Answer:
82
Step-by-step explanation:
10z^2 - 2z - 2 =
10(3)^2 - 2(3) - 2 =
10(9) - 2(3) - 2 =
90 - 6 - 2 = 82
3(b+7)=6
Sum means adding, so 3 is multiplied by (b+7)
idk
18
54/9 + 12
6 + 12
= 18
31.41
