Solve the problem.Suppose that the dollar cost of producing x radios is 
Find the marginal cost when 30 radios are produced.
A. $820
B. $32
C. -$820
D. $8
Answer: D
Mathematics
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Multiply and simplify. Write the answer as a mixed number if possible.1
? 
A. 
B. 
C. 1
D. 3
Mathematics
Find the standard form of the equation of the ellipse and give the location of its foci.
Center at (-1, 1)
A. 
+ 
= 1
foci at (-1 + 3
, 1) and (-1 - 3
, 1)
B. 
+ 
= 1
foci at (- 3
, 1) and (3
, 1)
C. 
+ 
= 1
foci at (-1 + 3
, -1) and (-1 - 3
, -1)
D. 
+ 
= 1
foci at (1 + 3
, -1) and (1 - 3
, -1)
Mathematics
Solve the equation.
= 
A. 
B. 
C. 
D. {7}
Mathematics
Simplify the expression.tan 
[tan x + cot x]
A. csc2x B. sin2x C. tan2x D. sin x - csc x
Mathematics