Answer:
744
Step-by-step explanation:
12a^2 + 4b
Plug-in:
12(8)^2 + 4(-6)
12(64) + 4(-6)
768 - 24
20 coins
697/17 = 41
820/41 = 20 coins
1 5/6
14a+28=168
14a=140
a=10
hope it helps