A receipt is . A.
A book for recording transactions
B.
A record of a product that hasn’t been paid for
C.
A record of a transaction that already happened
D.
A method of issuing invoices

A receipt is a record of a transaction that apready happened.

if x decreases by 4 then y increases by 10

step-by-step explanation:

3, 12, 48, 384, 1536, 6144, 24576, 98304

step-by-step explanation:

just keep timing it by 4.