In the first 4 and half days of the wildfire season in Alaska 90 acres had been

In the first 4 and half days of the wildfire season

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In the first 4 and half days of the wildfire season in Alaska, 90 acres had been burned. By the 90th day of the wildfire season in Alaska, 4.5 million acres of land had been burned, or during the first 3 months of the wildfire season, 4.5 million acres were burned. Question 2 1 / 1 pts Find the equation for the line with slope m=23 passing through the point (1,-1). Correct! Subscribe to view the full document.

Question 3 1 / 1 pts Which of the following tables give a linear relationship between t and w? I. t 1 3 5 7 w 2 1 0 -1 II. t 1 2 3 4 w 2 3 5 8 III. t 1 2 3 4 w 1 4 9 16 Correct! I. only. None are linear. All are linear. II. and III. only. III. only. In I. the relationship is linear. In II. and III. the relationships are not linear. In both cases, the rate of change of is increasing. Question 4 0 / 1 pts Let s(t)=4−t2. Calculate s(a+1). You Answered Correct Answer Plug in and simplify. Question 5 1 / 1 pts Calculate the average rate of change of f(x)=x2+1 on the interval [1,4]. Correct! Subscribe to view the full document.

The average rate of change of over the interval is Question 6 1 / 1 pts Find the relative change of the quantity T if T changes from 0.7 to 0.05. Reminder: calculator can be used on quizzes if needed. approx 1.30 approx -0.29 Correct! approx -0.93 approx 0.48 approx -13.0 The relative change in is , where is the new value of and is the previous value of . We have Question 7 0 / 1 pts The table below shows the wind chill temperature, T, in degrees Fahrenheit when the ambient temperature is 20F, as a function of the wind speed in miles per hour (mph). Calculate the average rate of change in the wind chill temperature (in degrees F per mph) when the wind speed changes from 0 to 20 mph. The average rate of change here gives us the change in the windchill temperature for a 1 mph increase in windspeed (on average). wind (mph) 0 5 10 15 20 2 5 30 35 windchill temp (F) 20 13 9 6 4 3 1 0 You Answered -2.5 F per mph -0.2 F per mph 4 F per mph -1.4 F per mph Correct Answer -0.8 F per mph The average rate of change (in windchill temp per mph) is the change in windchill divided by the change in windspeed: 4-20 ----------= -16/20= -0.8 per mph Subscribe to view the full document.

20-0 Question 8 1 / 1 pts The table below shows the Earth's atmospheric pressure p in kiloPascals (kPa) as a function of the altitude h, in kilometers (km), so p = f(h). Is f(h) an increasing function or decreasing function? Is it concave up, concave down, or linear? h (altitude in km) 0 2 4 6 8 10 p = f(h) (pressure in kPa) 100 80 6 2 47 35 27 f(x) is decreasing and concave down. Correct! f(x) is decreasing and concave up. f(x) is increasing and concave down. f(x) is decreasing linearly. f(x) is increasing and concave up. is decreasing. Notice that the size of the decrease is getting smaller as gets larger. This means that is concave up. This may be more clear by looking at a plot plot of the points in the table Question 9 0 / 1 pts A graph of a function f(x) is shown above. On the interval [a,b], state whether f(x) is increasing or decreasing. Also whether f(x) is concave up, concave down, or linear on the interval [a,b]. Subscribe to view the full document. What students are saying

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