∠abc and ∠def are supplementary.
m∠abc=138°
what is the measure of ∠def ?

42°
90°
138°
180°

As the angles are supplementary, their sum would be equal to 180
∠ABC + ∠DEF = 180
138 + ∠DEF = 180
∠DEF = 180 - 138
∠DEF = 42

In short, Your Answer would be Option A

Hope this helps!

Which of the following values are in the range is the function graphed below? check all that applya.3b.1c.0d.-2e.5f.2a

At a constant it will take one hour to travel 32 mi.at that speed it will take 1/2 hr to travel the remaining 16 mi.it will take 1+1/2 hr to travel the 48mi @ 32mph.so 1 hr = 60 min& 1/2 hr = 30 min1+1/2 hr = 90 min.there are 60s in each 90 × 60 = 3600 seconds.the real question seriously is he why are they driving so slow? ! lol.