Answer:
r1 is given by the formula an=a1r.n-1
Step-by-step explanation:
To graph a line, all you need is two points, we already know the line goes through (3, -4), and we know its slope is -2 or -2/1, so simply "run it by 1 unit" and "rise it by -2 units", to get a second point,
that's the second point, now just run the line through those two.
Well for each concentrate, you need ten times the amount, so if it was 1ml of concentrate you would add 10ml of water. Since it is 300ml of concentrate, you need to add (300 x 10) ml of water, or 3,000 ml.
B. Hope I helped sorry if I got it wrong