1 Answer

Vitaliis · Answer 1 · 2021-10-01T06:37:34+0000

Answer:

C

Explanation:

There's a property of cyclis quadrilaterals that say that opposite sides will add up to 180

so we have

$5x+75=180\\\\5x=180-75\\\\5x=105\\\\x=21$

which is option c

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