9/10 is the answer. 7/8 is 70/80 and 9/10 is 72/80
Answer:

Step-by-step explanation:
Initially the graph f (x) is shifted horizontally to the right.
When the graph shifts to right the function then becomes
f(x)→f(x-b)
Where b is the units by which it is shifted towards right .
So, in the figure we can see that it is shifted 2 units to the right .
So, f(x)→f(x-2)
Since f(x) is 
So, f(x-2) = 
Now the new obtained graph is again shifted vertically upward
When the graphs shifts upward f(x) →f(x)+b
where b is the units by which it is shifted upward
So, our obtained f(x-2) when shifted upward by 4 units so using the above given transformation of upward shift i.e. f(x) →f(x)+b
So, Our new graph h(x) = f(x-2)+4
⇒ 
Answer:
60ml of the 50% alcohol solution and 20ml of the 6% alcohol solution
Step-by-step explanation:
We can build a system of equation for solve this problem
x = first solution
y = second solution
x + y = 80
0.5x + 0.06y = 80 * 0.39
x + y = 80
0.5x + 0.06y = 31.2
x = 80 -y
0.5(80-y) + 0.06y = 31.2
40 - 0.5y + 0.06y = 31.2
-0.44y = -8.8
y = 20
x = 80 - 20 = 60