Solve the problem.The graph shows the total sales in thousands of dollars from the distribution of x thousand catalogs. At what values is the function not differentiable?
A. 10, 20, 30, 40, 50
B. 10, 20, 40
C. Function is differentiable for all x in the domain
D. 20, 30
Answer: C
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Write the phrase as a variable expression. Use x to represent "a number."The sum of a number and 79
A. x + 79 B. 79 C. x - 79 D. 79x
Use a calculator to find the natural logarithm correct to four decimal places.ln 0.000387
A. 3.4123 B. 7.8571 C. -3.4123 D. -7.8571
Solve the problem.A thermometer reading 
is placed inside a cold storage room with a constant temperature of 
If the thermometer reads 
in 5 minutes, how long before it reaches 
Assume the cooling follows Newton's Law of Cooling: U = T + (Uo - T)ekt.(Round your answer to the nearest whole minute.)
A. 45 minutes B. -16 minutes C. 14 minutes D. -1 minutes
Evaluate the sum.
A. 601 B. 636 C. -75 D. -46