$42.
13/2 = 6.5, 25/4 = 6.25, 42/7 = 6.
Answer: The required value is

Step-by-step explanation: The given functions are:

We are given to find the value of 
We know that, if s(x) and t(x) are any two functions of a variable x, then we have

Therefore, we have

Thus, the required value is

The reciprocal means you're just flipping the fraction around,, so it would be 9/10
Answer:
Answer- 1696.5 cubic inches
Step-by-step explanation:
r = d/2
r = 12/2 = 6 inches
Volume V = πhr^2
V = 3.14×15×6×6
V = 1695.6