Divide I from both sides then subtract r from both sides, too so in the end:
R= (E-r)/I
For T = 89.5 degrees C:
E(t) = 1100(90 - 89.5) + 520(90 - 89.5)^2= 1100(0.5) + 520(0.5)^2= 550 + 130= 680 m
For T = 90 degrees C:
E(t) = 1100(90 - 90) + 520(90 - 90)^2= 0 + 0= 0 m (meaning that boiling point is 90 degrees C at ground level)
I feel like this is a trick question
In the question it states "Jordan uses 0.08 of the solution for an experiment"
Which means that the answer is 0.08. Jordan uses 0.08 of the solution