Consider a soldier facing in a given direction (say north). Let us denote "left face" by l, "right face" by r, "about face" by a, and "stand fast" by f. (The element f means "don't move from your present position." It does not mean "return to your original position.") Then we define 
and an operation 
meaning "followed by." Thus, ![]()
data-wiris-created="true" src="https://sciemce.com/media/3/ppg__cognero__5.1_Natural_Numbers__media__b7a05c3d-45f5-4d96-a61f-68bd26c98133.PNG" style="vertical-align:middle;" /> means "left face" followed by "left face" and is the same as the single command "about face." Does the set H and operation satisfy the associative property?
?
A. no
B. yes
Answer: B
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Solve.A fish tank holds 6.0 liters of water. How many gallons does the tank hold, to the nearest tenth?
A. 6.4 gal B. 1.6 gal C. 5.7 gal D. 22.7 gal
Simplify the expression.
2
A. 12
B. 
C. 2
D. 
A triangle with vertices at (x1, y1), (x2, y2), and (x3, y3) has area equal to the absolute value of D, where D = 
.Find the area of the triangle having vertices at P, Q, and R.P(1, -2), Q(1, 3), R(5, -1)
A. 7 B. 0 C. 20 D. 10
Graph the equation by plotting points.y = x2 - 2
A. 
B. 
C. 
D. 