Matrix A is given. Find appropriate identity matrices Im and In such that ImA = A and AIn = A.A = 
A. Im = 
, In = 
B. Im = 
,
In = 
C. Im = 
, In = 
D. Im = 
, In = 
Answer: C
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Find the average value of 
over the given region.
+ z2 over the rectangular solid in the first octant bounded by the coordinate planes and the planes 
, 
, 
A. 31
B. 
C. 
D. 
Express the number in scientific notation.870,000
A. 8.7 × 105 B. 8.7 × 104 C. 8.7 × 10-4 D. 8.7 × 10-5
Determine the row operation that was used on the first matrix to obtain the second matrix.
, 
What will be an ideal response?
Solve the problem.Michael's bank contains only nickels, dimes, and quarters. There are 63 coins in all, valued at $5.50. The number of nickels is 5 short of being three times the sum of the number of dimes and quarters together. How many dimes are in the bank?
A. 46 B. 10 C. 7 D. 12