Answer:
-1/7
Step-by-step explanation:
Divide the first expression by the second expression.
For the numeric part, you'll have to find the GCD of 15 and 25, which is 5. So, we can factor a 5 and we have

As for the literal part, you can factor
because it's the power of s with the smallest denominator. So, we have

would it be 90 ? because of the big angle
13 is prime because there is only 1 factor 1 and 13.