In 1990, a person is 15 years old. in 1995, that same is ten years old. how can this be? (only for geniuses). if anyone can answer this question properly, you will get brainliest + 40 points.

Which of the following transformations does not preserve congruence? * 5 points a. (x, y) → (y − 3, x − 3) b. (x, y) → (x + 5, y − 1) c. (x, y) → (y + 9, −x + 2) d. (x, y) → (3x + 1, 3y − 2)

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^4

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?