Anumber written in scientific notation is multiplied by 100. explain what happens to the exponents of 10

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

100 points? me its important ‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️‼️

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis. y = 7ex, y = 7e^-x, x = 1; about the y-axis