Friday

February 24, 2017
Total # Posts: 61

**cal**

Consider the following. (a) Set up an integral for the volume a solid torus (the donut-shaped solid shown in the figure) with radii br and aR. (Let a = 8 and b = 2.) dy (b) By interpreting the integral as an area, find the volume V of the torus. V =

*February 24, 2017*

**K**

Find the volume V of the solid obtained by rotating the region bounded by the given curves about the specified line. y = 3e^(-x), y = 3, x = 2; about y = 6

*February 24, 2017*

**CALCULUS**

At noon, ship A is 130 km west of ship B. Ship A is sailing east at 30 km/h and ship B is sailing north at 20 km/h. How fast is the distance between the ships changing at 4:00 PM?

*November 9, 2016*

**CALCULUS**

F(x) = f(xf(xf(x))) ⇒ F ′ (x) = f ′ (xf(xf(x))) · d dx (xf(xf(x))) = f ′ (xf(xf(x))) · x · f ′ (xf(x)) · d dx(xf(x)) + f(xf(x)) · 1 = f ′ (xf(xf(x))) · [xf′ (xf(x)) · (xf&#...

*October 22, 2016*

**CALCULUS**

if F(x) = f(xf(xf(x))),where f(1) = 4, f(4) = 6, f '(1) = 4, f '(4) = 5,and f '(6) = 6,find F '(1).

*October 22, 2016*

**cal**

9/8

*October 22, 2016*

**cal**

If h(x) = (4 + 3f(x))^(1/2) ,where f(3) = 4 and f '(3) = 3,find h'(3).

*October 22, 2016*

**Physics**

A particle undergoes two displacements, measured from the positive x-axis, with counterclockwise positive. The first has a magnitude of 11 m and makes an angle of 67 ◦ with the positive x axis. The resultant displacement has a magnitude of 7.7 m directed at an angle of ...

*September 14, 2016*

**math**

Product A This product will take 2 years to develop, at a cost of $100,000 in the first year (Yr 0) and $50,000 in the second. Revenue (benefits) in subsequent years is expected to be $100,000 per year. Product B This product will only take a year (Yr 0) to develop, at a cost ...

*May 27, 2015*

**math**

find the dividing polynomials

*October 6, 2014*

**chemistry**

convert the value of the vapour pressure (149.4 torr) at 60 degree celsius to atm

*February 5, 2014*

**precalculus II**

Solve: (x-2)5^x = 5^(x+2)

*February 4, 2014*

**precalculus II**

Solve: (x-2)5^x = 5^(x+2)

*February 4, 2014*

**Precalculus II**

Thank you so much Demon sir

*February 4, 2014*

**Precalculus II**

1. The number of hours of daylight D(t) in Halifax at day t can be approximated by the function D(t) = a sin(bt + c) + d, where t = 1 on January 1, and t = 365 on December 31. The period is one year, and the cycle starts on the vernal equinox, March 21, which has 12 hours of ...

*February 4, 2014*

**math**

Show that the minute hand of a watch gains 5 degree and 30' on the hour hand in a minute

*July 6, 2013*

**Math**

a trapiziod has vertices A(-2,3) B(4,1) C(-1,-1) and D(2,-2). prove that the line joining the midpoints of the non-parallel sides is the average length of the two parallel sides of the trapaziod.

*October 12, 2011*

**need help asap, plz help! math10**

a trapiziod has vertices A(-2,3) B(4,1) C(-1,-1) and D(2,-2). prove that the line joining the midpoints of the non-parallel sides is the average length of the two parallel sides of the trapaziod.

*October 12, 2011*

**math grd 10**

a trapiziod has vertices A(-2,3) B(4,1) C(-1,-1) and D(2,-2). prove that the line joining the midpoints of the non-parallel sides is the average length of the two parallel sides of the trapaziod.

*October 12, 2011*

**Math**

-log[7.1x10^-3]

*June 29, 2011*

**Chemistry**

Calculate ph value of soft drink having hydrogen ion concentration equal to 3x10^-5.

*June 29, 2011*

**Chemistry**

Calculate ph value of soft drink having hydrogen ion concentration equal to 3x10^-5.

*June 29, 2011*

**Chemistry**

Calculate the ph of 10^-8 M (HCL).

*June 29, 2011*

**Chemistry**

Will ph value of water be same at temp 25°C & 4°C? Justify it.

*June 29, 2011*

**Chemistry**

Will ph value of water be same at temp 25°C & 4°C? Justify it.

*June 29, 2011*

**Chemistry**

Will ph value of water be same at temp 25°C & 4°C? Justify it.

*June 29, 2011*

**math**

the value of a rare dime is expected to increase according to the equation, y=25x+10, wherer y is the value of the coin (in cents) after x years a)state the slope of the line and interperate its meaning b) state the y-intercept of the line and interperate its meaning

*June 16, 2011*

**Physiology**

As you turn your body and head while doing an activity like a somersault, different hair cells in the vestibule and semicircular canals change direction. When this happens, electrical signals are sent through the nerve fibers which connect to your eye muscles, which causes ...

*June 2, 2011*

**Science grd 9**

Determine which appliance uses the most electrical energy: a clothes dryer that operates for 30 min/day or a freezer that operates for 24h/day. Please show work

*December 2, 2010*

**Science grd 9**

Calculate the cost of watching TV for 5 h at night at a rate of 8.8 cents/kW•h. The TV has a power rating of 180W. Please show work

*December 2, 2010*

**Science grd 9**

The estimated average energy that I used to operate a cloths dryer for a year is is kW•h. If the average rate to operate the dryer is 7.15 cents/kW•h, what is the average cost per year.

*December 2, 2010*

**English**

What is the meaning of the following lines said in the book or play Macbeth? As whence the sun 'gins his reflection Shipwracking storms and direful thunders break,So from that spring whence comfort seemed to come Discomfort swells. It was said by sergant in Act 1, scene 2 ...

*June 18, 2010*

**Math**

Evaluate 12 hours 35 minutes - 4 hours 40 minutes

*September 9, 2009*

**math**

thank you, I really appreciate all you're help and I was thinking the same but the book was confusing me, guess the book is wrong as usuall thanks a lot....

*July 6, 2009*

**math**

how to find the LCD for 11x/yz^2, 8x/y^2z? I know the answer is yz^2 but how do you get that. can you plzz plzz explain..... this it is really important..... thnx ...... a lot..

*July 6, 2009*

**math**

Determine the exact solution algebraically. a) 2^x= 2^7. can someone plz answer this for me, thanks a lot

*July 2, 2009*

**math**

If cotalpha = root 3, calculate (sin alpha)*(cot alpha) - cos^2alpha exactly. can you plzzz help urgent because I have a major test tommorow thnx for all your help

*April 29, 2009*

**math (grade 11 operations with radicals)**

thnx but how to simplyfy more, i also got till here.

*March 27, 2009*

**math (grade 11 operations with radicals)**

Simplify sqrt12 + sqrt18 - sqrt27 + sqrt 50 thnx a lot any help is greatly appriceted.... these are grade 11 radical expressions and the answer for this is : - -sqrt3 + 8sqrt2

*March 27, 2009*

**this is wrong**

this is grade 11 operations with radicals and the answer for this is -sqrt3 + 8sqrt2

*March 27, 2009*

**math**

that is sqrt12 + sqrt18 - sqrt27 + sqrt 50

*March 27, 2009*

**math**

Simplify ã12+ã18-ã27+ã50 thnx a lot any help is greatly appriceted....

*March 27, 2009*

**math**

how to complete the square for -2x^2+3x-1? can you plz help me, and any help is greatly appricieted. thnx a lot for your effort.

*March 26, 2009*

**math**

A highschool is planning to build a new playing field surrounded by a running track. The track coach wants two laps around the track to be 1000m. The football coach wants the rectangular infield area to be as large as possible. Can both coaches be satisfied? can somebody plz ...

*March 24, 2009*

**Chemistry**

calculate the pH at 0ml at the quivalence point and at 40ml in a titration of 25 ml of .120M formic acid with .105M NaOH (kA of formic acid= 1.8x10^-4)

*March 1, 2009*

**math**

thnx a lot now i fully understand

*January 23, 2009*

**math**

A water balloon is shot into the air so that its height h, in metres, after t seconds is h = —4.9t^2 + 27t + 2.4 a)How high is the balloon after 1 s? b)For how long is the balloon more than 30 m high? c)What is the maximum height reached by the balloon? d)When will the ...

*January 23, 2009*

**Math**

A truck driver estimates that a country road rises 40 cm for every 6 m along the road. What is the angle of inclination of the road? Express your answer to the nearest tenth of a degree. Can you please help sir Thnks

*January 22, 2009*

**Math**

A small plane flying into the wind takes 3h 20 min to complete a flight of 960 km.Flying with the wind, the same plane takes 2h 30 min to make the trip. What is the speed of the plane? What is the speed of the wind? can you plz help thx I really am thankful to have found a ...

*January 22, 2009*

**Math**

is the answer 727.5 thnx

*January 22, 2009*

**Math**

Flying into the wind, a plane takes 8 h to travel 5432 km from Paris to Montreal. The same plane flying with the wind from Montreal to Paris takes only 7 h. Find the speed of the plane and the speed of the wind. Can you plz answer this sir I really would appriciete it. Plz can...

*January 22, 2009*

**Math**

A farmer has $2400 to spend to fence two rectangular pastures.The local contractor will build the fence at a cost of $6.25/m. What is the largest area that the farmer can have fenced for that price?

*January 22, 2009*

**Math**

FeatureShop sells 80 stereos per month at a cost of $600 each. The manager knows that for every $10 price increase there will be one less stereo sold per month. What price will produce the greatest revenue?

*January 22, 2009*

**Math**

Rita kicks a football. Its height h, in metres, after t seconds is given by h = —4.9t^2 + 22.54t + 1.1. To one decimal place, find the maximum height of the football and the time when it reached this height.

*January 22, 2009*

**Math**

A framer at a photo gallery wants to frame a print with a matte of uniform width all around the print. To make it pleasing to the eye, the area of the matte should equal the area of the print. If the print measures 40 cm by 60 cm, how wide should the matte be?

*January 22, 2009*

**Math**

A small plane flying into the wind takes 3h 20 min to complete a flight of 960 km.Flying with the wind, the same plane takes 2h 30 min to make the trip. What is the speed of the plane? What is the speed of the wind?

*January 22, 2009*

**Math**

A truck driver estimates that a country road rises 40 cm for every 6 m along the road.What is the angle of inclination of the road? Express your answer to the nearest tenth of a degree.

*January 22, 2009*

**Math**

Flying into the wind, a plane takes 8h to travel 5432 km from Paris to Montreal.The same plane flying with the wind from Montreal to Paris takes only 7 h. Find the speed of the plane and the speed of the wind.

*January 22, 2009*

**Math**

sorry i would not do that again but can you please answer these questions because i really need them because i have a exam tommorow at 1 pm. i posted them in a series because i have so less time to study, that i was not even thinking write and i just posted them all but can ...

*January 22, 2009*

**Math**

A water balloon is shot into the air so that its height h, in metres, after t seconds is h = —4.9t^2 + 27t + 2.4 a)How high is the balloon after 1 s? b)For how long is the balloon more than 30 m high? c)What is the maximum height reached by the balloon? d)When will the ...

*January 22, 2009*

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