Thursday

October 27, 2016
Total # Posts: 189

**math**

the sum of the ages of three redwood trees is exactly one thousand years. when the youngest tree reaches the age of the middle tree, the middle tree will have reached the age of the oldest tree. at that time the middle tree will be four times the current age of the youngest ...

*September 12, 2016*

**Math**

If a storage tank is holding 450 litres when it is three-quarters full, how much will it contain when it is two-thirds full?

*September 3, 2016*

**Math**

.............A ____________B .............../..................\ ............../....................\ ............./......................\ ...........F\....................../C ..............\.................../ .............E\___________/D Here's the figure again.

*August 26, 2016*

**Math**

The following regular hexagon A ____________B / \ / \ / \ F\ /C \ / E\____________/D has two diagonals going through it, FD and CE. These two lines form 3 triangles. We know that the area of the hexagon is 1. What is the area of those 3 triangles?

*August 26, 2016*

**calculus**

Find all first and second partial derivatives of z with respect to x and y if x^2+4y^2+16z^2−64=0.

*August 24, 2016*

**calculus**

Find lim as (x,y) goes to (0,0) of (e^(-x^2-y^2)-1)/(x^2+y^2).

*August 20, 2016*

**calculus**

A particle moves so that its position is given by ⟨cos(t),sin(t),cos(6t)⟩. Find the maximum and minimum speeds of the particle.

*August 19, 2016*

**calculus**

Find an equation of the plane containing the line of intersection of x+y+z=1 and x−y+2z=2, and perpendicular to the x-y plane.

*August 16, 2016*

**calculus**

Do the three points (1,2,0), (−2,1,1), and (0,3,−1) form a right triangle? I think they do by using dot product. Do the three points (1,1,1)(1,1,1), (2,3,2)(2,3,2), and (5,0,−1)(5,0,−1) form a right triangle? I think they don't.

*August 14, 2016*

**calculus**

I'm actually trying to find a vector.

*August 14, 2016*

**calculus**

A force of 10 pounds is applied to a wagon, directed at an angle of 30∘30∘. Find the component of this force pulling the wagon straight up, and the component pulling it horizontally along the ground.

*August 14, 2016*

**calculus**

Find the Maclaurin series of xcos(x^2).

*August 7, 2016*

**Calculus**

Calculate the interval of convergence. Sigma from n=1 to infinity of (n!*x^n)/n^n. Calculus - Steve, Friday, July 29, 2016 at 11:52pm try using the ratio test. You should be able to show that the series converges for |x| < e I tried and I got |x|lim n-infinity of |(n/n+1)^n...

*July 30, 2016*

**Calculus**

I tried and I got |x|lim n-infinity of |(n/n+1)^n| which I get |x|<1

*July 29, 2016*

**Calculus**

Calculate the interval of convergence. Sigma from n=1 to infinity of (n!*x^n)/n^n.

*July 29, 2016*

**Math**

Solve the equation using exact values. Check for any extraneous roots. 9^2x+4(9^x)=21.

*July 23, 2016*

**math-steve**

When Mr. Lucky starts betting, he has 3 dollars. On any bet, he wins with probability 1/3 and loses with probability 2/3. If he wins a bet, the total amount of money he has triples. If he loses a bet, he loses 2/3 of the total amount of money he has. Mr. Lucky’s objective...

*July 8, 2016*

**math-steve**

When Mr. Lucky starts betting, he has 3 dollars. On any bet, he wins with probability 1/3 and loses with probability 2/3. If he wins a bet, the total amount of money he has triples. If he loses a bet, he loses 2/3 of the total amount of money he has. Mr. Lucky’s objective...

*July 5, 2016*

**math**

When Mr. Lucky starts betting, he has 3 dollars. On any bet, he 7. wins with probability 1/3 and loses with probability 2/3. If he wins a bet, the total amount of money he has triples. If he loses a bet, he loses 2/3 of the total amount of money he has. Mr. Lucky’s ...

*July 5, 2016*

**Math**

sorry the square got messed up

*July 4, 2016*

**Math**

A circle of radius greater than 9 cm is inscribed in the square ABCD. A point P on the circle is 8 cm from side AB of the square, and 9 cm from side AD. What is the radius of the circle? D-----------C | | | | <---circle inscribed in it | | | | A-----------B

*July 4, 2016*

**Calculus**

How do you find the derivative of sqrt(x+sqrt(x+sqrt(x+.......)))?

*March 29, 2016*

**Calculus**

Use the integral identity: ∫(a-1) (1/(1+x^2))dx=∫(1-1/a) (1/(1+u^2))du for a>1 to show that: arctan(a)+arctan(1/a)=π/2

*March 14, 2016*

**math**

What is the largest integer n such that 1440/(n^2-1) is an integer?

*March 5, 2016*

**math**

What is the largest integer n that 4n+1 is a multiple of n+1?

*March 5, 2016*

**Math**

How many digits are in the decimal representation of 5^40? No calculator allowed.

*March 2, 2016*

**calculus**

There is a shape first a regular triangle inscribed in a circle, and inscribed in a square, inscribed in a circle, inscribed in a pentagon, etc. so polygon circle polygon circle, etc. the radius of the first circle is 1, find an equation for radius n. number 2:give an argument...

*February 22, 2016*

**math**

Prove that sinx=x for x is a real number has only one solution at x=0

*February 15, 2016*

**Math**

physical hands they can't point to any place on the dial, because it won't be a correct time

*February 6, 2016*

**Math**

If a valid time on a 12 hour time period has the hour hand and minute hand switched, how many times will that result in another valid time? I have found 11, which is when the hour hand points at the same place as the minute hand. I know there is much more, but I can't ...

*February 6, 2016*

**Calculus**

What is the derivative of f^3(g(x)) where both are continuous functions? I used chain rule and got 3f^2(g(x))f'(g(x))g'(x) but it is not right.

*February 5, 2016*

**Calculus**

1. Prove that (f(x+h)-f(x-h))/2=f'(x) 2. Prove that any parabola sastifies the equation (f(x+h)-f(x-h))/2=f'(x) For the first question, I tried to solve it but there is an extra h tacked on to one side. I have no clue what to do for the second question.

*February 1, 2016*

**Calculus**

Use the identity sin^2x+cos^2x=1 and the fact that sin^2x and cos^2x are mirror images in [0,pi/2], evaluate the integral from (0-pi/2) of sin^2xdx. I know how to calculate the integral using another trig identity, but I'm confused about how to solve this one.

*January 18, 2016*

**Calculus**

Integrate 1/sinx dx using the identity sinx=2(sin(x/2)cos(x/2)). I rewrote the integral to 1/2 ∫ 1/(sin(x/2)cos(x/2))dx, but I don't know how to continue. Thanks for the help.

*January 11, 2016*

**Calculus**

Find the volume generated by rotating about the x axis the area bounded by x=0, y=2sinxcosx,, y=2cosx, and x=4, if 0≤x≤pi/2. I don't get the graph.

*January 4, 2016*

**Calculus**

A thin plate lies in the region between the circle x^2+y^2=4 and the circle x^2+y^2=1 above the x axis. Find the centroid. For the second part, same question except the region in the first quadrant instead of above x axis. For part a, I figured out bar x is 0, and I tried to ...

*January 3, 2016*

**Calculus**

Why do you subtract the 2 integrals?

*December 31, 2015*

**Calculus**

A 20 meter long steel cable has density 2 kg per meter. It is hanging straight down. There is a 100 kg bucket of concrete attached to the bottom. How much work is required to lift the bucket 10 meters by lifting the cable ten meters? Gravitational force equals 9.8 in this ...

*December 31, 2015*

**Science - Chemistry**

I am not sure. Can somebody please confirm mol fraction of water : 27.75mol/36.3395mol = 0.76 mol fraction of ethanol : 8.5849 mol/36.3395 = 0.24 Vapour pressure of water inside a bottle of 100 proof : 13.3mmHg (0.76)(17.5mmHg) = 13.3mmHg Ptot = (0.76)(17.5mmHg) + (0.24)(...

*December 30, 2015*

**Salk**

What is 58,420 in simplest form (math question 6grade)

*December 14, 2015*

**trigonometry**

from a point A on the side of straight road, the angle of elevation of the top of the electric pole is 15°20'. from a point B on the same side of the road, the angle of elevation of the top of the pole is 10°52'. If the distance of A and B is 50 meters, what is...

*December 7, 2015*

**wcccd**

A car dealership offers a $1400 rebate and a 5% discount off the price of a new car. Let p be the sticker price of a new car on the dealer's lot, r the price after the rebate, and d the discounted price. Then r(p) = p − 1400 and d(p) = 0.95p

*November 21, 2015*

**wcccd**

The period p of a pendulum, or the time it takes for the pendulum to make one complete swing, varies directly as the square root of the length L of the pendulum. If the period of a pendulum is 1.3 s when the length is 2 ft, find the period when the length is 7 ft. Round to the...

*October 18, 2015*

**history**

1c 2d 3a 4c

*September 21, 2015*

**DC-AC Electronics**

What is a Series Capacitor

*August 4, 2015*

**Maths**

A cylindrical tank has the dimensions a 100cm and 140cm ,if the tank is filled with 275 liters of water what is the depth of water in the tank

*June 16, 2015*

**Science**

what is the combination of waves?

*May 24, 2015*

**Languages Arts**

If im right can you please explain it please

*February 6, 2015*

**Languages Arts**

Which of the following describes the word dew? A. What happens when you don't get enough sleep for a few days. B. What happens to your teeth when you eat too much candy. C. What happens to plants in a garden overnight. D. What happens when you leave a crayon in the sun. Is...

*February 6, 2015*

**Computers**

1. What does the term "fair-use exception" mean? (1 point) to use only material that has never been published the ability to use material made by others for educational purposes an exception to copyright restrictions for images only Educational material is no longer ...

*February 3, 2015*

**Science**

No it's C

*January 21, 2015*

**Science**

Thank you!! so much

*January 9, 2015*

**Science**

3.What are the advantages of your design over using fossil fuels (I JUST WANNA KNOW WHAT DOES THE QUESTION MEAN LIKE BREAK IT DOWN FOR ME YOU DON'T HAVE TO DO IT THANK YOU)

*January 9, 2015*

**English **

1) In the story "A Meeting in the Dark," John's character advances the plot and communicates the theme through each of the following conflicts except. A)man vs. man B)man vs. nature C)man vs. society D)man vs. himself 2) Read the following sentences that reflects...

*December 11, 2014*

**English**

Basically Telephone Conversation

*December 9, 2014*

**English**

Three pieces:Senghor,Soyinka,Achebe

*December 9, 2014*

**English **

Which of the following lines from the poem best shows the speaker's distaste for the situation? A)Silence. Silence transmission of Pressurized good breeding? B)OR VERY DARK?" Button B. Button A. Stench. C)Pushed dumbfounded to beg simplification. D)Her assent was very...

*December 9, 2014*

**English **

In "Telephone Conversation," which of the following best describes the shift in the speaker's attitude towards the landlady? A)from fuming to mischievous B)from angered to conciliatory C)from embarrassed to arrogant D)from cooperative to ninchalant

*December 9, 2014*

**Maths**

The first term of an AP is 12 and that of a GP is 6. The common difference and the common ratio are equal, so as are the sum of the fist 3 terms. Find the possible values of the common difference?

*December 1, 2014*

**math**

Cut the cake in half. Cut the two half into 4th. Then cut each of the two halves into 2. You then get 16 pieces Fraction for the whole cake: 16/16 for half of cake ts 8/16 for the piece she ate 8/16 x 1/4 =2/16 she ate 2/16 of the whole cake the remaining piece 8/16 x 3/4 = 6/...

*December 1, 2014*

**physics**

A constriction in a pipe reduces its diameter from 7.9 cm to 1.8 cm . Where the pipe is wider, the fluid velocity is 8 m/s. Find the fluid velocity where the pipe is narrow. Answer in units of m/s

*November 6, 2014*

**physics**

A circular swimming pool has a flat bottom and a 4.39 m diameter. It is filled with water to a depth of 1.51 m. There is 1.36 atm of pressure on the top surface.

*November 6, 2014*

**physics**

What force F must be applied to the small piston to maintain the load of 49 kN at a constant elevation?

*November 6, 2014*

**physics**

If the average gauge pressure in the vein is 14400 Pa, what must be the minimum height of the bag in order to infuse glucose into the vein? Assume that the specific gravity of the solution is 1.05. The acceleration of gravity is 9.8 m/s

*November 6, 2014*

**physics**

A 73 kg man in a 4.3 kg chair tilts back so that all his weight is balanced on two legs of the chair. Assume that each leg makes contact with the floor over a circular area of radius 1.5 cm. Find the pressure exerted on the floor by each leg. The acceleration of gravity is 9.8...

*November 6, 2014*

**Calculus**

It is known that the quantity demanded of a certain make of portable hair dryer is x hundred units/week and the corresponding wholesale price is shown below where p is in dollars. p = sqrt(225 - 5x) The supplier will make x hundred units of hair dryers available in the market ...

*September 25, 2014*

**Reading**

ohh okay so it must be A? my second choice is A

*September 17, 2014*

**Reading**

8. in which sentence is the word gesture used correctly ( 1 point) A.Smiling, she extended her hand in a gesture of friendship. B.Tired from a long day of work, I put my gesture down on the table wearily.**** C.He called for a gesture next Tuesday, and all employees are to ...

*September 17, 2014*

**Social Studies**

B

*September 15, 2014*

**social studies check**

Thank you

*September 12, 2014*

**science**

i say yes is that right?

*May 6, 2014*

**science**

Is it ture that air molecules have weaker attractions then water molecules? A.Yes B.No

*May 6, 2014*

**3 questions~~~**

1.B 2.C 3.C Ms.Sue is my answers right for these questions??

*April 12, 2014*

** Math**

If a boat rental company charges 100.00 a day plus .50 per kilometer and another company charges 90.00 a day plus .60 per kilometer, at how many miles would the bill at both companies be the same?

*January 30, 2014*

**science**

Earth is a satellite because it moves around the sun.

*January 30, 2014*

**Science**

100% Shayla

*December 13, 2013*

**SS**

Thank you so much

*September 29, 2013*

**Math**

A candle has length 25 cm. Once lit, the candle burns away at a constant rate of 0.6 cm per minute. What is the length of the candle (in cm) 20 minutes after it is lit?

*September 22, 2013*

**programming**

where are the errors the pseudocode debugging exercise // This application reads student typing test data // including number of errors on the test, and the number // of words typed per minute. Grades are assigned based // on the following table: // Errors // Speed 0 1 2 or ...

*September 15, 2013*

**programming**

trying to debug pseudocode 2. Th e Springwater Township School District has two high schools—Jeff erson and Audubon. Each school maintains a student fi le with fi elds containing student ID, last name, fi rst name, and address. Each fi le is in student ID number order. ...

*September 4, 2013*

**programming**

DEBUGGING // The two senior class homerooms at Littleville High School // are having a fundraising drive for the prom. Each time a student // solicits a contribution, a record is created with the // student's name and the value. Two files have been created for Homeroom A ...

*September 1, 2013*

**programming**

Find Bugs in the pseudocode start Declarations num category num SIZE = 5 num QUIT = 9 num sales[SIZE] = 0, 0, 0, 0, 0 string HEAD1 = "Sales" string HEAD2 = "Category Number of Sales" output "Enter category ", QUIT, " to quit " input ...

*August 30, 2013*

**LBCC**

78125

*April 7, 2013*

**Math**

Kathy drove from Dry Creek to Cactus, a distance of 250km. She increased her speed by 10km/h for the 360km trip from Cactus to spur. If the total trip took 1 hours, what was her speed from Dry creek to Cactus.

*April 7, 2013*

**Just some LA q's, Ms.Sue please**

so what was the answer

*February 7, 2013*

**math**

A runner starts a race at the starting line. A second runner starts at 44 yards. If the first runner moves 7 yards each second and the second runner moves 3 yards each second, at what distance will the first runner catch the second runner?

*January 14, 2013*

**language**

introduction for an essay . show me please

*October 2, 2012*

**english **

what is a simple predicate in a well-fed lion will be peaceful thank you

*August 31, 2012*

**calculus**

a graph shows the divends declared per share of stock for the colgate-palmolive company for the years 1988 through 1998. Find the slope of the line segment connecting the years 1988 and 1998

*August 22, 2012*

**statistics**

Considering that a researcher can test at the <p = .05 (95%), p = .01 (99%), or p = .001 (99.9%) level for statistical significance, how would you use these three levels in relationship to risk to patients in implementing the decisions of your research?

*June 16, 2012*

**Math Models**

The distance needed to stop a car (d) varies directly with the aquare of the speed of the car (s). If a car traveling 25 mph requires 0 feet to stop, how many feet will be required to stop a car that is traveling at 60 mph?

*June 13, 2012*

**Chemistry**

What massof iron is contained in 86.6 grams if FeSO4?

*June 12, 2012*

**Statistics**

The Arcade shack is a manufacturing plant located in San Diego where 800 factory workers are employed. The personnel department selected 36 factory employees at random for the statistical study. construct a 95% interval for the percentage of males in the 800.

*May 23, 2012*

**math**

Look at the list. 7 is in all of the lists, so 7 is the answer. 1,1=2 1,2=3 1,3=4 1,4=5 1,5=6 1,6=7 ---------------------------------- 2,1=3 2,2=4 2,3=5 2,4=6 2,5=7 2,6=8 ---------------------------------- 3,1=4 3,2=5 3,3=6 3,4=7 3,5=8 3,6=9...

*April 11, 2012*

**business**

Lansing Auto Pats, Inc., has projected sales of $25,000 in October , $35,000 in November, and $30,000 in December of the company’s sales 20 percent are paid for by cash and 80 percent are sold on credit. The credit sales are collected one month after the sale. Determine ...

*March 20, 2012*

**Science**

im not sure

*March 1, 2012*

**Chemistry**

A solution is prepared by adding 50.3 mL of concentrated hydrochloric acid and 16.6 mL of concentrated nitric acid to 300 mL of water. More water is added until the final volume is 1.00 L. Calculate [H+], [OH -], and the pH for this solution. [Hint: Concentrated HCl is 38% HCl...

*February 28, 2012*

**Finite with Calculus Applications**

The Ball Company manufactures three types of lamps, labeled A,B,and C. Each lamp is processed in two departments, I and II. Total available work-hours per day for departments I and II are 400 and 600, respectively. No additional labor is available. Time requirements and profit...

*February 27, 2012*