Pls explain step by step and pls yell by are adding dividing multiplying etc

If g(x) is an odd function, which function must be an even function?

In the given triangle, ∠aed ∼ ∠ abc, ad = 6.9, ae = 7.2, de = 5.2, and bc = 10.2. find the measure of bd and ce. round your answer to the nearest tenth.

Find the arc length of the semicircle. 7the grade