Please Explain it- Math

It is a horizontal line. The slope = 0.

The line cuts the y-axis at the point  

(0,9)

Step-by-step explanation:

y=9

is the equation of a horizontal line. The slope is 0.

If we write it in slope-intercept form we will have:

y=0x+9

This means that for any value of  x

that is chosen, the y-value is always 9 Hence  y

x=9.

The y-intercept is at the point  

(0,9)

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

the answer is 31.27mph