Explaining a Working Model

3 questions. Choose the meaning or usage that best fits each situation. Try answering before reopening the passage.

1Why is the credit sequence exponential in the stated sense?A. Each equally spaced round retains the same proportion, three quarters, of the previous amount.B. The values grow very rapidly without a consistent proportional rule.C. Each round subtracts the same absolute number of credits.D. The sequence contains numbers, which makes every numerical change exponential.

2A completed tunnel that visitors can physically touch is a _____ result.A. imagined onlyB. tangibleC. hypotheticalD. unrealized

3Which component is insubstantial in the physical sense used here?A. A flimsy tissue support that lacks enough solidity to hold the model cart.B. A component considered weak solely because its color is unpopular.C. A firm support that carries the cart without deforming in the stated test.D. A detailed arithmetic rule recorded accurately on a separate card.

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