Question 7 Let f be a differentiable function such that f(4) = 7 and f'(4) = . The graph of ƒ is concave up on the interval (3, 5). Which of the following is true about the approximation for f(3.5) found using the line tangent to the graph of ƒ at a = 4? A f(3.5) 6.9 and this approximation is an overestimate of the value of f (3.5). B ƒ (3.5) 6.9 and this approximation is an underestimate of the value of ƒ (3.5). C D f(3.5) 7.1 and this approximation is an overestimate of the value of ƒ (3.5). f (3.5) 7.1 and this approximation is an underestimate of the value of ƒ (3.5).