A manufacturer of lighting fixtures has daily production costs of 
where C is the total cost (in dollars) and x is the number of units produced. How many fixtures should be produced each day to yield a minimum cost?
(Round your answer to two decimal places.)
?
A. 160
B. 106.67
C. 320
D. 400
E. 800?
Answer: A
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Determine whether the growth (or decay) is linear or exponential, and answer the associated question.The price of computer memory is decreasing at a rate of 10% per year. If a memory chip costs $79 today, what will it cost in two years?
A. Linear; $94.80 B. Exponential; $71.30 C. Linear; $63.20 D. Exponential; $63.99
Solve.On the morning of December 19 the temperature was -4°F. The next morning the temperature had risen 14°F. What was the temperature on the morning of December 20?
A. -10°F B. 18°F C. -18°F D. 10°F
Write a numerical expression for the phrase and simplify it.Three-eighths of the sum of -4 and -12.
A. 
+ [(-4) + (-12)]; 1
B. 
[(-4) + (-12)]; -12
C. (3 + 8)(-4) + (-12); -56
D. 
[(-4) + (-12)]; -6
Find the standard form of the equation of the hyperbola with vertices: (–4, –4), (0, –4) and asymptotes: 
a. 
b. 
c. 
d. 