Answer:
13
Explanation:
Since Seth pays $0.50 for each check he writes, he would write (let x be how many checks Seth wrote) "x" checks for $6.50. That means;
1 = 0.50
x = 6.50
Now let us set up a fraction:

Step 1: Cross multiply


Step 2: Divide both sides by


Simplify

Therefore, Seth will write 13 checks for $6.50