7) The width of a rectangle is increasing at a rate of 3 cm/sec, and its length is increasing at a rate of 4 cm/sec. At what rate is the area of the rectangle increasing when its width is 8 cm and its length is 10 cm? 8) A radio transmitter is located 3 miles from a straight section of interstate highway. A truck is traveling away from the transmitter along the highway at a speed of 65 miles per hour. How fast is the distance between the truck and the transmitter increasing when they are 5 miles apart