Solve the problem.The inequality 
? 11 describes the range of monthly average temperatures T in degrees Fahrenheit at a City X. (i) Solve the inequality. (ii) If the high and low monthly average temperatures satisfy equality, interpret the inequality.
A. 39 ? T; The monthly averages are always greater than or equal to 
B. T ? 70; The monthly averages are always less than or equal to 
C. 48 ? T ? 70; The monthly averages are always within 
D. 39 ? T ? 79; The monthly averages are always within 
Answer: C
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Factor by grouping.3x2 + 7xy + 21x + 49y
A. (x - 7)(3x - 7y) B. (3x + 7y)(3x + 7) C. (x + 7)(3x + 7y) D. (3x + 7)(7x + 3y)
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