7. A particle moves along the x-axis so that at any time t, t 2 0, its acceleration is a(t) = -4 sin(2/). If the velocity of the particle at t = 0 is v(0) = 7 and its position at t = 0 is x(0) = 0, then its position at time t is x(t) = (A) sin(2t) + 5t (B) sin(2t) + 7t (C) sin(2t) + 9t (D) 16 sin(2t) + 7t18. Let f be the function defined by f(x) = 3/x. What is the approximation for f (10) found by using the line tangent to the graph of f at the point (8, 2) ? 11 25 13 (A) 6 (B) 12 (C) 6 (D)