Question

How do I set up the polynomial?
The average income in thousands of dollars for a single Hispanic family in the United States t years since 2000 can be estimated by using the expression:
1.5t+42
The number of Hispanic families in millions in the United States t years since 2000 can be estimated by using the expression:
0.3t+8.4

Use the given expressions to write a new expression for the total income of all Hispanic families in the United States