You just need to plug those expressions inside the formula: it doesn't matter if they're expressions involving a variable instead of plain numbers: the formula becomes

If you want, you can simplify it by expanding the square and then multiply the two parenthesis:

Answer:
$16,028.85
Working out:
(On calculator) 42,500 x 0.85^6
The submarine would be 1,620 ft if i’m understanding the question correctly
Answer: 
<u>Step-by-step explanation:</u>
(1) (12, 18, 27, ...)
The common ratio is:

The equation is:


The equation is:

Answer: x= 182 - 12x
Step-by-step explanation: