Find the exact value of the expression or state that it does not exist.cos-1
A. 
B. - 
C. 
D. 
Answer: D
Mathematics
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Solve the problem.A fossilized leaf contains 12% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as the half-life of carbon 14.
A. 36,108 B. 1031 C. 17,099 D. 20,040
Mathematics
Decide whether or not the ordered pair is a solution of the system.(-5, 2)x + y = 7x - y = 3
A. Yes B. No
Mathematics
Solve the equation.
x - 
x = 11
A. {15}
B. 
C. 
D. {165}
Mathematics
Find the inverse of the matrix A, if it exists.A = 
A. A-1 = 
B. A-1 = 
C. A-1 = 
D. A-1 does not exist.
Mathematics