An equation in slope-intercept form for each line

30,40,50 is correct answer

it's possible to build a triangle with side lengths of 3, 3, and 9.- true ( b.)

we know that

1) the inscribed angle measures half of the arc it comprises.

so

m∠dgf= > expression

2) the opposite angles in an inscribed quadrilateral are supplementary angles

so

m∠dgf=

m∠dgf=°

substitute in the expression to find the value of arc ef

therefore

the answer is

the measure of the arc ef is