Sunday

April 20, 2014

April 20, 2014

Total # Posts: 69

**Chemistry**

The half-life of Th-232 is 1.4E10. Find the number of disintegrations per hour emitted by 1 mol of Th-232.

**Chemistry **

The half-life of 232Th is 1.4 * 10^10. Find the number of disintegrations per hour emitted by 1 mil of 232Th in 1 min.

**math**

The grade of a road is 6%. What is its angle of elevation?

**College algebra**

Allison drove home at 58 mph, but her brother Austin, who left at the same time, could drive at only 40 mph. When Allison arrived, Austin still had 108 miles to go. How far did Allison drive?

**ECON**

did you possibly find the answer to this? im stuck on it aswell :)

**geometry**

what is the perimeter of a pool 7ft wide 10ft long 4ft high? Is it 34ft squared?

**algebra**

an investor invested a total of $2100 in two mutal funds. one fund earned a 9% profit while the other earned a 7% profit.if the total profit was $161 how much was invested in each fund

**maths**

kathleen spent 5/8 of her money and had 15e left how much had she at the start

**physics**

A person with a density of 980 kg/m3 floats in seawater of density 1025 kg/m3. What fraction of the person is submerged?

**CHEM EQB**

How many ml of 0.2M NaH2PO4 should b added to 40 mL of 0.1M Na3PO4 to make the buffer pH 7.2. Ka1:1.1 x 10^-2 Ka2:7.5 x 10^-8 Ka3:4.8 x 10^-13

**7th grade math**

I plan to...thanks again!

**7th grade math**

That's the same answer my daughter got on her test & the same one I came up with when going over her missed problems...I just wanted another person's input. Thank you!

**7th grade math**

-6(2r-4)

**Statistics**

suppose the correla tion between SAT Verbal scores and Math scores is .57 and that these scares are normally distributed. IF a student's Verbal score places her at the 90th percentile, at what percentile would you expect her Math scores to be?

**maths**

Good solution, Steve, but w+b+f=6+7+4=17. worms (w) - 6 bugs (b) - 7 butterflies (f)- 4 critters: w+b+f=22 points: 6w+7b+4f=119 (the only way to get an odd number is if b is odd) points from having one of each of the critters: w+b+f -> 6+7+4=17 so, using the points now: 6w+...

**math**

Good solution, Steve, but w+b+f=6+7+4=17. worms (w) - 6 bugs (b) - 7 butterflies (f)- 4 critters: w+b+f=22 points: 6w+7b+4f=119 (the only way to get an odd number is if b is odd) points from having one of each of the critters: w+b+f -> 6+7+4=17 so, using the points now: 6w+...

**MATH PLEASE HELP**

Given: Let f: X -> Y be a function. Then we have an associated function f^(-1): P(Y) -> P(X), where f^(-1) (B)⊂X is the inverse image of B⊂Y. Question: Show that f^(-1) is one-to-one if and only if f is onto. [Notes: ⊂ represents subspace, I just could...

**Math: Intro to Proofs**

Given: Let f: X -> Y be a function. Then we have an associated function f^(-1): P(Y) -> P(X), where f^(-1) (B)⊂X is the inverse image of B⊂Y. Question: Show that f^(-1) is one-to-one if and only if f is onto. [Notes: ⊂ represents subspace, I just couldn...

**medical terminology**

1. Dr. Hannah places a stethoscope to a seven-year-old child’s chest. The lungs reveal basilar rales. Which method is Dr. Hannah using to perform the physical examination? A. Auscultation C. Percussion B. Palpation D. Visualization Answer. A 2. Cardiology is the study of ...

**medical terminology**

1. Dr. Hannah places a stethoscope to a seven-year-old child’s chest. The lungs reveal basilar rales. Which method is Dr. Hannah using to perform the physical examination? A. Auscultation C. Percussion B. Palpation D. Visualization Answer. A 2. Cardiology is the study of ...

**medical terminology**

1. Dr. Hannah places a stethoscope to a seven-year-old child’s chest. The lungs reveal basilar rales. Which method is Dr. Hannah using to perform the physical examination? A. Auscultation C. Percussion B. Palpation D. Visualization 2. Cardiology is the study of the heart....

**physics**

In a lab experiment, a 1.5-kg cart traveling at 4.3 m/s in the +x direction collides with a 2.5-kg cart traveling at 2.7 m/s in the -x direction. After the collision, you find that the 2.5-kg cart is traveling at 1.9 m/s in the +x direction. How fast and in what direction is t...

**calculus**

please help. Compute Δy and dy for x = 4 and dx = Δx = -0.2. (Round the answers to three decimal places.) y = 4x - x2....im lost to were to start solving for delta y

**calculus**

please help i am lost at what is dy/dx and what is dy/dt. A trough is 10ft long and its ends have the shape of isosceles triangles that are 3 ft across at the top and have a height of 1ft. If the trough is being filled with water at a rate of 12ft^3/min, how fast is the water ...

**physics**

The velocity of a 2.5 kg block sliding down a frictionless inclined plane is found to be 1.58 m/s. 1.40 s later, it has a velocity of 7.32 m/s. What is the angle of the plane with respect to the horizontal (in degrees)?

**physics**

A mass m = 0.225 kg on a frictionless table is attached to a hanging mass M = 0.330 kg by a cord through a hole in the table (see the figure). Find the speed with which m must move in order for M to stay at rest if r = 27 cm.

**calculus**

Please help. i am confused on how to do this one. I keep getting arcsin(square root -cos9x) but it is wrong. The probem is F(x)= arcsin(sqtsin(9x))

**calculus**

find the derivative of e^8e^x *8e^x

**calculus**

PLEASE HELP Find the first and second derivatives of the function. y = e^8ex. I keep getting y' = e^8ex * 8 and its wrong. how do you do this?

**chemistry**

what type of interaction is Mg2+, O2- What type of interaction is Na+, Cl- What type of interaction is I-I What type of interaction is H2CO, and CO What type of interaction is SO2, C6 H14

**calculus**

please help! Find an equation of the tangent line to the curve at the point (-1, 1). y = 5x3 - 6x. y=? ...............i keep getting y=x+2 and its wrong. can someone please help?

**Science**

as a substance melts, it changes from solid to liquid and heat is absorbed

**Chemistry**

water boils at 100 degrees celsius water freezes at 0 degrees celsius 1 K = 273 degrees celcius all you have to do is calculate the K value for 0 celcius and the K value for 100 degrees celcius and subtract to find the difference :)

**chemistry reaction rate**

add more NO so that the equation will equilibrate by producing more NO2

**calculus**

Jill likes to play Blackjack. She heard about a winning strategy to ensure she does not lose. The strategy is: choose a starting amount to bet, and then double your bet if you lose. Keep doubling your bet until you win. When you win a hand, go back to the starting bet. Hoping ...

**physics**

A 33 N force acting at 90° and a 44 N force at 60° are applied concurrently at a point P. What is the magnitude and direction of the resultant force?

**economics**

what are the theories of david mcclelland?

**algebra**

what is the equation of a hyperbola with one vertex at (6,5) and the equation of asymptotes are 5x-6y-30 and 5x+6y-30?

**math**

what is the equation of a hyperbola with one vertex at (6,5) and the equation of asymptotes are 5x-6y-30 and 5x+6y-30?

**architecture**

can you give me some websites for architectural designs for a 2 bedrooms bungalow?

**Physics**

a. 490 j

**math**

what is the equation of a hyperbola with one vertex at (6,5) and the equation of asymptotes are 5x-6y-30 and 5x+6y-30?

**math**

what is the equation of a hyperbola with one vertex at (6,5) and the equation of asymptotes are 5x-6y-30 and 5x+6y-30?

**algebra**

I need to write an equation for the following: Denise's cell phone plan is $29.95 per month plus $.10 per minute for each minute over 300 minutes of call time. Denise's cell phone bill is $99.95. For how many minutes was she billed?

**chemistry**

How many moles of O2 are needed to react with 2.90 moles C2H2

**calculus**

Choice 1: Payments of $ 2600 now, $3000 a year from now, and $3450 two years from now. Choice 2: Three yearly payments of $ 3000 starting now. Interest is compounded continuously. (a) If the interest rate on savings were 4.76 %,which would you prefer? (b) What is the interest ...

**Math 10th grade**

five marbles in a jar are green. the odds against choosing a green marble are "4:1" how many marbles are in the jar

**science**

what is the independen variable and the dependent variable for scientific method to how does air pressure in a tire save gas

**Microeconomics**

excess milk supply

**Algebra 2**

Solve by completing the square: x^2+9x+6=0

**math**

if you simplify its 1:8.5

**Math gr 8**

I'm not sure how to solve this into a ratio, but a way you could find the average speed, would go like this. First, you'd change minutes into seconds, since you are dealing with meters. then divide. How many meters per second did each person run?

**Math gr 8**

Well, first things first. Do you know which formula you'll be using for this?

**math**

So what if you were factofing 2x^2-x-35=0?

**math**

So is that the same way you'd do 3x^2+9x-12=0?

**math**

i need to solve this equation by completing the square: x^2-14x+1=0 i don't' know how to do this, nor do i know what complete the square means. please help.

**college**

why did the united states annex the philippines

**alabama state**

America's continued demographic trend toward urbanization would eventually result in the majority of the population living in cities, which finally did occur by the time of which U.S. Census reporting period?

**sose**

why did the people who lived in the colonies prior to 1901 feel that they needed to join together to make one country?

**music**

i don't think is that group, there are about 4-5 people singing that song. I just remember the title have the word sometimes or somewhere, the title is about 4-5 words long. Maybe its not a group, it might be a crossover or something, having a japanese and some caucasians.

**music**

Hi, I am looking for an old english song, but I don't remember the song title, its a slow love song and the only thing i remember is that the singers are all male and there are more than one, some asian looking probably japanese and also caucasians. The title might be have...

**PHYSICS!!**

Comet Halley returns every 74 years. Find the average distance of the comet from the sun. How do i do this??

**math**

I think the answer to my first problem is 15 for the total bill but I am just guessing. I need to explain the answer.

**math**

I am only in 5th grade and not using x yet. This is part of parts and whole fractions.

**math**

is this the right answer: My friend paid 9 dollars and the total bill is 15? Could you also tell me if the answer to the following is 16? If 12 counters are 3/4 of a set, what is the whole set?

**math**

I need this by tomorrow morning I had $6 to pay for part of lunch. My friend had enough money to pay the other part or 3/5 of the bill. What is the total bill?

**Early Child Ed.**

I say the answer is A. I am Nic's mom and both of my children have been in classes where special needs children were mainstreamed with nonspecial needs children and the teachers always removed the disruptive child.

**Algebra**

I'm having a problem solving the following example. The teacher wants it in this format. 1st the Verbal Model, 2nd the Labels 3rd Algebraic Model 4th- Solve and finally 5th part: Answer Question. Example: You are working on a scouting badge. You need 60 points on 4 project...

**help**

how do u cite the newspaper the couier journal http://owl.english.purdue.edu/owl/resource/557/08/ Here is a website that gives you specific instructions and examples for the resource you need to cite. In the future, it would help if you put the SUBJECT in the Subject line -- i...

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