Find the cross-product and determine whether the proportion is true or false.
= 
A. 84 = 84; true
B. 36 = 36; true
C. 
? 672; false
D. 288 ? 49; false
Answer: A
Mathematics
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A. 
B. 6
C. -729
D. 9
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A. 4.32 × 104 B. 4.32 × 105 C. 4.32 × 106 D. 4.32 × 103
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Write the series in summation notation. Use the index i and let i begin at 1 in each summation.3 + 9 + 15 + 21 + 27
A. 
B. 
C. 
D. 
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Solve the logarithmic equation.log x = 5
A. 5 B. 50 C. 100,000 D. 0.5
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