Answer: 3
Step-by-step explanation:
Answer:
A. 3x^2 + 4x + 1
Step-by-step explanation:
A is the correct answer because there are three terms within the trinomial
Answer:
8.4 dollars
Step-by-step explanation:
The error is in the resolution of the proportion. In fact, the initial proportion is correct:

where x is the total cost. However, the following step of the resolution is wrong. In fact, the correct resolution is the following:
- Multiplying by x on both sides:

- Multiplying by 3.5 no both sides:

And now we can find x:

So, the total cost is 8.4 dollars.