Question

how to decide to wheter to add or subtract between these questions pls reply

Answer 1

Answer:

Which class

then I will tell answer

Answer 2

Answer:

a) x = 13

b) x =20

Step-by-step explanation:

a)

83+(6x+19)=180°

6x+19=180-83

6x+19=97

6x=97-19

6x=78

x=78/6

x=13

b)

DOE + DOB =180

62° + DOB = 180

DOB = 180 - 62

DOB =118

(3x+2)+DOB =180

(3x+2)= 180-118

3x+2=62

3x=62-2

3x=60

x=60/3

x=20