2-29. A DVD player (or a CD-ROM reader) works by bouncing a laser off the surface of the DVD, which acts like
a mirror. An emitter sends out the light, which bounces off the DVD and then is detected by a sensor. The
diagram at right shows a DVD held parallel to the surface of the DVD player, on which an emitter and a
sensor are mounted.

rotated. i took the test

step-by-step explanation:

i can't see the picture : /

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.