Solve.
+ 
= 
A. -6
B. 
C. 3
D. 6
Answer: D
Mathematics
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Solve the problem by using a nonlinear system.The sum of the squares of the digits of a positive two-digit number is 85, and the tens digit is 1 less than the units digit. Find the number.
A. 56 B. 67 C. 65 D. 76
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Factor out the greatest common factor.7y + 21
A. 7y B. 21 C. 7(y + 3) D. no common factor (except 1)
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Choose the graph of the equation.y2- x2- z2= 1
A. 
B. 
C. 
D. 
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Add or subtract, if possible. Assume that all variables represent non-negative values and be sure to simplify your answer.
- 
A. -25
B. -5
C. 9
D. -5
Mathematics