# Decay Questions

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## Latest Questions

### Is it Black Tartar on my tooth? Or Decay?

There's a black line I see between my tooth and my gum. I've thought it's a vein but I took a closer look and there's black stuff ...

### Math help please?

1.Which functions represent exponential decay? f(x)=5⋅(1/8)x f(x)=(1/5)⋅3x f(x)=5⋅(2/3)x f(x)=4⋅(1/5)x f(x)=2⋅5x ...