HK Customs Inspector Part I flashcards

24 cards. Read the term and the definition here. The deck at the top of this page is optional.

Variable

A symbol representing a quantity whose permitted values must follow the stated domain and the units of the problem rather than an unstated assumption.

Domain

The allowed inputs or values for a mathematical statement, including any restrictions from the context, a denominator, an even root or a count.

Equation

A claim that two expressions have equal values, whose solutions must make the original relation true and satisfy the declared restrictions.

Inequality

A comparison describing values above or below a boundary, with inclusion or exclusion of the boundary indicated by the relation used.

Function

A rule or relation assigning each permitted input exactly one output, distinguished from a general relation that may assign multiple outputs to one input.

Slope

The change in the vertical variable divided by the change in the horizontal variable between appropriate points on a nonvertical line.

Intercept

A point where a graph meets a specified coordinate axis, whose interpretation depends on the variable definitions and whether that point belongs to the model domain.

Factor

A multiplicative component of an expression or integer, distinguished from a term separated by addition when deciding whether cancellation is valid.

Equivalent expressions

Expressions that represent the same value on the relevant common domain, with any original exclusions preserved when a simplification changes the displayed form.

Ratio

A comparison by division between quantities, interpreted with the quantities in the stated order and with compatible units when required.

Percent change

A relative increase or decrease calculated by dividing the difference by the specified baseline, then expressing that fraction per hundred.

Percentage point

A unit for the arithmetic difference between two percentages, distinct from the relative percent change obtained by dividing by a baseline.

Aspect

The way a verb phrase presents an event or state in relation to time, such as ongoing, completed or connected with the present.

Collocation

A conventional combination of words whose natural use is learned in context, rather than created by substituting any dictionary synonym.

Register

Language choices suited to the situation, audience, purpose and relationship, such as a formal request or an informal message to a friend.

Conditional

A construction linking a condition with a result, whose forms help express real possibilities, imagined situations or unreal past events.

Word formation

Creating a suitable grammatical word form, such as a noun or adjective, while preserving the meaning required by the complete sentence.

Inference

A conclusion reasonably supported by the given text, distinguished from a directly stated detail or an unrelated assumption based on outside knowledge.

Tone

The attitude conveyed by wording, structure and other textual choices, which should be explained with evidence rather than guessed from the topic alone.

Narrator

The voice or figure presenting a narrative, which must be distinguished from the author and from every character's view within the story.

Premise

A statement supplied as a starting condition in a reasoning exercise, which must be distinguished from an independently established fact about actual professional practice.

Counterexample

A permitted instance that obeys the stated conditions but makes a proposed universal conclusion false, showing why that conclusion does not follow necessarily.

Reference frame

The fixed viewpoint and coordinate conventions used to describe position or movement, which must remain consistent while an object undergoes a transformation.

Document discrepancy

A difference between supplied records that calls for checking the source and context, without itself establishing who is responsible or whether an offence occurred.