Fast!
the picture at the top is the question! only focus on

Step-by-step explanation:

How many years are in a decade? The answer is 10. Deca means 10.

Decades = years / 10

Decades = 30 / 10

Decades = 3

So

f(x) = 5000 * 2^x

f(x) = 5000 * 2^3

f(x) = 5000 * 8

f(x) = 40000

a function could be identified in 3 ways either on a chart,graph, or ordered pairs. first a function is that each point has its own. the rule is that there can be many x's to one y but there can not be 2 x's at different y's. so on a graph when you put a straight line through the y's there should be one dot only to be a function.

step-by-step explanation: