October has 31 days.
31 days x 24 hours in a day x 60 minutes in one hour
= 44,640 minutes.
1:60 because there is 60 seconds in 1 minute, so you'd have 70/x=1/60 and then you would cross multiply
18 is the value hope it helps
ANSWER

EXPLANATION
The given expression is

To find an expression for d in terms of a, b, and c, means we want to make d the subject of the relation.
This means that, we need to isolate d on one side of the equation while all other terms are on the other side.
We subtract from both sides of the equation to obtain,

We now divide through by -1, to get,

Or

The topic is change of subject