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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Solve the problem.Use the formula E = 2.575
to compute the sample size that a statistician requires to estimate a population proportion with 99% confidence for a margin of error E = 2.5%.
A. 10,609 B. 7957 C. 1412 D. 2652
Solve the problem.If f(x) = 9x3 + 5x2 - x + C and f(-2) = 1, what is the value of C?
A. C = 51 B. C = -53 C. C = -93 D. C = -13
Using the illustration, find the measure of each acute angle for the right triangle below. Answers are rounded using the appropriate rule for significant digits.b = 20.72 m, c = 46.92 m
A. A = 17.85 o, B = 72.15 o B. A = 31.21 o, B = 58.79 o C. A = 23.71 o, B = 66.29 o D. A = 63.79 o, B = 26.21 o E. A = 36.62 o, B = 53.38 o
Suppose that the marginal propensity to save is 
(in billions of dollars) and that consumption is $9 billion when disposable income is 0. Find the national consumption function C. Round numbers in our answer to two decimal places when appropriate. If it's necessary, round your calculations to two decimal places.
?
A. 
B. 
C. 
D. 
E. 