Fiona divided 3x2+5x-3 by 3x+2. The expression a/3x+2 represents the remainder over the divisor. x+1+a/3x+2

What is the value of a?

-5
-1
1
5

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint