Erica recently invested in gold that is growing in value 4% annually. she invested $4000 initially. find the value of her investment after 6 years?

Math i have no idea how to do a and b

Meee i honestly dont know what this question talking about

How do you find p(a and b) if a and b are independent events for two or more actions, such as tossing a coin twice and finding p(heads and heads)? 2. how do you find p(a or b) if a and b are independent events for one action, such as spinning a four-color spinner once and finding p(red or blue)?