Use logarithms to solve the equation. Round your answer to four decimal places.
?
?
A. 
B. 
C. 
D. 
E. 
Answer: B
Mathematics
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Evaluate.cos 
A. - 
B. 
C. 
D. 1
Mathematics
Round to the nearest hundredth.1.453
A. 1.45 B. 1.44 C. 1.46 D. 1.5
Mathematics
Find the vertex, focus, and directrix of the parabola.
?
?
A. Vertex:
; Focus: 
; Directrix: 
B. Vertex:
; Focus: 
; Directrix: 
C. Vertex: 
; Focus: 
; Directrix: 
D. Vertex:
; Focus: 
; Directrix: 
E. Vertex:
; Focus: 
; Directrix: 
Mathematics
Solve the problem.A company installs 5000 light bulbs. Each bulb has an average life of 500 hours with a standard deviation of 100 hours. The life of each bulb is approximated by a normal curve. Find the number of bulbs that can be expected to last less than 500 hours.
A. 3000 B. 2500 C. 2400 D. 1000
Mathematics