Write each rate as a unit rate as a phrase, and determine which is a better buy.A case of 36 bottles of IceMan'water costs $4.68. A case of 20 bottles of Big Mountain water costs $3.20.
A. IceMan: $4.68 per bottle; Big Mountain: $3.20 per bottle. IceMan water is the better buy.
B. IceMan: $0.16 per bottle; Big Mountain: $0.13 per bottle. Big Mountain water is the better buy.
C. IceMan: $0.13 per bottle; Big Mountain: $0.16 per bottle. IceMan water is the better buy.
D. IceMan: $0.13 per bottle; Big Mountain: $0.11 per bottle. Big Mountain water is the better buy.
Answer: C
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Solve the problem.The accompanying figure shows the graph of y = x2 shifted to a new position. Write the equation for the new graph.
A. y = (x - 5)2 B. y = x2 - 5 C. y = x2 + 5 D. y = (x + 5)2
Perform the indicated operation and write the answer in simplest form.
? 
A. 
B. z
C. z2
D. z3
Find the unit tangent vector of the given curve.r(t) = (6 - 2t)i + (2t - 2)j + (3 + t)k
A. T(t) = 
i - 
j - 
k
B. T(t) = - 
i + 
j + 
k
C. T(t) = - 
i + 
j + 
k
D. T(t) = 
i - 
j - 
k
Find the focus and directrix of the parabola.y2 = -28x
A. F: (-7, 0); D: y = 7 B. F: (7, 0); D: x = -7 C. F: (-7, 0); D: x = 7 D. F: (0, -7); D: y = 7