Answer:
4
Step-by-step explanation:
Quarter hour on chemistry
Quarter hour on class 2
Quarter hour on class 3
Quarter hour on class 4
Total time....One hour
The sum of measures of angles A and B is 90°
Hence the angles are complementary
-5
el número anterior a -7 es -10 y -10+5 es -5
55 is the answer hope it helps...
