Question

answer number 15 any one please step by step​

Answer 1

Answer:

I'm doing the second

Step-by-step explanation:

given-

(2x+2) and (2x-7)

by angle sum property-

x +(2x+2)+(2x-7)=180

x+2x+2+2x-7=180(opening the bracket)

5x=180-2+7

5x=185

x=185/5

x=37°

(2x+2)=2(37)+2

=76

(2x-7)=2(37)-7

=67

verification-

37+76+67=180

180=180(verified)

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Answer 2

Answer:

a°=20°, b°= 130° & c°= 50°

Step-by-step explanation:

Triangle ADE

sum of angles of a triangle is 180°.

180° =60° +70° +angle(c)

Angle(c) = 180° - 130°

=50°

Also angle of a straight line =180°

180° = 50°+ b°

b°=180° - 50°

=130°

Now In triangle ADB

Sum of angles =a° + 30° +130°

180° =a° + 160°

a° =180° - 160°

a° =20°

Hence a°=20°, b°= 130° & c°= 50°