Does anyone knows how to do this I need help

See attachment below and find the equivalent of tan(∠qsr)

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?