# Lex

Popular questions and responses by Lex
1. ## 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

2. ## 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.

3. ## 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)

4. ## 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

5. ## Chem

How many carbon atoms are contained in each of the following number of moles: (a) 1.40 mol; (b) 5.70 mol?

6. ## analytic geometry

The segment joining (-1,4), (2,-2) is extended three times its own length. Find the terminal points.

7. ## 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

8. ## 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

9. ## 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

10. ## physics

As your hand moves back and forth to generate longitudinal pulses in a spiral spring, your hand completes 3.26 back-and-forth cycles every 8.31 s. The velocity of the pulse in the spring is 1.47 cm/s.

11. ## 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

12. ## 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.

13. ## 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?

14. ## 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

15. ## 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

16. ## 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?

17. ## science

Potassium-40 has a half life of 1.2 billion years and decays into the stable daughter isotope Argon-40. If you find a rock that contains 20 Potassium-40 atoms and 60 Argon-40 atoms, how old is the rock?

18. ## 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?

19. ## 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..

20. ## 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 ( )

21. ## 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)

22. ## CHEMESTRY

Calculate how many grams of O2(g) can be produced from heating 65.8 grams of KClO3(s).

23. ## science

Combining 0.280 mol of Fe2O3 with excess carbon produced 19.4 g of Fe.

24. ## 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

25. ## Math

Find the value of k so that each trinomial is a perfect square 49d^2-56d+k

26. ## 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.

27. ## 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.

28. ## 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.

29. ## 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)

30. ## 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).

31. ## 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%

32. ## 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?

33. ## math

What is the portion if the base is 900 and the rate is 12 3/4?

34. ## 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 10-15 N acts on an electron placed anywhere between the two plates. (Neglect fringing.) a)

35. ## math 115

C(x)=450x+5000, R(x)=-3x^2+900x for 20

36. ## Physics

17. Potential due to a point charge: What is the electric potential 17.0 cm from a 3.50 μC point charge?

37. ## 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

38. ## math

Martha sees 9 animals in the pet store..4rabbits an 5 cats...what fraction shows how many cats

39. ## math

We have four apples I eat one what fraction shows how many apples are left

40. ## 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

41. ## 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 :)

42. ## chemistry

Porassium alum is 3.9 parts per 100 parts of water. Knowing this, how many moles of potassium alum are present in 50ml?

43. ## math

Tom made pieces of string that were 5/6 yards long. He made 30 pieces. How many yards did he intially have?

44. ## 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.

45. ## 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

46. ## 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

47. ## 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?

48. ## 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.

49. ## Geometry/Math

Calculate the volume to the nearest tenth of a 6.3-m cube with a hole 2 m in diameter drilled through it. Use 3.14 for pi.

50. ## 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?

51. ## 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?

52. ## College algebra

suppose you invest 2500 and earn 4.2% annual interest, compounded quarterly. how long will it tak for your investment to double?

53. ## 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

54. ## science

When the electrons are aligned in the magnetic domains of two materials,what occurs- what is it called

55. ## science

true or false:: When the electrons are aligned in the magnetic domains of two materials, magnetization can occur.

56. ## 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?

57. ## physics

Which type of wave would be beneficial to a surfer?

58. ## 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

60. ## spanish

what does: Les piden uds mas tarea a los profesores? mean

61. ## us history

How were the governors of the Pennsylvania colony chosen?

when subtracting 288 from 506 how would thinking of 500 as 50 tens help you?

63. ## algebra

x^2+4x/5x^3+20x^2 * 10x-40/x^2-16

64. ## math

wwhat is the answer to x+7y=14

65. ## 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

1. ## 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
2. ## Chemistry Pretest

32

posted on April 28, 2020
3. ## math

so who's right yall are all confusing me like be serious.

posted on March 25, 2020
4. ## 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
5. ## Social Studies

posted on March 17, 2020
6. ## Calculus

Thank you so much, I now understand where I went wrong at first!

posted on March 27, 2019
7. ## English check

it's b

posted on February 17, 2019
8. ## Spanish

correct

posted on September 28, 2018
9. ## Spanish

Yup she is

posted on September 10, 2018
10. ## ALGEBRA

Thx he/she is all correct :)

posted on September 10, 2018

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 well-being The best way to describe wellness making positive choices Before embarking on a physical exercise

posted on September 3, 2018
12. ## algebra 1

360

posted on June 17, 2018
13. ## english

Is this for honors?^

posted on June 6, 2018
14. ## geometry

Thank you

posted on May 15, 2018
15. ## Health

B C B A A 5/5 (100%)

posted on April 25, 2018
16. ## Career

Thank you

posted on March 15, 2018
17. ## Science

posted on October 10, 2017
18. ## Algebra 1B

You both are Wong smh

posted on April 5, 2017
19. ## Organic Chemistry

-1.85

posted on March 13, 2017
20. ## RIDDLE

Mara because the letter i is not there-Lex

posted on October 29, 2016
21. ## Science Help Plzz

Thanks morgan!!

posted on June 17, 2016
22. ## Math

Ohhh okay! Thank you! I got: 84.38, so yeah that makes total sense. Thanks!!

posted on May 12, 2016
23. ## chemistry

477848.3?

posted on April 13, 2016
24. ## chemestry

2H2O2(l)+N2H4(l)=4H2O(g)+N2(g)

posted on April 13, 2016
25. ## 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
26. ## health

Hell yeah son!

posted on February 2, 2016
27. ## AP world history help

I. there was no painful initiation rite

posted on October 24, 2015
28. ## health

it's b

posted on November 21, 2014
29. ## Physics

1.728J

posted on October 17, 2014
30. ## 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
31. ## Physics

posted on May 12, 2013
32. ## Physics

I meant to say the negative sign in the equation. And Thank you very much.

posted on April 25, 2013