For the transformation t, what is t-1?

t : (x, y) (x + 4, y + 3)
t-1: (x, y)

a.) (x - 4, y - 3)
b.) (-4x, -3y)
c.) (x + 3, y + 2)

You’re ordering more thread for blue jeans co. you usually purchase from ted’s threads, which sells 12 thread spools for $27. you recently received a notice from wade's wares that says you can buy thread from them for $2.30 each for the first 2 dozen and $2 a spool thereafter. you need to order 5 dozen spools. what percentage can you save by going with wade’s wares?