Calculate the direction of 
and the midpoint of line segment P1P2. P1(6, -8, -1) and P2(9, -12, -6)
A. 
i - 
j - 1
k; 
B. 
i - 
j - 
k; 
C. 
i - 
j - 
k; 
D. 
i - 
j - 1
k; 
Answer: D
Mathematics
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A. base B. portion C. rate
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Solve the equation.2(7 - 3x) = 
A. 3
B. 1
C. 
D. -3
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Solve the problem.The focal length f of a lens with index of refraction n is 
= (n - 1)
where R1and R2 are the radii of curvature of the front and back surfaces of the lens. Express f as a rational expression.
What will be an ideal response?
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Fill in the blank with one of the words or phrases listed below.
In the percent proportion 
= 
.
A. 
B. 
C. 
D. 
Mathematics