Question 20 (1 point) If the radius r of a spreading circular rash is increasing at a rate of 0.7 cm/day, then the area A =ar of the rash increases at a rate of ......... cm2/day when the radius of the rash is 3 cm. Note: r is a function of t (time) ( a) 2.8n O b) 4.2 n O c) 5. 6 TT O d) 7n O e) None of the above Previous Page Next Page Page 4 of 4