Calculate the unit vector u = (cos ?)i + (sin ?)j for the given direction angle.? = 
A. 
i - 
j
B. - 
i - 
j
C. - 
i + 
j
D. 
i + 
j
Answer: C
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Provide an appropriate response.Which of the following is not a condition for applying the integral test to the sequence {an}, where 
I. f(x) is everywhere positive II. f(x) is decreasing for x ? N III. f(x) is continuous for x ? N
A. I only B. III only C. II only D. All of these are conditions for applying the integral test.
Use a graphing calculator to solve the system of equations. Round your solutions to one decimal place.1.1x + 0.8y - 2.0z = 2.74.8x - 7.0y - 0.2z = -2.73.7x - 2.0y + 0.2z = 11.0
A. (3.6, 2.7, 2.0) B. (2.4, 1.8, 1.3) C. (1.2, 0.9, 0.7) D. (4.8, 3.6, 2.7)
Multiply and simplify.
? 
A. 1
B. 
C. -1
D. 0
Find the matrix product AB, if it is defined.A = 
, B = 
.
A. 
B. AB is undefined.
C. 
D. 