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Fall 2005 Math 151 Week in Review - Solutions − sin(ln t) t 1 b.) h0 (x) = x ln x 1. a.) f 0 (t) = 2x3 2x + 1 d.) *Use properties of logarithms to simplify the expression.* 3 x y0 = 2 − x + 1 2(3x − 5) −3x2 e.) f 0(x) = (3 − x3) ln 2 10. f.) f 0(x) = ln 9 sec2 (2x)3tan 2x sin x ) g.) y 0 = xsin x(cos x ln x + x 11. 2 2. y = 3x − e 12. ln 2 3. m = 4 13. t 4. a.) y(t) = 4000(9 ) c.) f 0(x) = 3x2 ln(2x + 1) + b.) 8320 bacteria c.) t ≈ 43.95 minutes 5. 121.9 mg 6. y = 5e2t 7. y(2) ≈ 8.26◦ 8. a.) Approximately 301.64 kg of salt b.) approximately 30.41 minutes. π 9. a.) 6 π b.) 4 π c.) − 3 π d.) 3 e.) 3 5 1 1 + x2 2π g.) 3 π h.) − 4 i.) 0.4 π j.) − 6 3π k.) 4 √ 2 8 l.) 9 1 y0 = √ 2 x(1 + x) √ π 3 (x − 1) y− = 6 3 0 ≤ x ≤ 1, all real numbers. π 2 f.) √