Solve photo question. mathematics .

How can we find the measure of an exterior angle if we know the measurement of an interior angle

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?

What are the domain and range of the function f(x)=2^x+1