Question 5 When = 8, the rate at which do is increasing is - times the rate at Not yet answered which a is increasing. What is the value of k? Marked out of 1.00 Y Flag question Select one: O a. 3 O b. 4 O c. 6 O d. 8 O e. 12Question 8 The radius of a circle is increasing at a constant rate of 0.2 meters per Not yet answered second. What is the rate of increase in the area of the circle at the instant Marked out of 1.00 when the circumference of the circle is 207 meters? Flag question Select one: O a. 0.047 m'/ sec O b. 0.47 m/ sec O c. AT m' / sec O d. 20m m / sec O e. 100m m / sec