The telephone extensions at a company use 4 digits. a. How many extensions are possible if there are no restrictions?
b. How many extensions are possible if the first digit cannot be 0 or 9?
c. How many extensions are possible if the first digit can only be 1?
Pls help with c

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .

If a suspect is in possession of 20 grams of cocaine how many ounces does he possess what will the charge be

Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?