It’s b because it’s -85 f so the planet is colder
If the two lengths of the triangle are 2x+6 and x-1
(2x+5)+(x-1)=3x+4
(10x+2)-(3x+4)= 7x-2
C-3/5=4
c-3/5*5=4*5 (We do this to get ride 5 so we can simplify to just 3)
c-3=20
+3 +3
c=17
So, the rate per 7 minutes is 7:196
To find the unit rate (how many spins per minute) we need to divide the 196 by 7.
196/7 = 28
The unit rate is 1:28
At this rate, the unicycle makes 420 revolutions per 15 minutes. We find this by 28 * 15 = 420.