Step-by-step explanation:
I ᴛʜɪɴᴋ ᴛʜɪs ǫᴜᴇsᴛɪᴏɴ ɪs ᴡʀᴏɴɢ. ᴄʜᴇᴄᴋ ʏᴏᴜʀ ǫᴜᴇsᴛɪᴏɴ ᴏɴᴄᴇ ᴘʟᴇᴀsᴇ.
Answer:
is the function of the least degree has the real coefficients and the leading coefficients of 1 and with the zeros -1, 5, and 2.
Step-by-step explanation:
Given the function

As the highest power of the x-variable is 3 with the leading coefficients of 1.
- So, it is clear that the polynomial function of the least degree has the real coefficients and the leading coefficients of 1.
solving to get the zeros

∵ 
as

so
Using the zero factor principle
if 


Therefore, the zeros of the function are:

is the function of the least degree has the real coefficients and the leading coefficients of 1 and with the zeros -1, 5, and 2.
Therefore, the last option is true.
Do you mean the length of the cable?
If so, it would be 13.42ft.
Take the cable as the hypotenuse, and add the squares of 12 and 6 then squareroot them.