Question list K Determine e" by first finding a fundamental matrix X(t) for x' = Ax and then using the formula Al = X(t)X(0)-1. 5 A = O Question 1 49 5 O Question 2 First, find X(t). Choose the correct answer below. - 21 12t O Question 3 O A. X(1) = 7e- 21 70121 O Question 4 (1 - the - 21 121 O B. X(t) = (7 +1)e-21 7121 - e" " cos 12t e121 sin 12t O C. X(t) = 7e" " cos 12t 7el21 sin 12t - 2t _ 12t O D. X(1) = 7e- 21 7121 Next, find At At =0