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Which graph shows a function with a range of all real numbers greater than or equal to -1

He amount of carbon-14 present in animal bones t years after the animal's death is given by p(t)equals=upper p 0 e superscript negative 0.00012097 tp0e−0.00012097t. how old is an ivory tusk that has lost 26% of its carbon-14?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?