AccelePrep for the ACT Test 2nd Edition Student Text

106 • S URGE TO S UCCESS ! M ATH T EST P REP

8. The cost of making a call using a phone card is $0.15 for dialing and $0.04 per minute once connected. Which of the following equations …‘—Ž† „‡ —•‡† –‘ ϐ‹† –Š‡…‘•–ǡ ‹ †‘ŽŽƒ”•ǡ ‘ˆ ƒ…ƒŽŽ ™‹–Š ƒ…‘‡…–‹‘ time of x minutes long? F. ( . . ) y x 0 04 0 15 G. . . y x 0 04 0 15 H. . . y x 0 04 0 15 Ǥ . . y x 0 15 0 04 K. . . y x 0 04 0 15 Ž—‰Ǧƒ†Ǧ Š—‰…ƒ ƒŽ•‘ „‡ —•‡ˆ—Ž ˆ‘” •‘Ž˜‹‰ •‘‡ ‘ˆ –Š‡ ‘”‡ †‹ˆϐ‹…—Ž– “specialty” items that test a particular math concept such as absolute value. 9. For all nonzero values of a and b , which of the following expressions is always positive? A. a b B. a b C.

Example:

STRATEGY ALERT Solve absolute value problems by assuming numerical values for variables.

a b D. a b E.

a b

TEST-THE-TEST

Another alternative strategy that also uses the multiple-choice structure of the test is Test-the-Test. Some problems involving variables ask you to choose a numerical value as an answer. 10. If x x 2 3 7 5 , then x = F. 2 5 Examples:

STRATEGY ALERT Test-the-Test. The correct answer to any item is always ‘‡ ‘ˆ ϐ‹˜‡ ‰‹˜‡…Š‘‹…‡•Ǥ To Test-the-Test, plug the answer choices back into the item until a choice returns a true statement, or check each answer choice against any stated conditions.

G. 5 2 H. 1 Ǥ 5 2 K. 2 5