Which of the following is true regarding cross-sectional data sets? Check all that apply. The data are collected multiple times over several different time periods. The data consist of only one individual, tracked over time. Most observations are not independent across time. The data are collected at approximately the same point in time.

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step-by-step explanation:

if i knew id you bro,, my bad

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