Provide an appropriate response.Light with a wavelength of 6 × 10-4 meters is in the infrared portion of the electromagnetic spectrum. Write 6 × 10-4 in standard form.
A. 0.0006
B. 60,000
C. 0.00006
D. 0.006
Answer: A
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Solve the problem.Bob owns a watch repair shop. He has found that the cost of operating his shop is given by 
where x is the number of watches repaired. How many watches must he repair to have the lowest cost?
A. 20 watches B. 31 watches C. 63 watches D. 39 watches
Use a graphing calculator to graph the system of inequalities.y ? 
xy ? 8
A. 
B. 
C. 
D. 
Find two square roots for the complex number. Write your answer in standard form.
?
?
A. 
B. 
C. 
D. 
E. 
Determine where the function is increasing and where it is decreasing.f(x) = -x2 - 10x
A. increasing on (-5, ?) decreasing on (-?, -5) B. increasing on (-?, 5) decreasing on (5, ?) C. increasing on (5, ?) decreasing on (-?, 5) D. increasing on (-?, -5) decreasing on (-5, ?)