4. When two more people get into the car described in Sample Problem 12C, the total mass of all four occupants of the car becomes 255 kg. Now
what is the period of vibration of the car when it is driven over a
pothole in the road?

because it says use -2,0,and 2 for x, we can plug those numbers into the equation. y/4=3/4(-2)+2   y/4= -1 1/2 +2 now to get x by itself, we can multiply each side by 4. y=-6+8 which equals y=2 when x=-2. now you can do the same thing with 0 and 2 as x. you get y=8 when x=0 and y=14 when x=2.

x   |   y

-2 |   2

0   |   8

2   |   14

which three statements are true about all alloys?

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray