$\"\"$

(a)

Angle between $\"\"$ mi/h and $\"\"$ mi/h is $\"\"$ .

Since angle between $\"\"$ mi/h and $\"\"$ mi/h is $\"\"$ , $\"\"$ mi/h makes an angle is $\"\"$ .

Find $\"\"$ correspond to how many miles per hour.

$\"\"$

$\"\"$ correspond to $\"\"$ mi/h.

$\"\"$

(b)

The angle of speedometer changes is $\"\"$

Speed of the car increase is $\"\"$ mi/h.

$\"\"$

(a) $\"\"$ correspond to $\"\"$ mi/h.

(b) Speed of the car increase is $\"\"$ mi/h.