3:1 , 4*3=12, 5*1=5
Ratio is 3:1
Answer:
12:15 is NOT proportional to 3:4
Step-by-step explanation:
7.5:10 is proportional to 3:4 because 3×2.5=7.5, and 4×2.5=10.
39:52 is proportional to 3:4 because 3×13=39, and 4×13=52
45:60 is proportional to 3:4 because 3x15=45, and 4×15=60
12:15 is not proportional to 3:4 because while you can multiply 3x4=12, you can not multiply 4×4 to get 15, you get 16 instead.
C.
Observe that the roots of polynomial are 
We have a polynomial in a factored form,
If you substitute x for any of the product will always equal to zero that is these numbers are roots of polynomial.
Hope this helps :)
Answer:
X=9
Step-by-step explanation:
4x+8=40
4x=40-8
4x=32
X=9
