Add or subtract as indicated.(7x2 - xy - y2) + (x2 + 9xy + 6y2)
A. 8x2 + 10xy + 7y2
B. 7x2 + 9xy + 6y2
C. 6x2 - 10xy - 7y2
D. 8x2 + 8xy + 5y2
Answer: D
Mathematics
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Calculate using the rules for order of operations.48 - (-4)2 + 21 ÷ (-3) ? 2Round to two decimal places, if necessary.
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Mathematics
Combined SAT scores in the United States could be approximated by
?
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in the years 1964 - 1986. Here t is the number of years since 1964, and T is the combined SAT score average for the United States. Find all points of inflection of the graph of T, and interpret the result.
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Enter your answers rounded to the nearest hundredth.
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Simplify.
A. z16
B. 
C. 2z
D. z4
Mathematics