Saturday

April 19, 2014

April 19, 2014

Total # Posts: 256

**science**

if you wanted to consult the geologic time scale for when the first vertebrates evolved, where would you look?

**Accounting**

During the week ended May 15, 2013, Scott Fairchild worked 40 hours. His regular hourly rate is $31. Assume that his earnings are subject to social security tax at a rate of 6.20 percent and Medicare tax at a rate of 1.45 percent. He also has deductions of $48 for federal inco...

**Help Here**

Help me please.

**Social Studies**

On the world or in general. I'm trying to argue the mayan civilization was the best and i need to know what negative effects did the Incas and Aztecs do.

**Social Studies **

What were the negative impact or effects of the Incas and Aztecs? Thank You

**Social Studies **

Has the effort of Westerners to aid the rest of the world done more good than harm? Its a opinon but i would like a answer please. Please make your answer at least 6 sentences. Thank you very much

**math**

the odds are against 2/7. Meaning 2 out of 7 chances you are going to have s. And 5 out of 7 you will not get S.

**ap biology**

What barriers might hinder the acquisition of plasmids?

**algebra**

. Mrs. Crenshaw has confiscated 4 cell phones from 4 different students because they used them during class. To get the cell phones back, they have to answer the fol- lowing question: What is the probability that no student receives his or her own phone if Mrs. Crenshaw hands ...

**Statistics**

I have 8 marbles: 3 blue, 1 green, 4v reds. What is the probability of selecting a blue marble twice with replacement and twice without replacement

**algebra**

There is an 18 inch sandwhich that Jenny cuts and gives half of the sandwhich to Demi and Joel gets 3/4 of what jenny has. Add all up to 18

**Math**

Thank you PsyDAG this will be very helpful.

**Math**

When Christy made tortillas for the first time, she used all the dough to make 10 tortillas. After making quesadillas, she decided that the tortillas were not large enough. The next time, using the same amount of dough, she made each tortilla the same thickness but 25% larger...

**Physics**

A man at point A directs his rowboat due north toward point B, straight across a river of width 100 m. The river current is due east. The man starts across, rowing steadily at 2.50 m/s and reaches the other side of the river at point C, 150 m downstream from his starting point...

**Social Studies**

What events in hitler's childhood lead him to become a dictator? Please help and thank you so much.

**English**

How would you paraphrase this excerpt from "A Tale-Tell Heart" by Edgar Allen Poe; "I bade them search - search well. I led, at length, to his chamber. I showed them his treasures, secure, undisturbed"

**Algebra**

Thank you very much!!!

**Algebra**

If f(x)=2x+1 and g(x)=3x-5, find f(g(2)).

**math**

Thank you!

**math**

A support wire runs from the top of a tower to the ground. If the tower is 1200 feet tall and the wire is attached to the ground 500 feet away from the tower, how long is the support wire?

**Chemistry**

Your space ship has docked at a space station above Mars. The temperature inside the space station is 24oC at a pressure of 745mmHg. A balloon with a volume of 425mL drifts into the airlock where the temperature is -95oC and the pressure is 0.115 atm. What is the new volume of...

**finance**

company starting salary 75,000 retirement benefits 401k with annual contribution of 5% company will match 3% (for max contribution of 8% salary) avg 401k return within mutual fund options at 8% per year sign on bonus 0 annual bonus after 2 years of service annual bonus of $200...

**MATH**

5000000 times x divied by y ?

**MATH**

what is : 4)x+y)-10

**math**

what is 71 times 45 equal

**algebra**

Thank you Ms.Sue!!!!

**algebra**

Find 2 consecutive integers, the smaller a perfect cube and larger a perfect square.

**Calculus**

I'm struggling some with the us of trigonomic properties. The problem is integral sin(2x)sec(x) dx and I dont understand how sin(2x)sec(x) simplifies into 2sin(x).

**psychics**

The lower frequency limit for human hearing is usually considered to be 20.0 Hz. (a) What is the speed of sound in m/s if the air temperature is 20.0ºC? (b) What is the corresponding wavelength for this frequency?

**Physics**

The lower frequency limit for human hearing is usually considered to be 20.0 Hz. (a) What is the speed of sound in m/s if the air temperature is 20.0ºC? (b) What is the corresponding wavelength for this frequency?

**Guidance and discipline**

At what age is it typical for a child to begin testing the word no

**math**

12*120=1440

**math**

what number could represent the height of a bird 120 feet the surface of the ocean

**Science**

what is the central theme of the first green revolution?

**math**

it is claimed that the average age of employees in a large company is 50. a sample of 36 employees is taken and the average age was 49. the standard deviation of the population was 5. use a level of significance of 0.5. what do you think of the claim?

**science**

you need to prepare 30g of calcium cholride. you have 2m hydrochloric acid and a new container off pure calcium carbonate. Calculate the number of mole of calcium chloride that u need to prepare

**math**

jimmy is playing a dart game at an arcade. he can earn 2,3,or 6 points with each dart. she scored 24 points. how many ways could he score 24 points given that each dart thrown landed on the dart board?

**math**

thanks Reiny

**math**

Rohnda is in charge of buying food for the school picnic, she found that hot dogs are in packages of 24, buns in packages of 18, ketchup in boxes of 12, and mustard in boxes of 15. what is the least number of students that can be feed if each student receives 1 of each item an...

**math**

thank you a bunch reiny

**math**

The greatest common factor of 2 numbers is 14, the least common multiple is 168. If the 2 numbers are not 14 and 168, what is the sum?

**math**

a pentagon is a polygon with 5 sides

**Math**

i need an example problem using log10E=11.4+1.5m when E means radiated energy and m is means magnitude. the log has a base of 10 thats why the 10 is there. plese help!!! Again, need an example problem relating it to earthquakes

**Math**

A bicycle trail is 7miles and 880 yards long.How many total yards is the bicycle trail

**CHEMISTRY HELP PLEASE!!**

@DrBob222 so, for the first part I do, Ksp = (Mg^2+)(OH^-)^2 , which is 1.8x 10^-11 = (.0286)(OH)^2 for OH-, i get 2.51 x 10^-5 then, for the second part, I do, Kb = (NH4^+)(OH^-)/(NH3), which is 1.8x 10^-11 = (NH4)(2.51 x10^-5)/(.114) for NH4, i got 8.17x10^-8 mol then I conv...

**CHEMISTRY HELP PLEASE!!**

0.350L of 0.160 M NH3 is added 0.140 L of 0.100 M MgCl2 . How many grams of (NH4)2SO4 should be present to prevent precipitation of Mg(OH)2 (aq) ? The Ksp of Mg(OH)2 is 1.8 x 10–11.

**math**

$84.00

**physics**

At the moment car A is starting from rest and accelerating at 5.0 m/s2, car B passes it moving at a constant speed of 45m/s. How long will it take car A to catch up with car B?

**math**

There are 5 yellow cards, 4 red cards, and 1 purple card. He draws a card at random, replaces it, and draws a second card. What is the probability that both cards will be red?

**SS8R - paragraph help!**

I think it good.

**math**

I am not sure but I think it is 50,400 dollars a week. 60 minutes in one hour 24 hours in one day 7 days in week (5x60)=300 300x24= 7200 7200x7=50,400

**Maths**

x+2x+3x=180 add them. 6x=180 divide 180/6= 30

**spanish**

dark haired/skinned

**Health**

Gonorrhea is spread through contact with the ________. A. Anus, !@#$%^&, Mouth, Skin B. !@#$%^&, Anus, Mouth, !@#$%^& C. !@#$%^&, Skin, !@#$%^&, Anus D. Mouth, !@#$%^&, !@#$%^&, Fingers I think it's B?

**p.e.**

a scull is to rowing as a -------- is to yachting.

**Calculus**

Assuming that f and g are functions differentiable at a (though we do not know their formulas). Prove that f +g is differentiable at a using the definition of the derivative.

**Physics**

A dog running in the +y-direction at 6.0 hears its owner call from behind, and 2.7 later it's running at the same speed in the opposite direction. Calculate the dog's change in velocity. Calculate the average acceleration

**Calculus**

F(x)=|x-5| evaluate the following limits lim x->5- ( f(x)-f(5))/(x-5) lim x->5+ ( f(x)-f(5))/(x-5)

**physics**

A wire tooth brace used by orthodontists. The top-most tooth is protruding slightly, and the tension in the wire exerts two forces at 16 º angle on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 19.5 N, what is the magnitude ...

**physics**

A 316-kg boat is sailing 12.0° north of east at a speed of 1.60 m/s. 39.0 s later, it is sailing 36.0° north of east at a speed of 4.00 m/s. During this time, three forces act on the boat: a 31.4-N force directed 12.0° north of east (due to an auxiliary engine), a ...

**Physics**

Two arrows are shot vertically upward. The second arrow is shot after the first one, but while the first is still on its way up. The initial speeds are such that both arrows reach their maximum heights at the same instant, although these heights are different. Suppose that the...

**Health**

I believe the correct answer is C. increase;reduce?

**Health**

I put D down and got it wrong.

**Physics**

A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 3.9 s later. If the speed of sound is 340 m/s, how high is the cliff? i know you use the equation y=(initial velocity)(time) + (1/2)(acceleration)(time^2) but I'm having problems putting all...

**Science**

What happens to approximately 60% of the energy released during the complete oxidation of glucose? A) It is used to synthesize more ATP. B) It is reused to supply the energy for anabolic reactions. C) It is stored in the body as fat. D) It is lost by the body in the form of heat

**science**

In a micelle, why do you find the fatty acid chains of the of the phospholipid molecule are on the inside of the bilayer?

**vulindlela**

I believe that the correct answer is B. Physical activity.

**Calculus**

How do you use imlicit differentiation to differentiate e^(xy)? I have the problem "use implicit differentiation to find dy/dx. e^(xy)+ x^2 - y^2 = 10. I've gotten to the point whereI have d/dx(e^(xy)) + 2x - 2ydy/dx = 0, but I can't go any further because I don&#...

**Calculus I**

Okay, thanks guys!

**Calculus I**

Find the derivative of y=ln((1+e^x)/(1-e^x)) I know that the derivative of y=ln(1+e^x) would be (e^x)/(1+e^x), but I'm not sure what to do with the 1-e^x on the bottom here. Can someone help please? Thanks!

**Chemistry help PLEASE!!!**

The solubility of AgCl(s) in water at 25 C is 1.33x10^-5 M and its deltaH of solution is 65.7 kJ/mol . What is its solubility at 60.1 C ? Please explain how to solve for this!!

**fourth grade math**

if two dice are rolled together,which outcome is more likely-dots totaling 12 or dots totaling 7? explain you anser.

**fourth grade math**

if two dice are rolled together,which outcome is more likely-dots totaling 12 or dots totaling 7? explain you anser.

**Math**

Delia works from 8:00 a.m. to 4:30 p.m. and has one hour each day for lunch. How much does she earn for a five-day workweek at $4.80 per hour?

**social studies**

Were cassette tapes famous when they first came out?

**math**

Just pick 3 mid sized cars.

**algebra 2**

The answer is y=2x+7. First put it in point slope form then solve it into slope-intercept form. Use the same slope because having parallel lines means the same slope.

**biology**

A dominant gene A produces wire-haired texture in dogs. Its recessive aamllele a produced smooth hair. Cross the heterozygous wire-haired dog with homozygous smooth-haired dog. List the genotype and phenotype ratios of all the possible offspring.

**Geometry**

the answer to this queston is acute! :)

**physics**

A small cart weighs 15.0 N. If a constant force of 25 N is used to move the cart horizontally across the desk, A] What will be the acceleration of the cart? B]How far will the car move in 1.0 second

**Physics Help Please**

Issac has to do 1000J of work on a 5kg box, and all the work he did simply went into lifting it above the ground. How high above the ground will the box be when all the work has been done?

**physics**

a football punter accelerates from rest to a speed of 8 m/s during the time in which his toe is in contact with the ball (about 0.21 s). If the football has a mass of 0.50 kg, what average force does the punter exert on the ball?

**physics**

a bag of sugar weighs 5.00 lb on earth. What would it weigh in newton on the moon, where the free fall is one-sixth that of the earth?

**physics**

a 8.0 kg object undergoes an acceleration of 2.2 m/s squared.what is the resulting force acting on it?

**physics**

a football punter accelerates a football from rest to a speed of 7 m/s during the time in which his toe is in contact with the ball (about 0.18 s). If the football has a mass of 0.50 kg, what average force does the punter exert on the ball?

**physics**

While exploring a cave, a spelunker starts at the entrance and moves the following distances: 75.0 m north, 225 m east, 160 m at an angle 30.0° north of east, and 150 m south. Find the resultant displacement from the cave entrance.

**nursing **

What are ways you provide education to patients in your work place regarding chromic diseases?

**Nutrion**

What types of pathogens? What habits in your food preparation practices do you think might cause these pathogens to grow? What habits can you change in your life to reduce your risk of foodbourne illness?

**nutrition**

Review the nutrition quality of the items, using what you know about daily values, and ingredients (one of the products must have a health claim). Write a 300-500 word essay on what you have learned.

**nursing**

List three key staff of a public health department other than the community or public health nurse.

**Spanish-8th grade**

This is in regard to my earlier post about the conversation- Thank you for all your help.Thank you for your patience too Could you recheck this? I don't understand about who talks much-my number 10 but I think you put it at #9You said it was the brother not the person but ...

**Spanish -Sra Please recheck **

Thank you for all your help.Thank you for your patience too Could you recheck this? I don't understand about who talks much-my number 10 but I think you put it at #9You said it was the brother not the person but I'm confused why it states me and then habla-doesn't ...

**Spanish 8th grade**

I have to read this and answer these questions for homeowrk-I'm not sure if I did this correctly. Could you please check-I put the reading and then questions and my answers under it-thank uyou for checking-I'm really not sure about my answers-I'm a little confused ...

**Spanish-8th grade**

We're learning direct object pronouns so I had to replace the "sellos" in the first sentence-did I do it correctly? Tú coleccionas sellos. Tú los coleccionas.

**math**

What is the standard notation for 3 to the 3rd power

**algebra**

simplify 14a^8y^3-7a^4y^5+28a^12y^2/7a^4y

**Math-Calc**

The lim as x goes to 0- for cos(x)/sin(x). I know the answer is negative infinity but I don't really understand why.

**Calculus**

A rectangle is inscribed with its base on the x axis and its upper corners on the parabola y= 12 - x^2. What are the dimensions of such a rectangle with the greatest possible area?

**algebra**

One jar holds 16 red marbles and 4 blue marbles. A second jar holds 75 white marbles and 25 blue marbles. What is the probability that a blue marble will be drawn from both jars?