1 and 3; 2 and 4 (sorry if I was too late to answer you)
Answer:
Step-by-step explanation:
Hello, please consider the following.

Thank you
Answer:
19.30
Step-by-step explanation:
if your finding the discounted price, you'd take 20% and turn it into .20 and then subtract 19.50 and .20
18 could round to 20
31 could round to 30
30 x 20 would be 600
Pretty sure that’s your best estimate,
600