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(1 point) Let x+1 x2+3 f(x) = Compute and simplify each of the following values. If one is not defined, type Undefined . a) f(3a 6) = / (1 point) List all real values of x such that f(x) = 0. If there are no such real x, type DNE in the answer blank. If there is more that one real x, give a comma separated list (i.e.: 1,2). f(x) = -19+ 7 x + 10 X =(2 points) A model for the rate of change in infected individuals, I , in a population of 150 total individuals, was found to be R =f(I) = 0.0005 -1 - (150 I) (a) Compute the value of f(68) = (b) Which is larger, f(20) or f(138)? Write the larger value in the following box (c) How many infected individuals are there when the rate of change in infected is 2 individuals per day? (d) Does the model ever predict a rate of growth in infected of 3 individuals per day? Write "yes" or \"no" in the following box (1 point) Suppose y is directly proportional to x. and y = 9 when x = 4. (a) Find the constant of proportionality and a formula for y. y = help (formulas) (b) Use your formula to find x when y = 19. x = help (numbers) (1 point) If y is inversely proportional to x, and y = 3 when x = 15, then find the value of y when x = 24. Answer: y = when x = 24