The questions are in the photos below. I would like them all solved correctly.

Question 11 . . . . . . . . . . The temperature, T, In degrees CelSIUS, of an object put Into a 190 degree oven Is given as a function of time, I, In minutes, Not yet answered by: k Markedoutof T=a(1 t)+b. 2'00 (i) If the object starts at a temperature of 25 degrees Celsius, find the values of a and b. Hint: Consider t = 0 and the limit l' \"39 lim T(t). question t-boo b = [:1 (ii) If the temperature of the object is initially increasing at 4 degrees Celsius per minute, find the value of k. Question 8 Suppose the derivative of a function f (x) isf'(x) = (x - 2)(x + 6). Not yet answered (a) On which open interval is f(x) decreasing? Use interval notation, for example, oo(a,b) is the same as a