Is the graph shown in Figure one-to-one?

No, because it does not pass the horizontal line test.
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Answer:
The number of cubic yards of dirt, D, needed to cover a garden with area a square feet is given by D=g(a).
A garden with area 5000 ft2 requires 50 yd3 of dirt. Express this information in terms of the function g.
Explain the meaning of the statement g(100)=1.