Solve the problem.Mark can remember only the first 5 digits of his friend's phone number. He also knows that the number has 7 digits and that the last digit is not a 0. If Mark were to dial all of the possible numbers and if it takes him 17 seconds to try each one, how long would it take to try every possibility?
A. 25.5 min
B. 2.8 min
C. 28.3 min
D. 5.7 min
Answer: A
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Find the particular solution to the given differential equation that satisfies the given conditions.
- 9 
+ 14y = 12 - ex; 
= 
and y = 
when x = 0
A. y = - 
e2x + 
e7x - 
- 
ex
B. y = - 
e2x + 
e7x + 
+ 
ex
C. y = - 
e2x + 
e7x + 
- 
ex
D. y = - 
e2x - 
e7x + 
- 
ex
Solve the problem.The Internal Revenue Service randomly tags 5% of all tax returns for a possible audit. If 200 Middletown residents have had their tax returns tagged, approximately how many residents live in Middletown?
A. 10 B. 40,000 C. 4000 D. 1000 E. none of these
Write the product using exponential notation.5 ? 5 ? 8 ? 8 ? 8 ? 8
A. 52 ? 84 B. 5 ? 86 C. 406 D. 25 ? 48
Perform row operations on the augmented matrix as far as necessary to determine whether the system is independent, dependent, or inconsistent. -x - y - z = 2 x + y + z = -8 x + y - z = -6
A. Dependent B. Independent C. Inconsistent