Find the period, amplitude, or shift.Find the amplitude of y = 2 cos (3x - ?).
A. 3
B. 6
C. ?
D. 2
Answer: D
Mathematics
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Find z1z2. Write your answer in standard polar form with the argument in radians.z1 = 2 
, z2 = 5 
A. 7 
B. 7 
C. 10 
D. 10 
Mathematics
Solve.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 16 ft and the vertical clearance must be 12 ft at a point 14 ft from the center. Find an equation for the ellipse.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Perform the indicated arithmetic.13
- 5
A. 7
B. 18
C. 7
D. 17
Mathematics
Use the Factor Theorem to determine whether the linear polynomial is a factor of the second polynomial.x + 5; x3 - 4x2 - 31x + 70
A. Yes B. No
Mathematics