Find the value of the expression using the given values.
?x = 8, y = 9
A. -15
B. -111
C. 111
D. 15
Answer: D
Mathematics
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Solve the problem.The world population of a certain species is evaluated at 2.3 × 106. By some projections, this population will be 6 times more important in 30 years. Express the population at that time in scientific notation.
A. 138 × 106 B. 13.8 × 107 C. 1.38 × 109 D. 1.38 × 107
Mathematics
Solve the problem.How many spanning trees does the following network have?
A. 6 B. 7 C. 4 D. 5 E. none of these
Mathematics
Use the graph of f to sketch a graph of the inverse of f using a dashed curve.
A. 
B. 
C. 
D. 
Mathematics
Add. Write a mixed numeral for the answer.4
+ 1
A. 5
B. 5
C. 6
D. 5
Mathematics