What is the value of the expression expression 9 – m. If m = –3, n = 8, and p = –1?

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?

If square root x = -7, then x= -49 true or false

Can you me find the missing length. i attached an image.