The "principal" is the amount invested: $13,000.
Answer:

Step-by-step explanation:
Given
Lines x and y
Transversal b

Required
Find 
From the attachment,
and
are vertically opposite.
This means that

Similarly
and
are supplementary angles
So:

Make
the subject



The relationship between
and
is that they are supplementary angles because:

34/2380
we can divide by 2 on top and bottom
17/1190
17 is prime so that is simplest form
nevermind
1/70
if you wanted decimal, use yor calculator and get 0.01428571428571428571428571428571
Answer:
400$
Step-by-step explanation:
100$ is 25% of 400