The temperature, H, in degrees Celsius, of a fresh cup of coffee placed on the kitchen counter is given by H = f(t), where t is in minutes since the coffee was put on the counter. f(t) is negative, the units of of f'(7) are deg C/min. Suppose that f'(7) = 1.5 and f(7) = 67. At 5 minutes after the coffee was put on the counter, it's temperature is 67 deg C and will decrease by about how much in the next 90 seconds