Add or subtract. Simplify the answer.
- 
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Multiply. Simplify by combining like terms.(m2 + 0.4n)(m2 - 0.4n)
A. m4 - 0.16m - 0.16n2 B. m4 - 0.16n2 C. 2m4- 0.8n2 D. m4 + 0.16n2
Mathematics
Solve. Assume the exercise describes a linear relationship.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 783. Find a linear equation which fits this data, and which relates score to review time. Use this equation to predict an average score for persons taking a 44-hour review course. Round your answer to the nearest tenth.
A. 669.8 B. 677.1 C. 681.3 D. 691.1
Mathematics
Simplify the expression.
A. z12 - z11
B. z23
C. z
D. 
Mathematics
Perform the indicated operation.
- 
A. - 
B. 
C. -7
D. - 
Mathematics