# Posts by John

Total # Posts: 8,288

**math**

3/8jof the cast in a musical hE TO SING. WHAT FRACTION OF THE CASt DOES not have to sing?

*February 17, 2015*

**maths**

how many terms are there in an arithmetric sequence if it has a common difference of 3 , a last term of 30 and the sum of its terms is 135

*February 17, 2015*

**statistics**

From Lab 3, Problem 2 2. The data set magnet is from an experiment to see the effect of voltage and number of turns on the magnetic force of an electromagnet. The experimenters expected to see a limit to which the number of turns could increase the force. (This is actually a ...

*February 16, 2015*

**Physics**

This is sort of a stupid problem. You don't need the mass of the object to solve the problem. If you look at the figure, the force corresponding to 10 m is 150 N and the one corresponding to 35 m is 250 N. Then the work is: W=(35-10)*(150+250)/2 ( this is the area of the ...

*February 16, 2015*

**physics**

As a protest against the umpire’s calls, a baseball pitcher throws a ball straight up into the air at a speed of 20.4 m/s. In the process, he moves his hand through a distance of 1.57 m. The acceleration of gravity is 9.8 m/s 2 . If the ball has a mass of 0.147 kg, find ...

*February 15, 2015*

**Chemistry**

Calculate the molar extinction coefficients for carotene and chlorophyll using the peaks of highest absorption and Beer’s law.Show your calculations.basically solve for e A = ebc Carotene (Yellow) = Highest peak 450 nm and 0.455 absorption A = ebc 0.455 = e*1cm*c? 0.455...

*February 15, 2015*

**English**

Parenthetical expressions include information that may be helpful but are not essential to the meaning of a sentence. They are de-emphasized by ________. A. dashes B. parentheses C. commas D. brackets I'm not really understanding this question. It has to be either B or D ...

*February 13, 2015*

**English**

Avoid ________ when writing an essay. A. summarizing B. using personal input C. quotations D. sermonizing D?

*February 13, 2015*

**English**

I apologize. I believe it is A

*February 13, 2015*

**English**

1. An example of a prediction conclusion is ________. A .suggesting what the audience might do after they read your paper B. picking up an idea or image suggested in the introduction and echoing it in the conclusion C. a logical extension of the information in the body of ...

*February 13, 2015*

**science**

Ans.: (1000mL/1L)(1.18 g/mL)(0.37)(1mol HCl/36.5 g HCl) = 11.96 M We want to make 100 mL of 6.0 M: 600 mmol HCl required V x M = V x M 100 mL x 6.0 mmol/mL = V x 11.96 M V = 50.17 mL Therefore, take 50 mL of the conc. HCl and dilute to exactly 100.0 mL with water.

*February 12, 2015*

**Microeconomics**

The demand for a good is given by QD = 750 – 0.4P. What is consumer surplus at a price of $80?

*February 11, 2015*

**math**

If a fowl is treated, probability of dying is 1/10 while if not treated the probability is 7/10 calculate the probability that, a fowl picked at random from the 36 fowl is (i) Treated with the drug and will die (ii) Not treated with the drug and will die (iii) Not treated with...

*February 11, 2015*

**Geometry**

given ab is a tangent of point x, ab=70 and xd= 12 what is the measure of db?

*February 11, 2015*

**physics**

If a rubber tire having a weight of 18.0lbs requires a force of 38.0N to keep it in uniform motion on a level highway find the coefficient of kinetic friction.

*February 10, 2015*

**math**

The angle which the tangent to the curve at the point (2, 5) makes with the horizontal

*February 10, 2015*

**math**

Integrated Math 1. The Overland Trail: Traveling at a constant Rate. Who will make it? Need help graphing 3 sets of data on one graph?

*February 9, 2015*

**economic theory**

assume that a business firm produces two commod ities, X and Y, with two different inpu ts, Labour (L) and Capital (K). The total quantities of L and K available per un it of time are specified as L = 1600 labour hours; and K = 20 00 units. In addition, assume that producing 1...

*February 9, 2015*

**math**

The radius of circle is given as 2.8 cm to 2 significant figure (a) If C is the circumference of the circle, determine the limits between which C/π lies. (b) By taking π be 3.14; find to 4 significant figures the line between which the circumference lies

*February 9, 2015*

**math**

trying to help the kid with hw but not smart enough. please help. Thank You! -(5/7) ^ -2/5 can be written as -(a)^b where "a" is a positive rational number that is greater than 1 and "b" is a positive rational number that is less than 1. Find 'a' ...

*February 8, 2015*

**math**

Samuel bought three cups and four spoons for Kshs 324. Daniel bought five cups and Mary bought two sppons of the same type as those bought by Samuel. Daniel paid Kshs 228 more than Mary. Find the price of each cup and spoon.

*February 8, 2015*

**math**

There are two sign posts A and B on the edge of the road. A is 400 m to the west of b. A tree is on a bearing of 60 degree from A and a bearing of 330 degree from B Calculate the shortest distance of the tree from the edge of the road.

*February 7, 2015*

**math**

There are two sign posts A and B on the edge of the road. A is 400 m to the west of b. A tree is on a bearing of 60 degree from A and a bearing of 330 degree from B Calculate the shortest distance of the tree from the edge of the road.

*February 7, 2015*

**Finance**

11.40

*February 6, 2015*

**chemistry**

0.000839

*February 5, 2015*

**math**

Mary bought and beans from a wholesaler. She then mixed the maize and beans ratio 4:3, she bought the maize as $12 per kg and the beans $4 per kg. if she was to make a profit of 30 %. What should be the selling of price 1 kg of the mixture?

*February 5, 2015*

**math**

The cash prize of a television is shillings 25000. A customer paid deposits Shillings 3750. She repaid the amount owing in 24 equal monthly installments. If she was charged simple interest at the rate of 40% p.a, how much was each installment

*February 5, 2015*

**math**

16 2/3% or 16.67%

*February 5, 2015*

**math**

Mary bought and beans from a wholesaler. She then mixed the maize and beans ratio 4:3 she bought the maize as $12 per kg and the beans $4 per kg. if she was to make a profit of 30 %. What should be the selling of price 1 kg of the mixture?

*February 5, 2015*

**math**

Thanks Ms.Sue.. That's what I got when I divided it. So the 50 T-shirts is the better deal.

*February 5, 2015*

**math**

one company makes 50 t-shirts for $295 and another offers 40 t-shirts for $250. which company is the better deal? answer please

*February 5, 2015*

**Finance**

Determine the annual net cost of these checking accounts: a. Monthly fee $4, check-processing fee of 20 cents, average of 23 checks written per month

*February 5, 2015*

**Finance**

Your parents are retired and have expressed concern about the really low interest rates they’re earning on their savings. They’ve been approached by an advisor who says he has a “sure-fire” way to get them higher returns. What would you tell your parents ...

*February 5, 2015*

**physics**

Calculate the total resistance for ten 120 ohm resistors in series

*February 4, 2015*

**math**

Spencer Morris works in the telemarketing division for a company that pays a salary of $735 per month plus a commission of 31 2% of all sales greater than $15,500. If he sold $45,900 last month, what was his total gross pay?

*February 3, 2015*

**AP Chemistry**

Same. I'm still stuck on this question. Did you get the answer?

*January 31, 2015*

**Chemistry**

Are you taking AP Chemistry online? I'm taking it too! Some questions are hard and there are no answers for it on the internet. :( Which unit are you doing right now?

*January 31, 2015*

**Math**

A cubic foot of water weighs 62.4 lb. A basketball has a radius of 0.39 ft. How much would the basketball weigh if it was filled with water I did 4 times pie times 0.39^3 over 3 and get 0.24834888, I just need to know what to do now ^= power symbol

*January 30, 2015*

**calculus**

(cx)={X if 0 is less than or equal x less than or equal 10 and 0.9x if 10<x

*January 29, 2015*

**Phsyics**

A skier is gliding along at 2.5m/s on horizontal, frictionless snow. He suddenly starts down a 10∘ incline. His speed at the bottom is 13m/s . What is the length of the incline? How long does it take him to reach the bottom?

*January 29, 2015*

**Chemistry**

Since chlorine has similar electronegativity as nitrogen, why can't chlorine form hydrogen bonds?

*January 28, 2015*

**math**

27=-2y+15

*January 28, 2015*

**science gases**

fart

*January 27, 2015*

**Physics**

What is the maximum height above ground a projectile of mass 0.67 kg, launched from ground level, can achieve if you are able to give it an initial speed of 78.5 m/s?

*January 27, 2015*

**MATH**

Sabah has $450 to pay for college textbooks. She expects to pay about $75 per book. Her friend told her that 4 of them can be checked out of the library for free.

*January 26, 2015*

**College Physics**

An electron in a television tube travels the 12 cm distance from the grid to the screen at an average speed of 7.00 107m/s. How long does the trip take?

*January 24, 2015*

**Economics**

How can a trade deficit actually increase the productivity of an economy? 1. by causing people to save 2. by building up a large amount owed 3. by importing funds used for capital deepening 4. by importing goods for short–term use I think 1, can anyone verify?

*January 23, 2015*

**algebra**

Let X be a number. Translate the English phrase or sentence into a mathematical expression. Then evaluate the expression for X =8. The expression is ?

*January 22, 2015*

**statistics**

As part of a data base on new births at a hospital some variables recorded are the age of the mother, marital status of the mother (single, married, divorced), weight of the baby, and gender of the baby. Of these variables A. age, marital status, and weight are quantitative ...

*January 21, 2015*

**science**

assess why the earlier expedition may have failed.

*January 21, 2015*

**math**

Solve, using linear combination. 5x + y = 2 4x + y = 4 Write your answer as an ordered pair or write "no solution" or "infinitely many solutions".

*January 21, 2015*

**True or False?**

The phases of the moon depend on how much of the lighted side of the moon can be seen from Earth

*January 19, 2015*

**True or False?**

Tides are caused by the force of gravity from the sun and moon acting on Earth.

*January 19, 2015*

**economics**

1. A sudden escalation in medical costs for treatment of ischemic heart disease would immediately: Answer Benefit providers. Be passed on to consumers. Benefit insurance companies. Decrease insurance company profits in the short term. Decrease tax revenues to the federal ...

*January 17, 2015*

**Physics**

A boy is trapped in a large area of very soft mud. A man rescues the boy by crawling across a long, light board rather than by walking into the mud. What effect, if any does the board have on the force and the pressure on the mud, compared with walking? A. force and pressure ...

*January 15, 2015*

**Physics**

Chisel is a pivot point between the wire and a 2 cm distance between the pins and the hand is 10 cm F 50 Newton force How much is the mechanical advantage? How much is the forces acting on the wire?

*January 15, 2015*

**Chemistry**

A gas occupies 30 0dm3 at stp what volume would it occupy at 91 and 380mm hg?

*January 14, 2015*

**Science**

In the past, what makes someone or a group of people considered to be "unfit" members of society?

*January 13, 2015*

**Math**

Never mind I eventually found out how to solve it myself.

*January 13, 2015*

**Math**

Given f(x)=-2-3x-x^2 , find f(1+k)

*January 13, 2015*

**Science**

What features of Western culture help lead people to believe in their primacy over nature?

*January 11, 2015*

**Algebra 2**

Adults 5.00 Kids 3:50 240 tickets sold for 1140 How many adults? How many kids?

*January 11, 2015*

**PreCalc**

Thank you sooo much! But how can I solve the 5th degree one algebraically?

*January 10, 2015*

**PreCalc**

Can you guys also help me on this one? x^5 + 4x^4 -16x -16 < 0

*January 10, 2015*

**PreCalc**

Solve each inequality: (1/(2b+1)) + (1/(b+1)) > (8/15) (2/(x+1)) < 1 - (1/(x-1)) My teacher told me the answer is in interval notation, and that a number line is used to solve.

*January 10, 2015*

**Math**

(8.86 + 1.0 * 10^-3) / (3.610 * 10^-3) Calculate the above formula, expressing the answer in scientific notation with the correct number of significant figures: 8.86 + 1.0 * 10^-3 = 8.86 + 0.0010 = 8.8610 = 8.86. 8.86/(3.610 * 10^-3) = 2454 2.454 * 10^3 Please confirm if I did...

*January 9, 2015*

**quantitative methods**

a packing device is set to fill detergent powder packet with a mean weight of 5 kg . The standard deviation is known to be 0.01 kg. these are known to drift upwards over a period of time due to machine fault, which is not tolerable. A random sample of 100 packets is taken and ...

*January 9, 2015*

**English**

What belief does Whitman share with Ralph Waldo Emerson and other transcendentalists? A) We should live our lives well to achieve everlasting happiness. B) Man learns his most important lessons and insights in the present, through direct experience. If I recall correctly ...

*January 8, 2015*

**physics**

P.S. I forgot to multiply by the .5 in the second to last step . It should read : d = 696 + .5 * 1140 m d = 1266 m

*January 8, 2015*

**physics**

d = V0 * t + 1/2 a t ** 2 where average acceleration a = (V1 - V0) / dt V0 = 58 m/s V1 = 153 m/s dt = 12 s a = (153-58)/12 m/(s*s) a = 7.9 m/(s*s) d = 58 * 12 m/s *s + .5 * 7.9 * (12 * 12) m/(s*s) * (s*s) d = 696 + 1140 m d = 1836 m

*January 8, 2015*

**Physics and Math**

P.S. forgot to take square root in time calculation. Should be t = .0007s so v = 100 - 40000 * .0007 * .0007 v = 100 - .02 v = 99.98 m /s

*January 8, 2015*

**Physics and Math**

v = V0 + a * t F = m * a s = .5 * a * t^2 where s = 0.01 m V0 = 100 m / s m = 0.5 kg F = 2000 kg m/(s^2) solving f=ma for a : a = f/m = -2000/0.05 m/(s^2) = -40000 m/(s^2) solving s = .5at^2 for t : 2s = at^2 2s/a = t^2 t = square root(2s/a) t=square root (2 * 0.01m) / -40000 ...

*January 8, 2015*

**physics**

v = V0 + a * t V0 = 0 a = 2.75 m/s^2 t = 3.00 s v = 0 + 2.75 * 3.00 m/s v = 8.25 m/s

*January 8, 2015*

**Science/earth**

How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.

*January 6, 2015*

**Pre-Calc**

Yeah sorry, my bad. I must have plugged in the numbers wrong, since I just got 44.5 for my answer. You guys are right, Thanks so much Steve and Reiny for your help!

*January 4, 2015*

**Pre-Calc**

Sorry, I'll be more clear. The question already stated how high the ferris wheel is at t=8 seconds. The highest point the ferris wheel reaches is 63 feet and the time for that is 8 seconds. What I'm trying to find out is how high the ferris wheel is when t=5 seconds ...

*January 4, 2015*

**Pre-Calc**

when i plug in t=5, I get 62.99 feet, but isn't that the height when t=8 seconds?

*January 4, 2015*

**Pre-Calc**

A ferris wheel is 63 feet tall when it reaches its highest point at 8 seconds. At the bottom of the ride, you are 3 feet off the ground. So how high off the ground will you be 5 seconds after the ride starts? Write a function f so that f(t) will equal how high in feet you will...

*January 4, 2015*

**Algebra 1**

x^4-9x^3-7x^2-8x+2 Divide by x^2+x+1 Thanks

*January 4, 2015*

**Algebra 1**

6x^3-3x^2+x-40 Divided by x-2

*January 4, 2015*

**Algebra**

The length of a rectangle is 8 ft less than three times the width, and the area of the rectangle is 35 ft2 . Find the dimensions of the rectangle.

*January 2, 2015*

**science**

How does money and politics affect the public claims about global warming? Pick on news source (news company, think tank, or university) and investigate its credibility.

*December 29, 2014*

**Algebra**

An acre of land is chosen at random from each of the three states listed in the table at the right. What is the probability that all three acres will be farmland? 1. Does the choice of an acre from one state affect the choice from the other states? 2. How must you rewrite the ...

*December 28, 2014*

**Algebra**

An acre of land is chosen at random from each of the three states listed in the table at the right. What is the probability that all three acres will be farmland? 1. Does the choice of an acre from one state affect the choice from the other states? 2. How must you rewrite the ...

*December 28, 2014*

**math**

a boy has 380 prize tickets he wants to exchange for action figures at a prize booth,the prize both tickets 5 tickets can be exchanged for a large figure and 7 tickets for 2 small figures the boy wants 4 times as many small action figures as large can the boy get 80 small ...

*December 28, 2014*

**Algebra**

Thank you.

*December 23, 2014*

**Algebra**

Thank you for your quick reply. Can you please share the work ? Guess work in math could land up in wrong spot.

*December 23, 2014*

**Algebra**

r^3-24r-5 / r-5 How to divide r^3-24r-5 / r-5 quickly with less steps ? Thanks

*December 23, 2014*

**Physics**

-10.8 is the impulse

*December 21, 2014*

**Calculus**

If 3x^2+y^2=7 evaluate ((d^2)y)/(dx^2) when x=1 and y=2

*December 21, 2014*

**calculus**

use implicit differentiation to find y=(x+8)^(3x)

*December 21, 2014*

**Chem**

Sorry I wasn't clear. That was the answer I got. I think my sig figs wrong cause I don't see any with three.

*December 17, 2014*

**Chem**

I set it up just like that and got kelvins right but still got it wrong 301.15k for T1 258.15k for T2 Answer was 0.887

*December 17, 2014*

**Chem**

A pressurized can of whipping cream has an internal pressure of 1.035 atm at 28°C. If it is placed in a freezer at -15°C, what is the new value for its internal pressure?in atm

*December 17, 2014*

**calculus**

No idea where to start The cost in dollars of producing x units of a particular camera is C(x) = x2 - 10000. (10 points) Find the average rate of change of C with respect to x when the production level is changed from x = 100 to x = 101. Include units in your answer. Find the ...

*December 16, 2014*

**calculus**

so would the velocity be -29.4?

*December 16, 2014*

**calculus**

supposed to be a 4.9t^2+550

*December 16, 2014*

**calculus**

Do I just put in 3 for t? A ball is dropped from a tower 550 meters above the ground with position function s(t) = 4.9t2 + 550. What is the velocity of the ball after 3 seconds?

*December 16, 2014*

**Calculas**

Do I just put in 3 for t? A ball is dropped from a tower 550 meters above the ground with position function s(t) = 4.9t^2 + 550. What is the velocity of the ball after 3 seconds?

*December 16, 2014*