( pic included ) PLEASE HELP I WILL MARK YOU BRAINLIEST IF CORRECT!!! thank you so much to whoever answers it means so much:)))
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What rotation was applied to triangle def to create d’e’f’?

The measures of two supplementary angles are (2x + 10)° and (8x + 10)°. what is the measure of the larger angle? a. 16° b. 44° c. 14° d. 138°

Arace is 10 kilometers long.markers will be placed at the beginning and end of the race course and at each 500 meter mark.how many markers are needed to mark the course for the race?