You have the following function f(x):
f(x) = 4.93/x - 3.35
To calculate f(2.9) you replace x bu 2.9 in the previous function, and proceed with the calculations:
f(2.9) = 4.93/2.29 - 3.35
f(2.9) = 2.15 - 3.35 = -1.2
Then, the answer is f(2.9) = -1.2
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