Solve for x. Assume that a and b represent positive real numbers.x2 - a2 - 81 = 0
A. {
, - 
}
B. {a2 + 81, a2 - 81}
C. {
, - 
}
D. {
, - 
}
Answer: C
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Provide an appropriate response.Is the following matrix game strictly determined? Answer Yes or No 
A. Yes B. No
Solve the problem. Round your answer to the nearest tenth, when appropriate. Use the formula 
, as needed.Find [H3O+] if the pH = 11.
A. 1.0 × 1011 B. 1.0 × 10-11 C. 3.0 × 10-11 D. 2.0 × 1011
Simplify the expression. 
A. 
B. 
C. 
D. 
Find the tax. Use $3700 for each personal exemption; a standard deduction of $5800 for single people, $11,600 for married people filing jointly, $5800 for married people filing separately, and $8500 for head of a household; and the tax rate schedule. 
Megan Cortez had an adjusted gross income of $51,453 last year. She had deductions of $886 for state income tax, $570 for property tax, $3809 in mortgage interest, and $605 in contributions. Cortez claims one exemption and files as a single person.
A. $7520.75 B. $6595.75 C. $8063.25 D. $8988.25