If you zoomed in i could've helped more. Bummer...
Answer:
In elementary algebra, a trinomial is a polynomial consisting of three terms or monomials.
Y=21/7
Explanation
7(y/7)=7(3/17)
y=7(3/17)
Multiple
y=21/7
1- the answer is b and d 2- the answer is a and b 3- the answer is b