ok so this is a diamond problem and the x is 1/3 and y is -4/9 what are xy and x+y ?? sorry if i sound bad im kind of bad at diamond problems need help asap

Ineed in figuring out this problem.

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.