Solve the system of equations by the elimination method.
x - 
y = -21
x + 
y = -7
A. (9, -12)
B. (-12, -9)
C. (-12, 9)
D. (12, 9)
Answer: C
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The function s = f(t) gives the position of a body moving on a coordinate line, with s in meters and t in seconds.s = 7t - t2, 0 ? t ? 7Find the body's speed and acceleration at the end of the time interval.
A. 7 m/sec, -14 m/sec2 B. 21 m/sec, -14 m/sec2 C. 7 m/sec, - 2 m/sec2 D. -7 m/sec, - 2 m/sec2
Perform the indicated operations. Write the result in the form a + bj.
A. - 
B. 
C. 
D. - 
Find the first three nonzero terms of the Maclaurin expansion of the given function.f(x) = sin(3?x)
A. 3?x - 
?3x3 + 
?5x5 - ...
B. 3x - 
x3 + 
x5 - ...
C. 3?x - 27?3x3 + 243?5x5 - ...
D. 3?x - 9?3x3 + 
?5x5 - ...
Each line contains the given points. Find the slope of each line to determine if the lines are parallel, perpendicular, or neither.L1: (-4, 7) and (10, 15)L2: (9, -3) and (13, 4)
A. neither B. parallel C. perpendicular