07/03/15

Kinematics
A particle moves in a straight line so that , t seconds after passing through O, its velocity, v m/s , is given by v=t^2-8t+7. The particle comes to an instantaneous rest, firstly at A then at B.... more
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07/03/15

Kinematics
A particle P moves in a straight line so that , after t seconds, its displacement, x metres, from a fixed point O is given by the equation x=12sin(2t)-6 . Determine   (a) expressions for the... more
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07/02/15

Relative Velocity
An aircraft leaves A to fly to B which is 100 km due North of A. The pilot sets a course due North but after 15 minutes he realizes that, owing to a wind blowing from due East, the plane is at a... more
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06/30/15

Text Messages
Vin pays Verizon a monthly fee of $55 for his cell phone. He also pays $0.30 for each text. If his cell phone bill for October is $90.10, how many text messages did he send?     Write an equation... more
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06/30/15

solve problem
In a circle of radius 120 cm, an arc 344 cm long subtends an angle of how many radians? How many degrees? The arc subtends an angle of _____radians               How many... more
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06/29/15

please help!!!!!!!
1.) A mixture of 4% disinfectant solution is to be made from 6% and 3% disinfectant solutions. How much of each solution should be used if 27 gallons of 4% solution are needed? 2.) How many liters... more
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06/24/15

distance-rate-time,interest,average,cost
Two planes, which are 2340 miles apart, fly toward each other. Their speeds differ by 35 mph. If they pass each other in 4 hours, what is the speed of each?
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06/24/15

How do you convert kg/m^3 to slug/ft^3? and kg/m^3 to lb/inch^3?
I was given this worksheet in class and my professor refuses to explain it to us. I need help!!    For the given sample: Wooden cube (rectangular). Measure its mass in grams = 171 grams. Find... more
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06/24/15

If Anne gives John $66, Anne will have the same amount of money as John. If John gives Anne $20, the ratio of Anne's money to John's money is 7:3.
Question: How much money does Anne has?   Give here give there, too less info for me to solve. :(
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06/24/15

Susan had a total of 204 red and green pens. She gave away 1/4 of the red pens and 1/2 of the green pens. She gave away 64 pens in total.
Question: How many green pens did she give away?   Too less information for me to solve...
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06/23/15

physics velocity help needed please
A stuntman plans to run across a roof top and then horizontally off it to a land  on the roof of the next building . The roof of the next building is 4.9 m below the first one and 6.2 m away from... more
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06/22/15

If y= log(x+(v1+x²)) prove that dy/dx= 1/log(x+v1+x²)*1/v1+x²
im struck with this ques please help me out !!!!! please give a detail answer tried much but always wrong.  
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06/21/15

Physics help!
A small loop of wire with radius 2 cm is placed in a uniform upward magnetic field. By what factor does the flux change if the radius of the loop is increased to 8 cm?    
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06/21/15

If toy is switched on & allowed to travel in straight lines for 2 min, how many feet will it travel?
The wheels of a toy car have a diameter of 3/pi inches. When the toy's motor is switched on, the wheels revolve 10 times per second.  (these are the first parts of the question)   thanks for... more
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06/21/15

If f (x) =-x^2+2, find the equation tangent to f (x) at the point (1,1)
High school student 
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06/21/15

How does (1-cos2x)^2=4sin^4x
The actual question is limx->0 xtan2x-2xtanx/(1-cos2x)^2  
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06/21/15

Chemistry help please...
Antacid supplement contains calcium carbonate as the active ingredient.One antacid tablet which weighs 1.998 g is reacted with HCl (aq) excess and produces 0.22 g of CO2.What is the percentage of... more
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06/20/15

Determin the limit using L'Hopital's Rule
lim   1-cos(3x)/x^2 x→0   I took the derivative and got 3sin(3x)/2x, when I plug in zero I get 0/0 I took the derivative a second time and got 9cos(3x)/2, plugged in 0 and got 0/2 I took the... more
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06/20/15

Allison replaced 100-watt fixture with 15 watt fixture.she estimated that fixture will burn 2000 h per year and that annual ..
Allison replaced 100-watt fixture with 15 watt fixture.she estimated that fixture will burn 2000 h per year and that annual savings will be $20.40 What is the cost of her electricity per... more
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06/20/15

Limits Question (dividing by zero?)
Calculate: lim x->0 (sin4x2)/(x2)   I've seen an explanation of the problem and it says the answer is 4. I just don't understand what you're supposed to do after u-substitution. More... more
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06/20/15

in a diagram, ABC is a triangle.
ABC is a triangle. ACD is a straight line. Angle CAB=50° Angle ABC=60°   Work out the size of the angle marked x       x is marked on the straight line, between C and D 
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06/20/15

Trigonometry
Can someone explain Trigonometry to me? Bitesize and Mymaths doesn't help at all!   Like you know the SOH CAH TOA thing and the hypotenuse adjacent and opposite thing
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06/18/15

Calculus-Asymptote
Under certain laboratory conditions, an agar plate contains B(t) = 400(3 − e^-t) bacteria t hours after the start of the experiment.a. How many bacteria are on the plate at the start of the... more
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06/18/15

In ?XYZ, ?Y=90° and ?X=53°. ?ZWY=86° and XW=7.5. Find the length of WY to the nearest 10th.
In ΔXYZ, ∠Y=90° and ∠X=53°. ∠ZWY=86° and XW=7.5. Find the length of WY to the nearest 10th.
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06/18/15

In ?XYZ, ?X=72° and ?Y=72°. ?XWZ=90° and XY=8.5. Find the length of ZW to the nearest 10th.
In ΔXYZ, ∠X=72° and ∠Y=72°. ∠XWZ=90° and XY=8.5. Find the length of ZW to the nearest 10th.
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