Answer:
y = 20
Step-by-step explanation:

<h3>i) move 9 to the right-hand side and change its sign</h3>

<h3>ii) calculate the difference</h3>

<h3>iii) change the signs on both sides of the equation</h3>

<h3>iv) square both sides of the equation</h3>



<h3>v) move -4 to the right-hand side and change its sign</h3>

<h3>vi) add the numbers</h3>

Answer:
for number 8 it B and for number 9 its D
Step-by-step explanation:
Divide 120000 by 1000 to get your answer since there are 1000 mL in a liter......the answer is 120 liters