Evaluate.4 ? 5 + 5(7 - 6) + 3
A. 40
B. 43
C. 52
D. 28
Answer: D
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Calculate the arc length of the indicated portion of the curve r(t).r(t) = 
t3/2i + (5t sin t)j + (5t cos t)k ; -3 ? t ? 6
A. 240 B. 127.5 C. 112.5 D. 180
Solve the equation.7(2x + 1) + 9(2x + 1) = 144
A. 4 B. 6 C. 3 D. 5
The following system does not have a unique solution. Solve the system.
A. infinitely many solutions of the form x = 20 - 
z, y = 3 - 
z, z = z
B. infinitely many solutions of the form x = 20 + 
z, y = -3 - 
z, z = z
C. infinitely many solutions of the form x = 20 + 
z, y = 3 - 
z, z = z
D. infinitely many solutions of the form x = 20 + 
z, y = 3 + 
z, z = z
Write the system of linear equations that the augmented matrix represents. Use the variables x, y, and z.
A. 4x - 5y = -7 -6x + 8y = 5 B. -5x + 4y = -7 -6x + 8y = 5 C. 4x - 5y = -7 8x - 6y = 5 D. 4x - 5y = 7 -6x + 8y = -5