Decide whether the matrices are inverses of each other. (Check to see if their product is the identity matrix I.)
and 
A. Yes
B. No
Answer: B
Mathematics
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Express the following in interval notation.{x|x < -4 or x > -3}
A. (-4, -3) B. (-?, -4] ? [-3, ?) C. (-?, -4) ? (-3, ?) D. [-4, -3]
Mathematics
Find the difference.-30 - (-30)
A. 90 B. 60 C. 0 D. -60
Mathematics
Subtract.31 - 13.61
A. 17.29 B. 17.39 C. 17.38 D. 17.49
Mathematics
Solve the system of equations by the addition method.
A. (5, 25)
B. no solution
C. 
D. (25, 5)
Mathematics