The spin cycle of a clothes washer operates for 3minutes at a power of 300w. the useful output from the washer is 40kj. what is the efficiency of the washer? (note that 1kwh = 3600000j)

its c i just checked it

i think it would be 5

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .

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