where q represents the quantity remaining after t years and k is the decay constant 0.00043. how long will take for 500g of radium to decay to 5g

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step-by-step explanation:

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graph #4 (last graph) depict the function   f(x)= -m(x-d)^1/5 i

step-by-step explanation:

we know that

m=slope

but in this function slope is -m that means slope is decreasing and it is decreasing by 1/5 points down the x-axis.

which is shown in graph four

a decreasing slope down x-axis by 1/5 points.

hence 4th graph is the right option for this.

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