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20% efficiency means that 20% of the electrical energy going into the lamp is transfered to light, and 80% of the energy is lost/wasted.

if (X-2) is a factor, f(2)=0

22^3-72^2+4*2+4= 16-28+8+4=0

therefore (x-2) is a factor.

2x^3-7x^2+4x+4=(x-2)(2x^2-3x-2)=(x-2)(2x+1)(x-2)

Because there are two forms of x , the form uv'+vu' must be used.

If y=sinx , dy/dx=cosx 

If y=e^kx , dy/dx=ke^kx

Therefore dy/dx=(sinx)(2e^2x)+(e^2x)(cosx)

Firstly it would be useful to define terms and state that the majority of the time the tax in question will be a tax on a good or service for example the tax on cigarettes (tobacco). The reason that this ...

Firstly, I would make sure that the student is aware of the basic conept of logarithims and run through the basic "laws" of logarithims to make sure that they have the knowledge they need to ans...