Hello,
f(n+1)=f(n)-2
f(1)=10
f(2)=8
f(3)=6
...
-3.8 - 0.5m <== ur expression
the variable (m) represents number of minutes
Your answer is

because the numbers raised to negative powers must be flipped over the divisor to become positive. Then, when multiplying 2 and z, you add their exponents.
Step-by-step explanation:
sec X = WX/XY = 37/12 = 3 1/12
or 3.083
I think you add the numbers together, and then divide by three