Chapter 8.1, Problem 39E

Heart Disease In a certain country, the number of deaths due to heart disease decreased from 235 in one year to 221 in the next year. What percentage decrease in deaths due to heart disease does this represent?

The motor in the vehicle is used to remove snow and mud. The power (energy per unit time) supplied in each case for the mixed terrain is shown in the graph below. Circle) the section that has the highest power consumption. Also, find the lowest power consumption. Write your answer in the boxes given below. The section having highest power consumption is: 6000 (6,6000) A B. (2,4000) (4,4500) B. 4000 2000 ft-lb/h Least power consumed %3D 0 (0.0) 4 Time (in h) Wate Ice Energy (in ft-lb)

Maggie entered a speed typing contest. In the graph below, x represents time in seconds, and y represents the number of words typed by Maggie. What is Maggie's unit rate for words typed per 12 10 second? A 2 words typed per second B 4 words typed per second C 1 word typed per second 2 D 0.5 word typed per second 0 246 8 10 12 4 16 18 20 22 Time (seconds) Words Typed 6.