Which set or sets does the number 15 belong to? A. whole numbers only
B. rational numbers only
C. integers and rational numbers only
D. whole numbers, integers, and rational numbers

Asap! i'm not good math and i'm lost.

Consider the input and output values for f(x) = 2x - 3 and g(x) = 2x + 7. what is a reasonable explanation for different rules with different input values producing the same sequence?

Usan threw a softball 42 yards on her first try and 5112 yards on her second try. how much farther did she throw the softball on her second try than her first? express your answer in feet and inches. 9 ft 12 in. 28 ft 12 in. 28 ft 6 in.