Answer:
Gold is LESS expensive than platinym because SLOPE of graph is LESS
SLOPE gives UNIT DOLLARS PER OUNCE.
Step-by-step explanation:
sorry im late
( Don't cheat, use your own words) He is correct. 9 x 8 = 72
He can check his math by doing 72 ÷ 9 = 8 and 72 ÷ 8 = 9