Will someone explain to me this problem?:

Rubio recently invested $20,000 (tax basis) in purchasing a limited partnership interest. His at-risk amount is $15,000. In addition, Rubios share of the limited partnership loss for the year is $22,000, his share of income from a different limited partnership was $5,000, and he had $40,000 in wage income and $10,000 in long-term capital gains.

a.	How much of Rubios $22,000 loss is allowed considering only the tax basis loss limitations?

Tax Basis Limitation ?

b. How much of the loss from part (a) is allowed under the at-risk limitations?

At-Risk Limitation ?