Suppose you have 3 pieces of string measuring 6 inches, 9 inches, and 12 inches. how many unique triangles can you form with these pieces of string? a. 0 b. 1 c. 2 d. infinitely many

Let
x=12 in > the longest of the three sides
y=6 in
z= 9 in
if x< (y+z) > one unique triangle can be made
if x> (y+z) > no triangle can be made
This is a Triangle Inequality Theorem
therefore
x=12
(y+z)=15
12<15 >one unique triangle can be made

the answer is the option B. 1

The discount is 8.70 . you dont tell us the percent of tax added so there is no way to find out, unless i'm not seeing anything. without tax its 37.70