Respuesta :

Answer:

y=42°

Step-by-step explanation:

We see the big triangle is split into 2 triangles.

The lower triangle is composed of 90°, 48°, and y.

since the angles must add to 180°,

180°-90°=90°      90°-48°=42°

y=42°

Check:

42+48=90

90+90=180°

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