zeesharpe05
07.12.2020 •
Mathematics
PLEASE HURRY
-6y+17=3y-10
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Ответ:
3
Step-by-step explanation:
-6y + 17 = 3y - 10
+6y +6y
17 = 9y - 10
+10 +10
9y = 27
divide both sides by 9
y = 3
Ответ:
a = 49°
Step-by-step explanation:
OB = OC ( both radii of the circle ), thus
Δ BOC is isosceles and the base angles are congruent, that is
∠ OBC = ∠ OCB = 41° , so
∠ BOC = 180° - (2 × 41)° = 180° - 82° = 98°
The angle on the circumference BAC is half the angle at the centre for angles subtended on the same arc , thus
a = 0.5 × 98° = 49°