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Step-by-step explanation:

Since we have only one variable i.e x ,this problem is as easy as that

We know that sum of all interior angles of a triangle is 180 degrees

=> <A+<B+<C=180 degrees

(x-4)+(11x-11)+(x+13)=180

x-4+11x-11+x+14=180

x+11x+x=180+4+11-14

14x=182

x=182/14

x = 13

<C=x-4

13-4

9

m<C = 10°

Step-by-step explanation:

Given,

m<C = (x-4)°

m<D = (11x-11)°

m<E = (x+13)°

Now,

x-4°+11x-11°+x+13° = 180°{ the sum of angle of triangle is 180°}

or, 13x-2° = 180°

or, 13x = 180°+2°

or, x = 182°/13

or, x = 14°

therefore, x = 14°

m<C = (x-4)°

= 14°-4°

= 10°

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step-by-step explanation:

1+2+3+4+5+6+7+8+9+10 = 55

2*10 = 20

55-20 = 35

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2