Solve the equation.20r2 = 5r
A. {0}
B. 
C. {0, 4}
D. 
Answer: D
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Evaluate the expression by first changing the form. Verify the answer by use of a calculator. sin 25° cos 35° + cos 25° sin 35°
A. 
B. 
C. 
D. 
Sketch the graph of the function and find the domain and range.f(x) = (x + 3)2 - 1
A. 
domain: {x|-? < x < ?}
range: {y|y ? -1}
B. 
domain: {x|-? < x < ?}
range: {y|y ? 3}
C. 
domain: {x|-? < x < ?}
range: {y|y ? 1}
D. 
domain: {x|-? < x < ?}
range: {y|y ? -3}
Provide an appropriate response.The total sales x ( in hundred thousands) for a video cassette t months after the video is released can be approximated by x = 
. Use logarithmic differentiation to find 
.
What will be an ideal response?
Find the common ratio for the geometric sequence.-7, -14, -28, -56, -112, . . .
A. r = -14 B. r = 2n C. r = -2 D. r = 2