Cuanto es (10²-80) ayudaaa!! ​

Which answer is the solution set to the inequality |x|< 9? a. x< -9 or x> 9 b. x> -9 and x< 9 c. x> -9 or x< 9 d. x< 9 and x< 9

Solve 2x − 1 = 11 for x using the change of base formula log base b of y equals log y over log b.

4percent of a number is what fraction of that number? ? i really need asap