I don't know the second on but the first is pint
I think your answer is c but I'm not sure
I think a is (8,-8)
B) (0,8)
Answer:
you need 100ml of 5X TAE and 400ml of water.
Step-by-step explanation:
You need to use a rule of three:

where:

and

Therefore:


Then just rest the TAE volume to the final Volume and you get the amount of water that you need to reduce the concentration.