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Tysm if you help out with the answer and show work! I’m really confused so I really appreciate you!

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?

Bradley hikes 12 miles in 3 hours. in relation to bradley’s hike, which statement describes the expression

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10