Solve the equation by completing the square.p2 + 3p - 9 = 0
A. 
B. {-3 ± 3
}
C. 
D. 
Answer: A
Mathematics
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Solve the problem.The amount of a certain radioactive isotope present at time t is given by 
grams, where t is the time in years that the isotope decays. The initial amount present is 400 grams. How many grams remain after 20 years? Round to the nearest hundredth.
A. 379.25 g B. 397.87 g C. 234.78 g D. 681.48 g
Mathematics
Use a sum or difference identity to find the exact value.tan 
A. -2 + 
B. 2 - 
C. 2 + 
D. -2 - 
Mathematics
Find the length of the section represented by x in the figure. 
a = 2
b = 13
A. 7
B. 13
C. 8
D. 19
Mathematics
Find the product.
A. 
B. 
C. 
D. 
E. 
Mathematics