When 40% of a number is added to the number the result is 210 what is the number

In the 30-60-90 triangle below side s has a length of and side r has a length

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

If chord ab is congruent to chord cd, then what must be true about ef and eg?