Victory for the ACT Student Text 15e

390 • C AMBRIDGE P RACTICE T EST R EINFORCEMENT

49. Š‡ ƒ˜‡”ƒ‰‡ –‡’‡”ƒ–—”‡• ˆ‘” ͷ †ƒ›• ™‡”‡ ͺʹι ǡ ͺ͸ι ǡ ͻͳι ǡ ͹ͻι ǡ ƒ† ͻͳι Ǥ Šƒ– ‹• –Š‡ ‘†‡ ‘ˆ –Š‡•‡ –‡’‡”ƒ–—”‡•ǫ Ǥ ͹ͻι Ǥ ͺʹι Ǥ ͺͷǤͺι Ǥ ͺ͸ι Ǥ ͻͳι 50. „‘‘Ž‡–…‘–ƒ‹• ͵Ͳ ’ƒ‰‡•Ǥ ˆ ͻ ’ƒ‰‡• ‹ –Š‡ „‘‘Ž‡– Šƒ˜‡ †”ƒ™‹‰•ǡ ™Šƒ– ’‡”…‡–ƒ‰‡ ‘ˆ –Š‡ ’ƒ‰‡• ‹ –Š‡ „‘‘Ž‡– Šƒ˜‡ †”ƒ™‹‰•ǫ Ǥ 30% Ǥ 9% Ǥ 3% Ǥ 1% Ǥ 10 3 Š‹…Š ‘ˆ –Š‡ ˆ‘ŽŽ‘™‹‰ ”‡’”‡•‡–• t t 7 6 3 2 − + − ™Š‡ ‹– ‹•…‘’Ž‡–‡Ž› ˆƒ…–‘”‡†ǫ Ǥ ( ) ( ) t t 3 1 2 3 − + Ǥ ( ) ( ) t t 3 1 2 3 + − Ǥ ( ) ( ) t t 6 1 3 − + Ǥ ( ) ( ) t t 6 1 3 + − Ǥ ( ) ( ) t t 2 1 3 3 − + 52. Šƒ– ‹• –Š‡ •‘Ž—–‹‘ •‡– ‘ˆ 2 2 x x 2 1 2 = + − ? Ǥ ȓͳȔ Ǥ ȓ 1 Ȕ Ǥ ȓͳǡ 1 Ȕ Ǥ ȓʹȔ Ǥ Š‡ ‡’–› •‡– 53. ‡••‹…ƒ ‹• ͵ ›‡ƒ”• ›‘—‰‡” –Šƒ ‘•Š—ƒǤ ˆ x ”‡’”‡•‡–• ‘•Š—ƒǯ• ƒ‰‡ ‘™ǡ ™Šƒ– ™ƒ• ‡••‹…ƒǯ• ƒ‰‡ ˆ‘—” ›‡ƒ”• ƒ‰‘ ‹ –‡”• ‘ˆ x ? Ǥ x 51.

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1 Ǥ x 3 Ǥ x Ͷ Ǥ x ͸ Ǥ x ͹

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