Question

please answer the 9th one correctly and step by step​

Answer 1

Step-by-step explanation:

let,

one angle =x

another angle =y

x:y=5:7

"a" is the variable for a number which is divided by x,y such that 5a:7a=x:y

we know :

The sum of adjacent angles=180

so:

5a+7a=180

12a=180

a=180/12

a=15

Angles:

x=5a

=5(15)

x=75

y=7a

7(15)

y=105