Can somebody please answer this

Which math sentence can be used to determine if the triangle is a right triangle?

If your annual gross income is $62,000 and you have one monthly car payment of $335 and a monthly student loan payment of $225, what is the maximum house payment you can afford. consider a standard 28% front-end ratio and a 36% back-end ratio. also, to complete your calculation, the annual property tax will be $3,600 and the annual homeowner's premium will be $360.

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.