Answer:
1.2981614e+19
Step-by-step explanation:
you can always use a calculator for powers.
C is the answer
you can also see
6 is the answer
sup
a=-30
1. x = 7/2 + 5y/2
2. x = 3/4 - 5y/8
3. x = 1/8 = 5y/8
Thats all i can do. Its too confusing