Find the unit vector having the same direction as v.v = -28i + 28j -14k
A. 
= - 
i + 
j - 
k
B. 
= - 
i + 
j - 
k
C. 
= 
i + 
j + 
k
D. 
= - 
i + 
j - 
k
Answer: B
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Solve the problem.The formula for computing a car's gas mileage is 
where E is the ending odometer reading, B is the beginning odometer reading, G is the number of gallons of gasoline used for the trip, and M is the gas mileage. Find the mileage for a trip for which E = 27,733.7, B = 27,152.7, and G = 17.5. Round to the nearest tenth.
A. 33.5 mpg B. 34.2 mpg C. 33.2 mpg D. 32.5 mpg
Solve.A wall in Alex and Carla Dinu's garden is to be built using brick that is 3
inches wide and a mortar joint that is 
inch wide. Use the diagram to find the height of the wall.
A. 20
in.
B. 20
in.
C. 21
in.
D. 21
in.
Solve the problem.If 5-x = 
, what does 25x equal?
A. 5
B. -25
C. 
D. 25
Decide whether the matrices are inverses of each other. (Check to see if their product is the identity matrix I.)
and 
A. Yes B. No