Question

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Answer 1

The answer is: [C]: " 7.5 " .
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The value of: " f(3a) " = " 7.5 " .
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Step-by-step explanation:
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y = f(3) = the value of "y" when "x = 3" = 3.5 (based upon inspection of the graph provided in the "image attached).

f(3) = a = 3.5 ;
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The question asks: "What is the value of: " f(3a) " ?
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→ (3a) = (3)*(3.5) = 10.5 .

→ f(3a) = f(10.5) = y = the value of "y" when "x = 10.5" ;

= 7.5 (based on visual inspection of the graph in the "image attached") ;

→ which is: Answer choice: [C]: " 7.5 " .
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Answer 2

It is difficult to do find the exact answer from the photo.
f(3) looks like it hits the point 3, so a = 3.
Therefore 3a = 9
So f(3a) = f(9)
And f(9) looks like it hits the point 7ish. So my guess would be 7.5 (C)