What is the measure of the smallest angle?

 45 degrees.

Step-by-step explanation:

The middle angle of a right angle is  90 degrees and half of the 90 degrees is 45.

Step-by-step explanation:

let the middle angle=x

then

so angles are 30°,60°,90°

smallest angle=30°

the graph on the bottom right

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168