Find the exact value of the expression.sec
A. 0
B. 2
C. 1
D. 
Answer: B
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Solve the given differential equation. (The form of yp is given.)D2y - 2Dy + y = x2 + 2x + sin 2x(Let yp = Ax2 + Bx + C + E sin 2x + F cos 2x.)
A. y = c1ex + c2xex + 6x2 + 6x + 10 sin 2x + 
cos 2x
B. y = c1ex + c2xex + 6x2 + 6x + 10 + 
sin 2x + 
cos 2x
C. y = c1ex + 6x2 + 6x + 10 - 
sin 2x + 
cos 2x
D. y = c1ex + c2xex + 6x2 + 6x + 10 - 
cos 2x + 
sin 2x
For the curve r(t), write the acceleration in the form aTT + aNN.r(t) = (2t sin t + 2 cos t)i + (2t cos t - 2 sin t)j + 7k
A. a = 2T + 2tN
B. a = 
N
C. a = 2T + 
N
D. a = 2tN
In a school survey, students showed these preferences for instructional materials. Answer the question.
About how many students would you expect to prefer films in a school of 900 students?
A. About 20 students B. About 162 students C. About 108 students D. About 180 students
Find the exact value of the expression.sin 25° cos 35° + cos 25° sin 35°
A. 
B. 
C. 
D. 