4. If x + sin y = lny, then dy =? (+ dx dy cosy by y by f. y- y cos y b. y+cos y -1 y 1-y C. d. y y e. y cos y y cos y -1 1- y cos y 5*. The rate at which ice is melting in a pond is given by d = 1+2', where V is the volume of ice in cubic dt feet, and t is the time in minutes. What amount of ice has melted in the first 5 minutes? a. 14.49 ft b. 14.451 ft c. 14.53 ft d. 14.55 ft e. 14.57 ft #5 FRQ 2003 AB #6 Form B == Let f be the function satisfying f'(x)=xf(x) for all real numbers x, where f(3) = 25. a. Find "(3). b. Write an expression for y = f(x) by solving the differential equation dy = xy with the initial dx condition f(3)=25.