# benjamin

Popular questions and responses by benjamin
1. ## Calculus

Find a cubic function f(x) = ax^3 + bx^2 + cx + d that has a local maximum value of 3 at x = −2 and a local minimum value of 0 at x = 1.

2. ## physics(kinematics)

A police officer in a patrol car parked in a 70 Km/h speed zone observes a passing automobile might be intoxicated,the officer starts his car,accelerates uniformly to 90 Km/h in 8s ,and maintaining a constant velocity of 90 Km/h,overtakes the motorist 42s

3. ## physics

Vector A has a magnitude of 8.00 units and makes an angle of 45.0° with the positive x-axis. Vector B also has a magnitude of 8.00 units and is directed along the negative x-axis. Using graphical methods, find (a) the vector sum A + B and (b) the vector

4. ## CHEM, HELP!!

1. If the energy of a photon is 1.32 × 10^-18 J, what is its wavelength in nm? 2. The energy of an electron in the hydrogen atom is determined by what?

5. ## physics(capacitors)

A sheet of paper 40mm wide and (1.5 x 10^-2) thick is placed between a metal foil of the same width is used to make a 2.0 UF capacitor. If the dielctric constant(relative permitivity of the paper is 2.5 ,what length of paper is required?

6. ## maths

The area of a rectangle is 60 cm squared and its perimeter is 38cm. Find the length and width of a lectangle

7. ## Math

A fence is to be built to enclose a rectangular area of 310 square feet. The fence along three sides is to be made of material that costs 3 dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the dimensions of the

8. ## Stats

A sociology professor assigns letter grades on a test according to the following scheme. A: Top 14% of scores B: scores below the top 14% and above the bottom 55% C: scores below the top 45% and above the bottom 17% D: scores below the top 83% and above

9. ## Maths

the second term of a GP is 36 more than the first term. The difference between the 4th and the 3rd terms is 900. Calculate the common ratio and the first term of the GP

10. ## physics(lens)

Two converging lenses, A and B,with focal length F1=20cm and F2=25cm,are placed 80cm apart. An object is placed F0cm in front of the first lens. 1)Determine the position of the final image formed by the magnification of the two lenses. 2)Determine the

11. ## Physics

A typical photovoltaic cell delivers 4.2×10−3 W of electric energy when illuminated with 0.15 W of light energy. What is the efficiency of the cell?

12. ## physics(lens)

Two converging lenses, A and B,with focal length F1=20cm and F2=25cm,are placed 80cm apart. An object is placed F0cm in front of the first lens. 1)Determine the position of the final image formed by the magnification of the two lenses. 2)Determine the

13. ## physics

What gravitational force does the moon produce on the Earth if their centers are 3.88x108 m apart and the moon has a mass of 7.34x1022 kg? earths mass: 5.972 × 10^24 kg

14. ## math

Sound travels at 343 meters per second. You measured 3 seconds for sound travel from place A to place B. What is the distance between A and B?

15. ## Geometry

On a coordinate grid map jaff's house is located at (9,5.). Hannah's house is at (-5,-5). Kenya's house is at the midpoint between Jeff and Hannah's. what's the distance.

16. ## Chemistry

For the reaction of 2 HCl + Na2CO3 -> H2O + CO2 + 2 NaCl, how can I visually identify the limiting reagent, without any calculations? If I have a very high percent yield, what would be a good reason for it, considering that the HCl was diluted to 0.050 L

17. ## Physics

Plz, i need the workings. An object is acted upon by two forces of 5N and 12N. Calculate the resultant of two forces if the forces acting perpendicular to each other

18. ## science

two parallel plates are separated by a dielectric of thickness 2mm and a dielectric of constant 6.if the area of each plate is 40cm2 and p.d between them is 1.5kv,find the capacitance,the energy stored by the capacitor and the ratio of the capacitance if

19. ## Satistics

In North American, female adult heights are approximately normal with a mean of 65 inches and a standard deviation of 3.5 inches. a.) If one female is selected at Random, what is the probablility that shes has a height 70 inches or higher? b.) The heights

20. ## History

About the French Revolution. You are a member of the Third Estate. Prepare a speech for the meeting of the Estates General, explaining all your problems. Minimum 300 words

21. ## physics

How far from the earth’s surface would a 72.1kg person experience a force of1.6 Newtons?

22. ## Physics

A girl throws a marshmallow that lands in her friend’s mouth 2 m away. The girl threw the marshmallow at an angle of 30 degrees. How hard did she throw the marshmallow?

23. ## Physics

A tennis ball is dropped from 1.98 m above the ground. It rebounds to a height of 1.05 m. With what velocity does it hit the ground? The acceleration of gravity is 9.8 m/s2 . (Let down be negative.) Answer in units of m/s Confused please help.

24. ## Math

The radii and angle substended at the center of circle are given as follow 12cm,40

25. ## Math

Mr. Anderson has a rectangular yard that is 27 yards long and 25 feet wide. How many square feet of grass must Mr. Anderson mow?

26. ## Chemistry

An 0.850 g sample of a mixture of LiH and CaH2 was reacted with H2O and the H2 gas produced, 1.20 L, was collected at STP. What mass % of the original mixture was LiH?

27. ## Math

One day at 3 am., the temperature was -13 Fahrenheit in Kodiak, Alaska. At 10 am the temperature was 22 Fahrenheit What was the average change in temperature per hour?

28. ## Chemistry

In this reaction: 2 HCl + Na2CO3 -> H2O + CO2 + 2 NaCl The HCl was diluted from 2M to 0.8M and I currently have 0.020 L of it. There is also Na2CO3. What would be four causes for a large error percentage? Is it possible that some of the HCl evaporated?

29. ## precalculus

How do you find the major and minor axis of an ellipse?

30. ## precalculus

can you explain what the equation y = a(x - h)2 + k, a ≠ 0 means and what it represents?

31. ## Algebra

Your test scores in one class are 8484 and 88. What possible scores can you earn on your next test to have a test average between 86 and 90​, ​inclusive

32. ## Math

If q^1/2 = x, x^-1/4 = 4^-1/2, what is the value of q? Plz help me!

33. ## Physics

A uniform rod 2m long has a force 80N applied downward at one end. Another force 6N applied downward at the other end. At what point under the rod should the pivot be placed to keep it in equillibrim?

34. ## engineering

important of ict in electrical studies

35. ## Math algebra

If a mixture calls for 3 cups of flour to 2 cups of water. Then how much water is needed for only 2 cups flour??

out of 7 men and 5 women, 5 members of a committee are selected. in how many ways can this be done if (a) there must be exactly 3 men (b) there must be more women than men?

37. ## Statistics

90% of population is unemployed. Assume 10 employable people are to be selected randomly. what is the expected number of those unemployed.

38. ## physics(measurement)

What accurate method can be used to determine the thickness of a coin. Explain pls..

39. ## physics

a cell of emf 10v and internal resistance 2ohms is connected in series with an ammeter resistance 0.5ohms and a load of resistance 7ohms. Calculate (A) the potential difference across its terminal (B)the voltage drop

40. ## science

suppose 125g of ethanol at 25C is mixed with 255g of ethanol at 84C at constant atmospheric pressure in a thermally insulated vessel. What is the Ssys for the process. The specific heat capacity for ethanol is 2.42 J/g K. Answer in units of J/K

41. ## science

A point charge of 0.5C is brought from infinity to a point A in free space.how much work is required to this?

42. ## Community technical college

Given that 1st term of an A.P is 7 and it's 10th term is twice the second term,calculate the (a) 19th term (b)sum of 28 terms (c) difference between 9th and 6th terms

43. ## math

if i ride my bike for 5.22 km and my whell turns 1.45 m how many times will it rotat

44. ## geometry

i have to proof that segment ad is congruent to segment ce. my givens are that segment ab is congruent to cb, that fd bisects ab and that fe bisects cb. the shape is a triangle

45. ## collage math

what is the difference of two cubes

46. ## university of phoenix

if someone scored two standard deviations above the mean on a standard test where the mean =100 and the standard deviation = 15, what is the person's numerical score?

47. ## Algebra

What do I do if a compound inequality contradicts itself? Do I put down empty set, or what?

48. ## math

Find the angles of atriangle which are in the ratio 2:3:5. Could someone explain how to do this also. Thanks.

49. ## ISB

Find the angles of atriangle which are in the ratio 2:3:5. Could someone explain how to do this also. Thnaks.

50. ## math

In a right angle triangle, two acute angles are in the ratio 2:3. Find the angles?

51. ## English

I was wondering what you all may think about video games and their effects on children playing them? Are the children becoming more violent? What do these games do t a child's psyche?

52. ## Physics

An airplane, traveling 90 degrees, at 100 meters per second is blown towards 180 degrees at 50 meters per second. What is the resultant velocity and direction?

53. ## Math

Find the difference of all the prime numbers between10 and25 arranged in descending and ascending order.Give your answer in words.

54. ## math

Find the GCD OF 121, 151 And 211

55. ## Math (difficult)

The value of a new car purchased for \$28,000 decreases 8% per year. Write an exponential decay model for the value of the car. Use the model to estimate the value after 5 years.

56. ## algebra II

Using the given equations, find the point of intersection. 6x - 2y = 5 and 3x - y = 10

57. ## college HIST

The Age of Jackson is often seen as a turning point in American politics, one where we turn from a politics where few could vote or hold office to one where many could. Define Jacksonian Democracy and show how it changed the political system from what came

58. ## geometry

to the nearest integer how long is the diagonal square with the side of 12

A mixture contains solids: Aluminium,camphor and sugar.Explain how you would obtain a sample of solid sugar from the mixture.

60. ## Algebra

There is a table of values for the function f. They read: x=3, f(x)=4 x=4 f(x)=5 x=5 f(x)=6 x=6 f(x)=3 x=7 f(x)=5 x=8 f(x)=7 What is the value of 2f(5)-f(4)? I did this wrong obviously, but what I did was figure out the function of five from the table (4),

61. ## algebra

Militsa has 4 times as many nickels as dimes. Their total value is \$8.10. How many of each coin does she have

62. ## Music

What is the Mongolian equivalent to the guitar called? I've searched under Mongolian instrument lists, but I couldn't find it. Thanks!

63. ## Misc./Project/Art

Hello, I need to come up with a very creative way to express who I am to a certain group of people. Unfortunately, I'm not very good at art, so I would have to come up with a new way. Are there any ideas you might have? Thank you very much for your help.

1. ## physics

correction: 7.34x10^22 kg

posted on May 5, 2020
2. ## math

Why don't you guys actually put the answer with the question that's more better. I like your web but you can make it more better and I will tell lots of people about this not trying to cause trouble. But please put the answer with the question it will help

posted on March 17, 2020
3. ## French

Evans

posted on December 2, 2019
4. ## French

Juvila

posted on December 2, 2019
5. ## algebra

I would be scared tbh...

posted on September 25, 2019
6. ## Science

I'm sorry if im too late for this question but the correct answer i think is A) The couch will move to the left with a force of 1 N

posted on March 4, 2019
7. ## math

PLZ HELP I NEED IT

posted on January 8, 2019
8. ## Chemistry

Thanks so much fam... youre a life saver

posted on October 15, 2018
9. ## Stem

1.70

posted on November 28, 2017
10. ## english

hosted scolded called punted pressed landed stamped bumped honked dented crunched winked spelled thrilled mended trashed twisted banged

posted on October 17, 2017
11. ## math

posted on August 2, 2017
12. ## math

posted on June 8, 2017
13. ## social studies

THANK YOU GUYS SO MUCH. YEE. YOU ARE THE BEST

posted on May 25, 2017
14. ## Math

Thank you Ms. Sue! :)

posted on April 11, 2017
15. ## Math

So what I'm getting is: 22 + 13 = 35 35 ÷ 7 = 5 degrees per hour Is this correct?

posted on April 11, 2017
16. ## math

A tomato plant has grown 5 inches over the last 9 days at this rate how many inches will it grow over the next 15 days

posted on January 18, 2017
17. ## Math, Geometry and Physics

less than 270m or more than 3480m.

posted on October 18, 2016
18. ## Chemistry

I don't knw it. Buh pls m interested In d solution

posted on October 15, 2016
19. ## biology

assignment

posted on August 10, 2016
20. ## maths

15

posted on May 27, 2016
21. ## English

As a young girl growing up in Africa, the narrator came into contact with many native Africans. Those who found themselves in the employ of her family were the fortunate ones, she believed. While she acknowledged that they exist, the narrator took for

posted on May 19, 2016
22. ## physics

Coefficient of friction=F/R=ma/mg=a/g Coefficient of friction of rubber on dry concrete=0.6>>0.85 So to make it accurate coefficient=0.75 0.75=a/10 a=7.5m/s^2 Recall that.. v^2=u^2+2as v^2=0^2+2×7.5×30 v^2=450 v=√450 v=21.2m/s (b)coefficient of

posted on April 20, 2016
23. ## Physics

Coefficient of kinetic friction =F/R=ma/mg Which is a/g since the mass is equal 0.64=a/10 a=6.4m/s NB. g=10m/s Recall v=u+at V=15+6.4×2 V-15=12.8 V=12.8+15 V=27.8m/s

posted on April 20, 2016
24. ## Calculus

t is greater than 0.5, not 2

posted on February 19, 2016
25. ## physics

For the velocity remember that the work done on the ice by the spring is calculated as the change in Kinetic Energy of the block or: Work = (1/2)mass*velocity(final)^2 - (1/2)mass*velocity(initial)^2 Plug in your Work answer from part a and substitute into

posted on October 12, 2015
26. ## physics(measurement)

Thank you.

posted on August 26, 2015
27. ## Medical Coding 2

Answer I came up for Ilsa and Anonymous is 943.29 (multiple, because it's both arms) E924.8 (where: other-burning by: hot object NOS) E849.0 (where) E015.2 (activity) E000.8 (who) 99251 (inpatient - hospital-based clinic) 16030 (large dressing change)

posted on May 6, 2015
28. ## medical Coding

my take on it is: 972.9, E950.4, E000.8, E849.7, 99281, 96365, 96366x2, J1610x20, J7070

posted on May 6, 2015
29. ## physics

hysics - Joy, Friday, June 14, 2013 at 6:14pm 1.a2.b3.c4.a5.c6.c7.c8.a9.a10.c11.c12.d13.b14:a15.d16.c17.b18.c19:d20:b.

posted on March 18, 2015
30. ## physics

3.3m/s

posted on March 18, 2015
31. ## Accounting

12,069

posted on July 26, 2014
32. ## Math

What is the maximum height reached by the ball? If a baseball is projected upward from ground level with an initial velocity of 64 feet per second, then its height is a function of time, given by s= -16t^2 + 64t

posted on April 24, 2013
33. ## algebra with pizazz pg 40 riddle

I need help with problem E: 2v + 18 = 16 - 4(v + 7)

posted on January 24, 2013

Just multiply 8 and 5 you will get 40 when you add two zeros you get 4000.Check your answer on paper, If you wish to

posted on November 30, 2011
35. ## English

Thank you, your responses helped my very much.

posted on November 9, 2011