Graph the polar equation for ? in [0°, 360°).r = 5 (cos ? + cos 2?)
A. 
B. 
C. 
D. 
Answer: A
Mathematics
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The half-life of a certain radioactive substance is 5 years. What is the yearly percentage decay rate for this substance? Round your answer to two decimal places if necessary. ?
A. 10.65% B. 12.94% C. 13.87% D. 10%
Mathematics
A solution has a hydroxyl ion concentration of 8.33 × 10-14. Find the hydrogen ion concentration in this solution.
A. 1.2 × 10 [H+] B. 0.012 mol/L [H+] C. 1.2 × 10-1 mol/L [H+] D. 1.2 mol/L [H+]
Mathematics
Find the standard form of the equation of the ellipse.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Identify the equation as either an identity or not.tan2x = sec2x - sin2x - cos2x
A. Identity B. Not an identity
Mathematics