Identify which of these types of sampling is used: simple random, stratified, systematic, or convenience.A tax auditor selects every 1000th income tax return that is received.
A. Simple random
B. Convenience
C. Systematic
D. Stratified
Answer: C
Mathematics
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Find the average value of the function f over the given region.f(x, y) = 5x + 9y; R = {(x, y): 0 ? x ? 8, 0 ? y ? 7}
A. 
B. 20
C. 
D. 
Mathematics
Solve the equation.
- 3 = -2
A. 22 B. -20 C. -22 D. 20
Mathematics
Write the expression in the standard form a + bi.2i(3 - 4i)
A. 6i + 8i2 B. 6i - 8i2 C. 8+ 6i D. 6i- 8
Mathematics
Perform the indicated operations.(6x6 + 7x3 + 7x) + (7x6 - 3x3 + 9x)
A. 4x6 + 16x3 + 13x B. 33x10 C. 13x6 + 4x3 + 16x D. 14x6 + 3x3 + 16x
Mathematics