Precalculus

A-24 Answers Section 4.229. $20,805.70; $21,103.4831. Approximately 25.96 quadrillion Btu in 1940; approximately 101.59quadrillion Btu in 2000; approximately 291.3% increase; approximately127.53 quadrillion Btu in 201033. Approximately 4.64 hours35.0.5-4-0.2Maximum at approximately (0, 0.40); f (x) approaches 0 as xapproaches 37. a. Approximately 130 students after 2 days; approximately 190students after 5 daysb. 1100-5-100c. Approximately 24 daysd. N(t) approaches 1000 as t approaches .39. True 41. TrueSection 4.2, page 3181. 2.72130 3. 0.17609 5. 0.53959 7. 0.708779. 4 11. Undefined 13. 2 15. 3 17. 219. 3 21. 100 23. 7 25. 2.24 27. 5.6429. 6.75 31. 2 2 1 433. 10 3 100035.37.e 2 x 1x 3 10 39. log 3 9 2 41. log 1/2 8 343. ln 5 x 45. ln 1 2 0.013t47. Domain: (0, )54321–5 –4 –3 –2 –1 1 2 3 4 5–2–3–4–5yg(x) = –ln xx44049. Domain: (3, )–5 –4 –3 –2 –1 1 2 3 4 5–2–3–4–551. Domain: (, 0)53.55.543215432g(x) = ln(–x) 1 – 1–5 –4 –3 –2 –1 1 2 3 4 5–2–3–4–5f 1 (x) 3 x54321–5 –4 –3 –2 –1 1 2 3 4 5–2 f(x) = log 3 x–3–4–5f 1 (x) ln(x 5)54321f –1 (x) = ln(x + 5)x–5 –4 –3 –2 –1 1 2 3 4 5–2–3–4–5yyyyg(x) = ln(x – 3)f –1 (x) = 3 xf(x) = e x – 5xxx