Final answer:
Jayden receives $56 from the $84 reward, as his share is 4 parts of the 4:2 ratio with Ethan.
Step-by-step explanation:
To find out how much Jayden receives, we need to divide the total reward of $84 in the ratio of 4:2. The ratio 4:2 means that for every 4 parts received by Jayden, Ethan receives 2 parts. The total number of parts in the ratio is 4 + 2 = 6. To find Jayden's share, we divide the total reward by the number of parts in the ratio, and then multiply by the number of parts Jayden receives: Jayden's share = ($84 / 6) * 4 = $56.