Using a sum or difference identity, write the following as an expression involving functions of ?.sin (? + 45°)
A. sin ?
B. -cos ?
C. 
cos ? + 
sin ?
D. 
cos ? - 
sin ?
Answer: C
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Evaluate the function for the given value. Round to the nearest thousandth.f(x) = ex; f(3.9)
A. 0.471 B. 49.402 C. 1.361 D. 54.598
Use the shell method to find the volume of the solid generated by revolving the region bounded by the given curves and lines about the x-axis.x = 18 - y2, x = y2, y = 0
A. 
?
B. 81?
C. 162?
D. 
?
Write the phrase as a mathematical expression. Use x to represent the number. Combine like terms if possible.6 times a number added to -8, added to 6 times the sum of 9 times the number 
A. 6x - 8 + 6(9 + 7x); 48x + 60 B. 6(-8 + x) + 6(9x + 7); 60x - 41 C. 6(9x + 7) + [6x + (-8)]; 60x + 34 D. 6(-8 + x) + 6(9 + 7x); 13x + 6
Perform the indicated operations. Write the answer using only positive exponents. Assume all variables represent positive real numbers.
? 
A. 
B. x22/7
C. x11/5
D. 