Lex
Popular questions and responses by Lex
Calculus
A rectangular field is to be enclosed by a fence and divided into three lots by fences parallel to one of the sides. Find the dimensions of the largest field that can be enclosed with 800 feet of fencing. Help me please!!!!!!!!!!! THANK YOU
asked on October 18, 2014 
Physics
A 9 kg hanging weight is connected by a string over a pulley to a 5 kg block sliding on a flat table. If the coefficient of sliding friction is 0.2, find the tension in the string.
asked on April 15, 2013 
Math
A fraction has a value 2/3. If 4 is added to the numerator and the denominator is decreased by 2, the resulting fractions have the value 6/7. What is the original fraction? (Let x be the numerator and y be the denominator)
asked on November 24, 2015 
math
a guy wire is 15m long. it supports a vertical television tower. the wire is fastened to the ground 9.6m out from the base of the tower a) calculate the angle formed by the guy wire and the ground b) calculate how far up the tower the guy wire attacks
asked on January 20, 2017 
Chem
How many carbon atoms are contained in each of the following number of moles: (a) 1.40 mol; (b) 5.70 mol?
asked on February 17, 2017 
analytic geometry
The segment joining (1,4), (2,2) is extended three times its own length. Find the terminal points.
asked on July 14, 2013 
science
if you place a dime penny and quarter on a spinning turntable which coin has a greater speed than the penny than the penny
asked on February 12, 2011 
Chemistry
Bacterial digestion is an economical method of sewage treatment. The reaction 5CO2(g) + 55NH4+(aq) + 76O2(g) bacteria> C5H7O2N(s)[bacterial tissue] + 54NO2(aq) + 52H2O(l) + 109H+(aq) is an intermediate step in the conversion of the nitrogen in organic
asked on August 27, 2008 
CHEM
2H2+O2=2H2O H=484KJ Which answer best describes the transfer of heat that occurs when 1.41 mol of H2 reacts with 0.671 mol of O2? 341 kJ released 484 kJ released 341 kJ absorbed 484 kJ absorbed 325 kJ released 325 kJ absorbed
asked on April 13, 2016 
physics
As your hand moves back and forth to generate longitudinal pulses in a spiral spring, your hand completes 3.26 backandforth cycles every 8.31 s. The velocity of the pulse in the spring is 1.47 cm/s.
asked on March 24, 2013 
math
the expression 6 times radical 20 divided by 3 times radical 5 is equvilent to 1. 3 radical 15 2. 2 radical 15 3. 8 4. 4
asked on October 19, 2011 
trig
I need help on these problems: Find the exact value of tan(23pi/6) also, Find the reference angle in radians and degrees for (34pi/18) please help walk me through these.
asked on October 4, 2009 
Calculus
The function f(x)=(6x+1) e^4x has one critical number. Find it I know how to solve this kind of equation; however, I never solved one with a binomial. How will can I factor this when working out the equation?
asked on March 27, 2019 
Chemistry
Determine the mass in grams of glucose (180.2 g/mol) needed to prepare a solution with a vapor pressure of 40.8 mmHg. The glucose is dissolved in 575g of water at 35C. The vapor pressure of pure water at 35C is 42.2 mmHg. Please help me, I don't know what
asked on March 25, 2019 
Genetics
1. What is the difference in composition between the prokaryotic (E. coli) core polymerase and holoenzyme? How does the E. coli RNA polymerases find the correct place to start transcription from a gene
asked on November 13, 2017 
chem
A sample of oxygen at 32◦C occupies 340 mL. If this sample later occupies 1064 mL at 57◦C and 1.2 atm, what was its original pressure?
asked on November 30, 2016 
science
Potassium40 has a half life of 1.2 billion years and decays into the stable daughter isotope Argon40. If you find a rock that contains 20 Potassium40 atoms and 60 Argon40 atoms, how old is the rock?
asked on October 25, 2016 
physics
A bead slides on the frictionless wire as shown in the figure attached. If the speed of the beead is 2.0 m/s when its at A, how fast will the bead be going at point B and at point C?
asked on September 22, 2016 
Math
If I have $135 and I put 3/8 of it away in savings, how much do I have left to spend? I tried doing division, but I got 360 and I can't think of any other equations..
asked on May 12, 2016 
Math
10(11) Would this be 110 ? I know a negative times a negative should be a positive but does this change when the second number is inside the ( )
asked on May 2, 2016 
chemistry
When you add 0.567 g of sodium metal to an excess of hydrochloric acid, you find that 5890 J of heat are produced. What is the enthalpy of the reaction as written below? 2Na(s)+2HCl(aq)=2NaCl(aq)+H2(g)
asked on April 13, 2016 
CHEMESTRY
Calculate how many grams of O2(g) can be produced from heating 65.8 grams of KClO3(s).
asked on April 13, 2016 
science
Combining 0.280 mol of Fe2O3 with excess carbon produced 19.4 g of Fe.
asked on April 13, 2016 
chemestry
Given the following chemical equation, determine how many grams of N2 are produced by 9.72 g of H2O2 and 6.53 g of N2H4
asked on April 13, 2016 
Math
Find the value of k so that each trinomial is a perfect square 49d^256d+k
asked on November 1, 2015 
Algebra. Help me please!
Andrew decides to wait until age 65 to begin receiving social security benefits. Find the present value of his estimated $26,000 per year in payment assuming 6%per year and payment until his 90th birthday. A. $265,263.20 B. $322,3667.36 C. $338,082.42 D.
asked on April 23, 2015 
math
A woman added 376 ml of liquid gasoline additive to the 17.4L of gasoline in her car's tank. Find the total amount of liquid in the tank. There are now _L of liquid in the tank.
asked on November 29, 2014 
math
The bottom portion of a loading bin is cone shaped. The base radius of this part of the bin is 3.5 feet and the slant height is 6.5 feet. What is the capacity and lateral surface area of this part of the bin? Round your answer to the nearest hundredth.
asked on April 24, 2014 
computer science
a) What is the largest positive number that can be represented in 12 bits using one’s complement? Represent the number in bits and decimal as well. Assume the first bit is the sign bit. (2 marks)
asked on March 23, 2014 
CS programing
Storage: .data 2 0 ; storage for n22 .data 2 0 ; temp storage 23 .data 2 2 ; constant 2 24 .data 2 2 ; const 2 25 0 10 ;const 10 26 please can u show me the correct way to declare a constant using wombat.(CPU sim).
asked on March 20, 2014 
finance
adams enterprises noncallable bonds currently sell for $1030. they have a 15 year maturity, an annual coupon of $85, and par value of $1000. what is their yeild of maturity? a) 9.53% b) 8.15% c) 8.88% d) 8.55 % e) 7.41%
asked on November 2, 2013 
Math
Kate Alexander worked 40 hours last week. Her pay rate is $8.50 per hour. Assuming 7.65% social security withholding, how much should her employer withhold from her check for social security?
asked on September 10, 2013 
math
What is the portion if the base is 900 and the rate is 12 3/4?
asked on May 14, 2013 
Physics
Two large, parallel, conducting plates are 20 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 3.0 1015 N acts on an electron placed anywhere between the two plates. (Neglect fringing.) a)
asked on April 27, 2013 
math 115
C(x)=450x+5000, R(x)=3x^2+900x for 20
asked on April 26, 2013 
Physics
17. Potential due to a point charge: What is the electric potential 17.0 cm from a 3.50 μC point charge?
asked on April 25, 2013 
Physics
17. A 5.6 kg toy race car moves along an x axis. The diagram below shows the force acting on the car. (The vertical axis is marked in increments of 2 N.) a) What is the momentum of the car at t = 9.0 s b) What is the car's velocity at t = 9.0 s? The graph
asked on April 18, 2013 
math
Martha sees 9 animals in the pet store..4rabbits an 5 cats...what fraction shows how many cats
asked on April 10, 2013 
math
We have four apples I eat one what fraction shows how many apples are left
asked on April 10, 2013 
chemistry
3. Based on your answer in question 2, determine the percent error of your calculated specific heat capacity value of your unknown metal using the specific heat capacities of known metals below. Metal Specific Heat Capacity Nickel 0.440 Tin 0.210 Silver
asked on April 4, 2013 
English 1/ or literature
What is a example of a understatement in the cask of amontillado.? I know a understatement is a form of speech which contains an expression of less strength than what would be expected. I really need help with this. Thanks :)
asked on January 28, 2013 
chemistry
Porassium alum is 3.9 parts per 100 parts of water. Knowing this, how many moles of potassium alum are present in 50ml?
asked on October 19, 2012 
math
Tom made pieces of string that were 5/6 yards long. He made 30 pieces. How many yards did he intially have?
asked on May 29, 2012 
Geometry
An isosceles triangle has area of 125 ft2. If the base is 14 ft, what is the length of each leg? Round your answer to the nearest tenth.
asked on May 25, 2012 
English  Poetry
I'm doing a Tritina style poem for my English class and I'm doing the envoy now but I'm not sure how I could use the 3 words: twinkle/twinkling, rosy, and sleepy. And it has to relate to babies and the bond between them and their mothers and emotional
asked on May 24, 2012 
English HELP.
My topic for my pursuasive essay in English is "Dogs are Smarter than cats", I need legitimate facts about this because whenever I do research it only shows "facts" without good resources or they're just biased, from most of my google searches. I'd also
asked on May 21, 2012 
Geometry/Math again!
The base of a prism is a regular hexagon that measures 4 cm on each side. The prism has a height of 13 cm. What is its total surface area?
asked on May 21, 2012 
Geometry
A rectangular pyramid fits exactly on top of a rectangular prism. Find the volume of the composite space figure if the prism has length 19 cm, width 2 cm, height 11 cm, and the pyramid has height 7 cm.
asked on May 21, 2012 
Geometry/Math
Calculate the volume to the nearest tenth of a 6.3m cube with a hole 2 m in diameter drilled through it. Use 3.14 for pi.
asked on May 21, 2012 
Chemistry
What is a glucose molecule structure made up of? Is it: oxygen, hydroxl ions, hydrogen ions, and carbon bonds? I'm not good at this, is this even close to being right?
asked on March 22, 2012 
I'm in desperate need of h
I'm in desperate need of help for a huge titration lab and finding the molarity. if I give you the problem could you help?
asked on April 29, 2011 
College algebra
suppose you invest 2500 and earn 4.2% annual interest, compounded quarterly. how long will it tak for your investment to double?
asked on March 7, 2011 
science
The turntable below is spinning. Which coin has a greater speed than the penny? a. the dime b. the quarter c. The penny is moving faster than both of the other coins. c. All three objects are moving at the same speed. pennyis closest to center dime in
asked on February 13, 2011 
science
When the electrons are aligned in the magnetic domains of two materials,what occurs what is it called
asked on February 12, 2011 
science
true or false:: When the electrons are aligned in the magnetic domains of two materials, magnetization can occur.
asked on February 12, 2011 
science
Max turns the handle on a pencil sharpener. This turns the wheel that turns the blades. The blades sharpen the pencil. In this situation, what is the input force?
asked on February 12, 2011 
physics
Which type of wave would be beneficial to a surfer?
asked on February 11, 2011 
science
if you have a 343 J of kinetic energy at the lowest point of a pendulum's swing and at the highest point has a height of 5 m what is the pendulum's mass
asked on February 11, 2011 
spanish
what is "Nada menos que todo un hombre" about?
asked on December 29, 2010 
spanish
what does: Les piden uds mas tarea a los profesores? mean
asked on December 29, 2010 
us history
How were the governors of the Pennsylvania colony chosen?
asked on September 27, 2010 
3rd grade
when subtracting 288 from 506 how would thinking of 500 as 50 tens help you?
asked on January 19, 2010 
algebra
x^2+4x/5x^3+20x^2 * 10x40/x^216
asked on October 20, 2009 
math
wwhat is the answer to x+7y=14
asked on July 26, 2009 
Grammar
When learning pronoun case (subjective pronoun,objective,possessive) do I need to just memorize the list? I am having trouble identifying them. Any help please. I am in 5th grade. I recommend memorize, using homemade flash cards. It wont take long to
asked on February 14, 2007

ELA
You guys should go on enotes. It gives a pretty good idea of what your reading about and could help some of y’all who didn’t read the book🙊
posted on May 14, 2020 
Chemistry Pretest
32
posted on April 28, 2020 
math
so who's right yall are all confusing me like be serious.
posted on March 25, 2020 
ELA
On U2 L19 the test are different for some people. My friend in the same grade as me had different questions.
posted on March 19, 2020 
Social Studies
shadow i hope you know you actually made it very confusing.
posted on March 17, 2020 
Calculus
Thank you so much, I now understand where I went wrong at first!
posted on March 27, 2019 
English check
it's b
posted on February 17, 2019 
Spanish
correct
posted on September 28, 2018 
Spanish
Yup she is
posted on September 10, 2018 
ALGEBRA
Thx he/she is all correct :)
posted on September 10, 2018 
HealthCheck my answers
100% The best way to describe fitness being slim and low in body fat being big, strong, and buffed being flexible and having a sense of overall wellbeing The best way to describe wellness making positive choices Before embarking on a physical exercise
posted on September 3, 2018 
algebra 1
360
posted on June 17, 2018 
english
Is this for honors?^
posted on June 6, 2018 
geometry
Thank you
posted on May 15, 2018 
Health
B C B A A 5/5 (100%)
posted on April 25, 2018 
Career
Thank you
posted on March 15, 2018 
Science
is it for the connections academy answers
posted on October 10, 2017 
Algebra 1B
You both are Wong smh
posted on April 5, 2017 
Organic Chemistry
1.85
posted on March 13, 2017 
RIDDLE
Mara because the letter i is not thereLex
posted on October 29, 2016 
Science Help Plzz
Thanks morgan!!
posted on June 17, 2016 
Math
Ohhh okay! Thank you! I got: 84.38, so yeah that makes total sense. Thanks!!
posted on May 12, 2016 
chemistry
477848.3?
posted on April 13, 2016 
chemestry
2H2O2(l)+N2H4(l)=4H2O(g)+N2(g)
posted on April 13, 2016 
Algebra
The answer is B. 44 quarters+40 nickels=84 coins (0.25*44)=$11 (0.05*40)=$2 11+2=$13
posted on April 2, 2016 
health
Hell yeah son!
posted on February 2, 2016 
AP world history help
I. there was no painful initiation rite
posted on October 24, 2015 
health
it's b
posted on November 21, 2014 
Physics
1.728J
posted on October 17, 2014 
Algebra 2
There are 2 leave along 3 in of an ivy vine. there are 14 leaves along 15 in of the same vine. How many leaves are there along 6 in of the vine?
posted on September 11, 2013 
Physics
Anyone please?
posted on May 12, 2013 
Physics
I meant to say the negative sign in the equation. And Thank you very much.
posted on April 25, 2013 
Physics
So because of the negative sign in the question would the answer end up being negative?
posted on April 25, 2013 
math
Thank u don't understand fractions yet sue... u r so kind
posted on April 10, 2013 
math
5/9
posted on April 10, 2013