Answer:
8.2
Step-by-step explanation:
OK, here is a calculus formula for linear approximation:
f(x) = f(a)+f'(a)(x - a)
a is your approximation, and here we use the value 6, so
f(x) = f(6)+f'(6)(6.2 - 6)
f(x) = 7 + 6(.2) = 8.2
By this formula, your answer is 8.2