What is the maximum IRA contribution that Layla can make under each of the following assumptions?

Layla is age $22$ and single. Layla$$s only income is $$14,000$ of interest and dividends from a trust fund.

Layla is age $30$ and single. Layla$$s only income is a $$35,000$ distributive share of ordinary business income from a partnership.

Layla is age $60$ and single. Layla$$s only income is $$44,000$ wages.

Layla is $45$ and files a joint return with Loren. Layla$$s sole proprietorship generates an $$8,200$ loss and Loren$$s salary is $$50,000.$