1. What is the equation of this graph? {applet}
{image} 1. 2. 3. 4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2. The relationship between the Fahrenheit and Celsius temperature scales is given by the linear function {image} . Find the slope using 20 and -15. Choose the answer from the following:
1.8 63
-35 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

3. The monthly cost of driving a car depends on the number of miles driven. Julia found that in October it cost her $500 to drive 500 mi and in July it cost her $540 to drive 700 mi. Express the monthly cost C as a function of the distance driven d assuming that a linear relationship gives a suitable model. Choose the answer from the following:
C = 400d + 0.2
C = 0.2d + 400 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50