All I know or all I understood was both 7 and 8 aren’t functions. Hope this helped
The scientific notation:


Used:

Answer: (4 × 10⁸)² = 1.6 × 10¹⁷
Answer:
To use the elimination method one coefficient of either x or y must be the same number with opposite signs, so the ordered pair is (-10, -8)
Step-by-step explanation:
2(-x+y=2) Make one of the coefficients equal, with opposite signs.
2x-3y=4 Combine equations.
-y=8 Solve, y=-8
Then find x, -x-8=2
-x=10, so x= -10
(-10, -8) is your answer.
Looks like D to me but i could be wrong. Did you try image reversing?