Virginia bought 18 packs of envelopes for $2 each and 15 packs of you cards for $4 each . if she gives the cashier $100, how much change should she receive?

$4 Change

Step-by-step explanation:

18 x 2 = 36

15 x 4 = 60

100 - 36 - 60 = 4

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2