Which of the following statements best describes the effect of replacing the graph of y = f(x) with the graph of y = f(x) − 11? The graph of y = f(x) will shift up 11 units.
The graph of y = f(x) will shift right 11 units.
The graph of y = f(x) will shift left 11 units.
The graph of y = f(x) will shift down 11 units.

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  The graph of y = f(x) will shift down 11 units.

Step-by-step explanation:

The y-coordinate of a point on the graph is the distance above the x-axis. When 11 is subtracted from the y-coordinate, the distance above the x-axis is decreased by 11. That is, the point will shift down 11 units.

answer: 60

step-by-step explanation:

1/2a + (2/3×30)   = 50

1/2a + 20 = 50

1/2a = 30

a = 60