Multiply using the lattice method.21 × 18
A. 478
B. 388
C. 368
D. 378
Answer: D
Mathematics
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Provide an appropriate response.The following equations each describe the motion of a particle. For which path is the particle's velocity vector always orthogonal to its acceleration vector?(1) r(t) = t6i + t6j(2) r(t) = cos (8t)i + sin (9t)j(3) r(t) = ti + t3j(4) r(t) = cos (-4t)i + sin (-4t)j
A. Path (4) B. Path (1) C. Path (3) D. Path (2) and Path (4)
Mathematics
Express the area of the region bounded by the given line(s) and/or curve(s) as an iterated double integral.The curve 
and the lines 
and 
A. 
B. 
C. 
D. 
Mathematics
Simplify the expression by combining like terms.- 
+ 5y + 
y - 13 + 
y
A. 
y - 
B. 
+ 6
C. 
y - 6
D. 7y
Mathematics
Multiply and then, if possible, simplify by factoring.
A. 10x
B. 10
C. 100
D. 
x
Mathematics