I NEED HELP . I jus got back to school after like two weeks and I haven’t learn nothing

In which research method does a researcher change the value of one variable to determine how the change affects another variable? a. experiment b. observational research c. survey d. case study

How do quotas domestic producers? quotas facilitate increased exports of domestic goods. quotas lower the cost of domestic goods. quotas limit the number of producers that compete in a sector. quotas facilitate the sale of more domestic goods.

Part b forty-year-old kyle wants to start investing for retirement. he wants to select a personal investment plan that will allow him to withdraw funds without paying penalties and taxes once he turns 59.5. which retirement plan should he choose? a. traditional ira b. roth ira c. 401(k)