Abookstore had 60 copies of a magazine. yesterday, it sold 2/3 of them. today, it sold 1/4 of what remained. how many copies does the bookstore have left?

True or false? many triangular shapes can be circumscribed about a given circle

Use the inverse of the function y=x^2-18x to find the unknown value [tex]y = \sqrt{bx + c \: + d} [/tex]

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?