Hello,
After decrypting the question:
f(x)=2x^4-4x^3-11x^2+3x-6
f(-2)=2(-2)^4-4(-2)^3-11(-2)^2+3*(-2)-6=2*16+32-44-6-6=8
Here, we are required to determine how many hours will it be until the next instance when both foghorns sound at the same time.
The <em>lighthouse A and B </em>will have their foghorns sound at the same time after 30 hours.
- <em>Since lighthouse A sounds it's foghorn every 3hours, and lighthouse B sounds it's foghorn every 10 hours.</em>
To determine the next time when both foghorns sound at the same time;
We need to determine the lowest common multiple (LCM) of 3 and 10.
- The <em>lowest common multiple</em> of 3 and 10 is therefore 30.
As such, the foghorns sound at the same time after 30 hours of when the foghorns sounded the same time.
Read more:
brainly.com/question/18642054
5x^3 - 5x - 8 + 2x^3 + 4x + 2
7x^3 - x - 6 (some like terms)