7. [0/5 Points] DETAILS PREVIOUS ANSWERS MY NOTES Allen and coworkers collected the data found in the following table relating the intrinsic rate y of increase of the citrus rust mite to the temperature T in degrees Celsius. 7 14 17 19 21 23 25 27 29 31 33 y-0.05 -0.02 0.04 0.08 0. 10 0.09 0. 12 0.12 -0.08 -0.24 A. Use cubic regression to find the best-fitting cubic to the data. y (t ) = -2.6439x + 0.015757 - 0.28887 + 1.6361 X B. Find the rate of change of the cubic regression function. y' ( t ) = C. Find second derivative of the cubic regression function. y " ( t ) = E. Find the interval where the function if concave up and concave down. concave up: O (-00, 19.75) O (-00, 19.75] [19.75, 00) O (19.75, Do) O no interval concave down: O (-00, 19.75) O (-00, 19.75] O (19.75, Do) [19.75, 00) O no interval # Show My Work (Optional)