Change the logarithmic expression to an equivalent expression involving an exponent.logb 81 = 4
A. 81b = 4
B. 4b = 81
C. 814 = b
D. b4 = 81
Answer: D
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Use a graphing calculator to solve the problem.Let f(x) = sin 
+ cos x on the interval I = (0, 7). Use the graph to estimate where f''(x) < 0 on I.
A. (0, 1.77) ? (4.52, 7) B. (0, 5.77) C. (1.77, 4.52) D. (0, 3.14) ? (3.14, 7)
Suppose the figure below is an exaggerated diagram of a plane flying above the earth. If the plane is 4.25 miles above the earth and the radius of the earth is 4,000 miles, how far is it from the plane to the horizon? Round your answer to the nearest mile.
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A. 199 mi B. 174 mi C. 183 mi D. 184 mi E. 187 mi
Solve.If a computer can do one calculation in 1.4 × 10-9 seconds, how long will it take the computer to perform 10,000 calculations? Write your answer in scientific notation.
A. 1.4 × 10-5 sec B. 1.4 × 10-36 sec C. 1.4 × 10-13 sec D. 1.4 × 10-6 sec
How many years will it take $6,000 to grow to $9,246 if it is invested at an annual rate of 17%, compounded continuously? Round your answer to one decimal place.
A) 1.5 years B) 2.0 years C) 2.5 years D) 3.0 years