Answer:
36 ounces
Step-by-step explanation:
Let q represent the quantity of 30% solution required. The total amount of alcohol in the mix is ...
30%·q + 35%·9 = 31%·(q +9)
30q + 315 = 31q +279 . . . . multiply by 100 and eliminate parentheses
36 = q . . . . . add -(279+30q) to both sides
36 ounces of 30% alcohol must be mixed to make the 31% solution.
A
yes, no, no
For odd functions : −f(x) = f(−x) for all x
For even functions :f(x) = f(−x) for all x
1) -f(x)= -2x^3 -2x
f(-x) = -2x^3-2x
yes
2 ) f(-x) = 5x^3 -4 ≠ f(x)
no
3 ) f(-x) = -4x -4 ≠ f(x)
Answer: 3rd option (-2, -3)
