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: B
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Evaluate the integral.
A. 
- 7 ln
B. - 
ln
+ C
C. - 
ln
+ C
D. - 
+ C
Decide whether or not the given equation is an identity.cos x + cos x tan2 x = sec x
A. Yes B. No
Solve the problem.There are 3 balls in a hat; one with the number 1 on it, one with the number 2 on it, and one with the number 5 on it. You pick a ball from the hat at random and then you roll a die. Using a tree diagram , obtain the sample space for the experiment. Then, find the probability that the number on the ball is the same as the number on the die.
A. 
B. 
C. 
D. 
Use percents, percent equations, and/or percent proportions to solve the application.Students enrolled in a prealgebra class can withdraw within the first two weeks without receiving a grade. If there were 30 students registered for class on the first day and 22 remaining at the end of the second week, what was the percent decrease in students for the first two weeks? Round to the nearest tenth of a percent, if necessary.
A. 63.6% B. 26.7% C. 73.3% D. 36.4%