Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 49

**chemistry **

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

**precalculus II**

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

**precalculus II**

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

**Precalculus II**

Thank you so much Demon sir

**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 d...

**math**

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

**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.

**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.

**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.

**Math**

-log[7.1x10^-3]

**Chemistry**

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

**Chemistry**

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

**Chemistry**

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

**Chemistry**

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

**Chemistry**

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

**Chemistry**

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

**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

**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

**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

**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.

**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 ...

**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....

**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..

**math**

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

**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

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

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

**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

**math**

ok

**this is wrong**

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

**math**

that is sqrt12 + sqrt18 - sqrt27 + sqrt 50

**math**

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

**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.

**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 h...

**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)

**math**

thnx a lot now i fully understand

**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 ba...

**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

**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 for...

**Math**

is the answer 727.5 thnx

**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...

**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?

**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?

**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.

**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?

**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?

**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.

**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.

**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 yo...

**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 ba...

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