Question

please help me for brainlist and 10 points​

Answer 1

Answer:

140°.

Step-by-step explanation:

B=2×45+15=105°.

C=3×45+5

=140°.

Answer 2

Answer:

Given b=2a+15°

c= 3a+5°

d=70°

a=?

Find

b=?

c=?

we know that sum of quadrilateral is 360°

a+b+c+d= 360°

a+(2a+15°)+(3a+5)°+70° = 360° (remove the bracket)

a+2a+15°+3a+5°+70° = 360° (add all the (a) )

6a+15°+5°+70° = 360° (add 15°,5°and 70°)

6a+90° = 360°

6a = 360° - 90°

6a = 270°

a = 270°/6

a = 45°

Therefore

a = 45°

b= 2a+15° = 2×45°+15° = 90°+15° = 105°

c = 3a+5° = 3×45 +5+ = 135°+5° = 140°

Step-by-step explanation:

Hope it helps you

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