?Find the characteristic equation of the matrix 
.
?
A. ?
B. ?
C. ?
D. ?
E. ?
Answer: D
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Check the addition. If the answer is incorrect, find the correct answer.
1309
A. Correct B. Incorrect; should be 1419 C. Incorrect; should be 1219 D. Incorrect; should be 1319
Perform the indicated operations and simplify the result. Leave the answer in factored form.
A. 
B. 1
C. 
D. 12
Write the decimal point in the correct location. 0.003 × 26 = 78
A. 78. B. 0.0078 C. 0.78 D. 0.078
Solve the problem.A formula for calculating the distance, d, one can see from an airplane to the horizon on a clear day is 
where x is the altitude of the plane in feet and d is given in miles. How far can one see in a plane flying at 27,000 feet? Round your answer to the nearest tenth mile, if necessary.
A. 200.5 mi B. 1647 mi C. 16,470 mi D. 181.5 mi