Asked by luckybee

telephone numbers for a certain city have exchanges of 584, 545, or 586. each of these exchanges is followed by four digits. how many different telephone numbers are possible for this city?

a. 3 * 4
b. 3 * 4 * 10
c. 3 * 10^4
d. 3 * 4^10
Answered by Damon
3 * 10*10*10*10
= 3*10^4