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: B
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Determine whether the activity can be used to illustrate the given property.Making a pot of coffee, brushing your teeth, and taking a shower.Does the associative property hold?
A. Yes B. No
Indicate whether the equation illustrates the commutative property of addition, commutative property of multiplication, associative property of addition, associative property of multiplication, or the distributive property.4.5 + (-5 + (-0.1)) = (4.5 + (-5)) + (-0.1)
A. Distributive property B. Commutative property of addition C. Associative property of addition D. Associative property of multiplication
Determine whether the given function is even, odd, or neither.f(x) = 2x2 - 2
A. Even B. Odd C. Neither
Begin by drawing a rough sketch to determine the number of real solutions for the equation y1 = y2. Then use an analytic method to confirm your answer. Give the solution set and any extraneous values that may occur.y1 = 
y2 = x + 4
A. 
No real solutions; ?; no extraneous values
B. 
One real solution; 
; 
is extraneous.
C. 
One real solution; {1}; no extraneous values
D. 
Two real solutions; 
; no extraneous values