Answer:
28 non-blue marbles.
Step-by-step explanation:
Initial probability of choosing a blue marble = 4/12
Let the number of non-blue marbles to be added be x.

(cross multiply)

-2(x-4) is the answer to your question
Answer: 3*2=6
Step-by-step explanation: Turn the 2 into a 3 then see if it make sense
Answer:
y=-3x^2+10 is a quadratic function, so Yes it is a function.