courtney has 12 fewer stickers than tina. how many stickers does courtney have in terms of x?

bob has 4 times as many stickers as tina. how many stickers does bob have in terms of x?

katie has 7 more stickers than tina. how many stickers does katie have in terms of x?

diane has 2/3 as many stickers as tina. how many stickers does katie have in terms of x?

options:
x - 12
4x
x + 7
12 - x
x - 2/3
4 + x
7x