Find the derivative.y = 
A. 
B. 
C. 
D. 
Answer: A
Mathematics
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Solve the problem.For what value of r does the infinite series 1 + 4r + r2 + 4r3 + r4 + 4r5 + r6 + . . . converge?
A. |r| < 1
B. |r| < 
C. |r| < 2
D. |r| < 4
Mathematics
Determine, without graphing, whether the given quadratic function has a maximum value or a minimum value and then find that value.f(x) = -x2 - 2x - 8
A. minimum; - 1 B. minimum; - 7 C. maximum; - 7 D. maximum; - 1
Mathematics
Solve the equation.36y2 = 25
A. - 
, 
B. 
C. 
D. - 
, 
Mathematics
Use the sum and difference identities to evaluate exactly.cos 165°
A. 
B. 
C. 
D. 
Mathematics