, 3. -5x + y =-3 with 3x -8y = 24

math
a christmas tree is 34 feet tall. it casts a shadow 24 feet long. toms christmas tree is standing beside the tree at rockefeller center and is 5 feet 8 inches tall. how long of a shadow would toms tree cast?

psychology
the paralysis was the unconscious way of dealing with his impulse (id) to hit his father?

4th grade
Nick had 1 3/4 gallon of milk. How many pints of milk does Nick have.

algebra
the solution to the system of equations y= 2x and y = -x + 3 is a)2,1 b)(-1,2) c)2,-1) d)(1,2)

algebra
thank you gabby!!!!!!!!!!!!

algebra
the solutions to the system of equations y= 2x and y =-x + 3 is a)2,1 b)(-1,2) c)2,-1) d)(1,2)

12th grade
one type of probability used everyday is: a)experienced probability b)scientific probability c)frequency of occurence d)none of the above

math
when you put something in parenthesis like C(25,8) what does that mean or how do you solve it?

Math
Suppose you are managing 25 employees, and you need to form three teams to work on three different projects. Assume that all employees will work on exactly one team. Also, each employee has the same qualifications/skills, so any employee can serve on any team. The number of em...

Algebra
x = 0.5 4x = 2 4(0.5) = y - 1 +1 on both sides... y = 3! Thanks!

Algebra
I know but wouldn't you have to go through confusing fractions and multiply by fractions to get a whole number of x? I am trying to follow the teachers directions which do not include fractions.......

Algebra
Slove each system by substitution. 4x = y - 1 6x - 2y = -3 I have already attempted this problem and couldn't figure out what I should do. I came out with 4x + 1 = 3x + 1.5 I think this looks right because our teacher told us that for this specific problem that we should g...

physics
Ffg

physics
1.) A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed 2.5 cm in bringing the block to a momentar...

physics
A string has a linear density of 8.5*10^-3 kg and is under the tension of 280 N. The string is 1.8 m long, is fixed at both ends, and vibrating in the standing wave pattern. What is the speed, length, and frequency?

physics
1.) The average sound intensity inside a busy neighborhood restaurant is 3.*10^-5 W/M^2. How much energy goes into each ear (area = 2.1 * 10^-2 m^2) during a one hour meal? 2.) A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity b...

physics
The length of a simple pendulum is 0.79m and the mass of the particle at the end of the cable is 0.24 kg. The pendulum is pulled away from its equilibrium position by an angle of 8.5 degrees and released from rest. Assume that friction can be neglected and that the resulting o...

physics
1.) A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30 kg block is dropped from rest. It collides with and sticks to the spring, which is compressed 2.5 cm in bringing the block to a momentar...

algebra
Find the mean for each set of data. Round to the nearest tenth if necessary. 12, 20, 8, 15, 16, 14, 7, 5, 11, 8, 14 a. 11.8 b. 13.2 c. 9.9 d. 10.4 My answer a)11.8

Calculus
prove that out of the rectangles under the curve = e raised to the power of -xsquared on the x axis and upper vertices on the curve, the one has the largest area the two upper vertices of which are exactly at the points of inflection of the curve.

engineering science
The power in a resistor RLOAD of 10 Ω when connected to a 100 volt supply is measured using a voltmeter and ammeter. There are two possible ways of connecting the meters as shown in FIGURE 2. The resistances RA and RV represent the internal resistances of the ammeter and ...

trigonometry
equation of circle passing through P(10,3), Q(11,8), and R(7,14).

Math
7

math
what is a slope intercept?

chemistry
in outo engine whith no pollusion controls, about 5% of the fuel(assume 100%actane c8H18)is unburned .calculate the mass and volume ratio of Co to C8H18 in exhaust gas? 2C8H18+17O2 =16CO+18H2O

Chemistry
Which of the following electron configurations is not consistent with Hund's rule? 1) 1s^2 2s^2 2p^2 3s^1 2) 1s^2 2s^2 2p^6 3s^2 3p^5 3) 1s^2 2s^2 2p^6 3s^3 3p^6 4) 1s^2 2s^2 2px^2 2py^1

Chemistry
Which of the following electron configurations is not consistent with Hund's rule? 1) 1s^2 2s^2 2p^2 3s^1 2) 1s^2 2s^2 2p^6 3s^2 3p^5 3) 1s^2 2s^2 2p^6 3s^3 3p^6 4) 1s^2 2s^2 2px^2 2py^1

Physics
An aluminum cylinder with a density of 2.70 g/cm3 has a volume of 3.8 ¡¿ 10-5 m3. If the cylinder is suspended from a scale and immersed in an unknown fluid, the scale reads 0.581 N? What is the specific gravity of the fluid?

college chemistry
Being that FeO has a metal in it and a pretty strong bonding force, I would say Iron(II)Oxide. CO2 is low, H2O is 0 degrees Celsius, and sugar is relatively low as well.

geometry
francisco designed a triangular garden surrounded by three square gardens. the area of garden c (the largest garden) is 400 sq. ft. and the length of a side of garden b is 12 ft. find the lengths of all sides of the triangular gardens and find the areas of the gardens. draw a ...

physics
wow. that was simple. thank you.. i should read the question more carefully next time :D

physics
A 52 g mountain climber, start from rest, climbs a vertical distance of 730 m. At top, she is again at rest. In the process, her body generates 4.1*10^6 J of energy via metabolic processes. Her body acts like a heat engine with efficiency ( W/Q_h.) W is the magnitude of work d...

science
. What must happen in order for a sound wave to form? A. An electric current must flow. B. A certain frequency must be reached. C. Matter must vibrate. D. Volume must be absorbed.

Algebra
This is about direct variation. The area a painter can paint varies directly with the amount of time he works. One morninig, he painted 204 ft² between 8 a.m. and 12:15 PM. Write a direct variation equation to describe the area y covered in x hours. The forumlua for direc...

Algebra
This is my third question about direct variation. For this problem, tell whether each relationship is a direct variation. Explain. x | -1 | 5 | 8 | y | -1.5 | 7.5 | 12 |

Algebra
This is question 2 about direct variation For this problem, tell whether each relationship is a direct variation. Explain. x | 8 | 0 | -5 | y | 13 | 5 | 0 |

Algebra
For this problem, tell whether each relationship is a direct variation. Explain. x | -3 | -6 | -9 | y | 18 | 36 | 54 | My teacher didn't really explain direct variation very well, but i did catch that you put x over y. (Hopefully this helps)

chemistry
I worked it out to need 8458.6K would this seem like resonable value? thank you for you're help

chemistry
I think charles law is needed were pressure and mole mass is constant, temperature and volume varies. Im stuck putting it all together.

chemistry
how do I calculate what temperature is needed to heat 52 grams of ethane to occupy 1200ml?

physics
An object is solid throughout. When the object is completely submerged in ethanol alcohol., its apparent weight is 15.2 N. When completely submerged in water, its weight is 13.7 N. What is its volume? Steps please.. answer isnt really necessary

Physics/Chemistry
few other questions. 1.) Suppose you expend 430 kilocalories during a long walk, how many liters of ice water at 0 degrees do you need to consume in order to use up the 430 kilocalories of metabolic energy. Stomach can hold 1 liter. 2. A person eats a container of strawberry y...

Physics
An object is solid throughout. When the object is completely submerged in ethanol alcohol., its apparent weight is 15.2 N. When completely submerged in water, its weight is 13.7 N. What is its volume? Steps please.. answer isnt really necessary

Physics/Chemistry
few other questions. 1.) Suppose you expend 430 kilocalories during a long walk, how many liters of ice water at 0 degrees do you need to consume in order to use up the 430 kilocalories of metabolic energy. Stomach can hold 1 liter. 2. A person eats a container of strawberry y...

physics
An object is solid throughout. When the object is completely submerged in ethanol alcohol., its apparent weight is 15.2 N. When completely submerged in water, its weight is 13.7 N. What is its volume? Steps please.. answer isnt really necessary

C++ Programming
Where would I find a great video resource for learning Visual C++ for beginners? I'm a newbie and I'm looking in some code for a project on sourceforge that i'm interested in. however, I don't know C++ so i don't know how to contribute to this program. Wher...

math
While on his way to school, Norman saw that the cost of gasoline was $2.50 per gallon. Write a direct variation equation to describe the cost y of x gallons of gas. Then graph.

Chemistry
Hi there, I am doing some data calculations for my lab, but I'm having some trouble. Given: Mass of ferrous ammonium sulfate=4.0g Mass of K3[Fe(C204)3] 3H20 =4.53g 1. Using the above mass of ferrous ammonium sulfate, calculate the theoretical yield of the K3[Fe(C204)3] 3H2...

Quick Question
yes.

math
Writing in math, how can estimating help you add two-digit numbers?

Chemistry
Name these compounds (^these are symbolize subscripts) 1. CoCl^3 2. CrF^6 3. AgBr 4. Fe^20^3 5. CrF^3 6. TiCl^4

Physics help
A 1.0 kg object is suspended from a vertical spring whose spring constant is 105 N/m. The object is pulled straight down by an additional distance of 0.25 m and released from rest. Find the speed with which the object passes through its original position on the way up.

Algebra 1
o ok thank you

Algebra 1
write a function rule for each situation. The volume V(n) of a cube when you know the length n of a side.

Chemistry
Why do magnesium, phosphorus, and zinc exhibit slightly higher first ionization energies than the general trend within each of their periods?

Chemistry Honors
Hello, Can you please tell me how a fisher chart differs from a traditional chart?

CHEMISTRY
Hello, Can you please tell me how a fisher chart differs from a traditional chart?

physics help
A 5.00 kg ball (ball 1), moving to the right at a velocity of +4.00 m/s on a frictionless table, collides head-on with a stationary 7.60 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below. (a) elastic collision ball 1 ball 2 (b) com...

economics (game theory)
Consider the normal tick tack toe game, but this time you have to AVOID getting 3 in a row in any line. Is there any strategy you can tell me that will make sure the first mover doesnt lose. Thanks

physics
Water is flowing at 6 m/s in a circular pipe. If the diameter of the pipe decreases to five-seventh its former value, what is the velocity of the water downstream?

chemistry
predict the order of increasing acidity of the compounds. Give a brief explanation why. Butanoic acid-Nexanoic acid-Benzoic acid-Acetic acid. thx

English
which of the following words cannot use the suffix -ive? reveal- decis- conclus- impress-

chemistry
Can you tell me the geometry(around the carbon/oxygen atom) and whether this is polar or non polar CH3CH3? thx

chemistry
i need 2 lewis dot structures for C3H8O. thanks

chemistry
i need 2 lewis dot structures for C3H8O. thanks

Science
What do engineers do?

science
o ok thank u

science
Yes,I'm asking for habitat niches. the island was devastated by volcanic activity.

science
Why are so much niches available on so much recently devastated islands?

Algebra
Factorise completely: 6x^2+10x-5= and 6x^2+8x-3=

8th grade
thank you

8th grade
how do seed banks preserve seeds for future generations?

chem.
CH3COOH + C5H12O -> C7H14O2 + H2O If the yield for the reaction is 45%, how many grams of the product are formed when 3.58 g of acetic acid are reacted with 4.75 grams of isopentyl alcohol? Millimoles of acetic acid= 59.6667 Millimoles of isopentyl alcohol= 53.9773 How woul...

Chemistry
CH3COOH + C5H12O -> C7H14O2 + H2O If the yield for the reaction is 45%, how many grams of the product are formed when 3.58 g of acetic acid are reacted with 4.75 grams of isopentyl alcohol? Millimoles of acetic acid= 59.6667 Millimoles of isopentyl alcohol= 53.9773 How woul...

physics
A 280 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m. (a) Find the work done by the pulling force. ...

math
How do I take the derivative in respect to c1 for the following utility function? u1 = log(c1) + log [1/2(x-c1-c2)] details please

math
How do I take the derivative in respect to c1 for the following utility function? u1 = log(c1) + log [1/2(x-c1-c2)] details please

Physics
Two identical cars are traveling at the same speed. One is heading due east and the other due north, as the drawing show. What is true regarding the kinetic energies and momenta of the cars?

Physics
The equation here is -8.4=.145(-32+V)

O Chem
I need help with this question please. Draw the structure of triacylglycerol formed from oleic acid, linoleic acid, and stearic acid. Give balanced equation and show how much hydrogen would be needed to reduce the triacylglycerol completely, show the product.

Chemistry
what's the answer?

intro to chemistry
A sample of nitrogen has a volume of 50.0L at a pressure of 760mmHg. What is the volume of the gas at each of the following pressures if there is no change in temperature? A. 1500mmHg B. 2.0atm C. 0.500atm

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