# Posts by chen

Total # Posts: 63

**Math**

Sammy has a 10-foot ladder, which he needs to climb to reach the roof of his house. The roof is 12 feet above the ground. The base of the ladder must be at least 1.5 feet from the base of the house. How far is it from the top of the ladder to the edge of the roof? I am ...

**Physics**

thanks

**Physics**

the center of gravity of a 100-g stick is located at 50 cm mark and the stick is supported at 60cm. mark, Where must an 80g object be hung in order to have equilibrium?

**Chemistry**

The boiling point of alcohol is 78.3 degrees Celcius at 760 mm atm pressure. Would the boiling point be higher or lower than 78.3 degree Celcius at hugher altirudes? Why?

**Chemistry**

A solution is 0.10M in aqueous NH3. Calculate (a) the number of moles and (b) the number of grams of NH4Cl that must be added to 500mL of this solution to prepare a buffer solution with pH=9.15. You may neglect the volume change due to addition of solid NH4Cl. Kb=1.8x10^-5. (...

**science**

A body of mass m=2.6 kg is standing on a ramp inclined in an angle of α=14.9 degrees. The static friction coefficient between the ramp and the body is μ=0.29. The ramp, which is inclined to the left, is in a train, which accelerates to the right. What is the minimal ...

**Math (Statistics)**

jean has an IQ that corresponds to 81% percentile rank. if there are 21 girls in the group, how many of them have an higher IQ than Jean? thanks...:)

**math**

solve each equation.write each equation in simplest form 7x/8=21 a.24 b.18.375 c.1.857 d.19

**Math**

The passenger bus starts out and travels at 65 kilometers per hour. three hours later, a car starts out from the same place and overtakes the bus in 8 hours and 40 minutes. what is the rate of the car?

**Math**

solve by substitution x+y=5 x+y=3

**Math**

1. if the largest of three consecutive even integers is multiplied by 5, the product is 6 less than three times the sum of the first two integer. fin the integers.

**Math**

1. find the two consecutive number such that five-eights of the smaller number equals three-fifths of the larger number. 2. separate 221 into two parts such that their quotient is 8/9. thanks...

**Chemistry**

You pass a road sign saying "New York 112 km." If you drive at a constant speed of 65 mi/h, how long should it take you to reach New York? If your car gets 28 miles to the gallon, how many liters of gasoline are necessary to travel 112 km?

**Chemistry**

Thank you very much.God bless

**Chemistry**

If your car gets 28 miles to the gallon, how many liters of gasoline are necessary to travel 112km? I need the answers so badly. Thank you very much.

**Algebra**

Thanks alot .

**Algebra**

Please simplify. 1.) (c^-3)^2d^4/d^-2= 2.)(e^4)^-3f^-5/f^-2= 3.)(8^-7/8)^-2= thank you. :)

**Algebra**

Thank you thank you. (*^_^*)

**Algebra**

express using positive exponents. simplify each. please (-5c^-3)^4=? thank you

**physics**

1. While strolling along on unknown planet, an astronaut decides to throw a hammer and a feather upwards at 5.0 m/s. They both return to the point of release in 3.0 s. What is the acceleration due to gravity on Planet X. 2. Marii jumps straight upward at 15.0 m/s. How high is ...

**math**

Thanks... :)

**math**

The line segment joining ( -3,-4) and (6,11) is to be divided in to three (3) equal parts. Find the coordinates of the point of the part closest to (-3,-4). Please help me..

**English/grammar**

thanks :)

**English/grammar**

please find the error: 1. To whom is this wallet that was found in the room yesterday? 2. A man with five children have a large family to support. thanks... :)

**math**

Thank you very much. :)

**math**

ah.. in the unit circle i think!

**math**

following

**math**

please find the ordered pair of the ff: 1.) 30 degrees 2.)60 degrees thanks... :)

**math**

What is the factor of x^2+8x+8. thanks...

**math**

thanks a lot... :)

**math**

Find the x-intercept and y-intercept (zeroes of the function) 1.) P(x)=x^4- 9x^2 2.) P(x)= 2(x-5)(x+2)^2

**math**

thanks.. :)

**math**

find the base of the exponential function whose graph contains the given points. 1.( 4, 1/625) 2.(3/2, 27) 3.(3, 1/343)

**math**

list all the possible integral zeros: P(x)= x^3-2x^2-11x+12

**math**

please anwer these: 1) how can i multiply and divide polynomials containing radicals? 2) how can i solve radical equations? 3) how can i solve qudratic equations by factoring ? 4) how can i solve quadratic equations graphically ? thank you !!!!!

**math**

how many factors does this polynomial has? please.. i really need your answers. asap!

**math**

can you give me two more factors please.... i've already tried numbers 9 to 25.

**math**

please find it's factors 2x^3+5x^2+4x+1 thanks

**physics**

thanks mate...

**physics**

Compare the work that a 22-kW car engine does in 60 seconds if its efficiency changes from 100% to 75%.

**science**

1.) what energy transformation are taking place when a ball is dropped from 1.0 m, bounces and tries to 0.80 m, bounces again and rises to 0.64m? What is the efficiency of the energy transformations of ball during a bounce?

**physics**

A cart of mass m = 1.10 kg on a track undergoes a collision with another cart. It's velocity before and after the collision, vi and vf is measured and found to be vi = 2.12¡À0.06 m/s and vf = 0.60¡À0.08 m/s. Calculate the following quantities ...

**calculus**

At midnight, ship B was 90 km due south of ship A. Ship A sailed east at 15 km/hr and ship B sailed north at 20 km/hr. At what time were they closest together?

**calculus**

At midnight, ship B was 90 km due south of ship A. Ship A sailed east at 15 km/hr and ship B sailed north at 20 km/hr. At what time were they closest together?

**physics**

at what inclination should the object be released from rest if it is to reach a maximum horizontal distance of 2m as shown. coeff of friction is 0.37 for all surfaces of contact.

**Math**

the measure of an angle is 27 less than twice the measure of it complement.Find the measure of each angle what would the equation be

**Math**

A new quarterback has to pick two number that will go on his football shirt. How many pair of number can be make from the digits 3,5,7,and 9? What are all the possible choice?Explain how you arrived at your answer.

**Chemistry**

A student conducts an experiment to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 °C, in an open polystyrene ...

**Chemistry**

A student conducts an experiment to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 °C, in an open polystyrene ...

**algebra**

-7|2x+21|-7=42 set notation and solution

**Caculus**

integrate x^(1/2)e^x.dx from 0 to 4, n=12 1) the trapezoidal rule

**computers**

organize the documents into folders based on there topic aor type. :) hope this helped

**12th grade**

this is not possible because 3x and 3 are not like terms. in order to add you must have like terms. :)

**home economics**

home economics are simple things around the house like cleaning, cooking, ect.

**home economics**

cambells

**Management**

I am collecting ideas for the following question. Any help would be appreciated, thanks. Please give an example of good or bad management control based on your own experience.

**french**

It means "will you give me a present for my sisters birthday?" also in response to SraJMcGin, "anniversaire" never refers to the word anniversary on the word birthday

**government and economic**

banker, doctors, corporation presidents, and wall street lawyers (the traditional elite) veruss government officials, research scientists, professors, and the mass media. Which group would benefit most from each of the following developments? - Large-scale nationalization of ...

**stupid test online**

celery!

**How to send gifts to China in a strange country?**

The Thanksgiving Day is coming. Do you have some ideas about it? For western people, it is more important than us Asian. But this kind of custom influences us gradually. So, this Thanksgiving Day I want to send some interesting gifts to my families, friends and others in order...

**english**

In the book "The English Patient".Why did Hana decide to have an abortion during the war? How has that decision affected her, and how much influence has it had on her life at the villa? umm read the book

**english**

In the Book, "the English patient".What can you deduce from the novel about Hana's relationship with her father? Has her father's death, and the manner of it, caused her to retreat from the war and devote herself to the English patient? What influence do her ...

**english**

In the book "The English Patient",The English patient "whispers again, dragging the listening heart of the young nurse beside him to wherever his mind is, into that well of memory he kept plunging into during those months before he died" [p. 4]. Why does ...

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