<u>Answer:</u> The value of 15th term is 0
<u>Step-by-step explanation:</u>
The nth-terms of an AP is written as
where,
a = first term
n = number of term
d = common difference
5th tem will be = 
11th tem will be = 
15th tem will be = 
The given ratio between 5th and 11th term is 5 : 2
Taking the ratios:

Hence, the value of 15th term is 0
so 3 tenths is 0.3 and 5 tenths is 0.5 but if you need to add them you would get 0.8
Answer:
Step-by-step explanation:
1. Equation: x + 50 = 180 degrees
Solution: x = 180 - 50
x = 130 degrees
2. Equation: x + 45 = 90 degrees
Solution: x = 90 - 45
x = 45 degrees
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.