2(x^4 - 10x^2 - 39)
2(x^2 - 13)(x^2 + 3)
Letter B
So given the values on the number line, AB and BC, adding them together will get the length of AC. If AB equals

and BC equals

, the value of AC should be

. Since you are given the length of AC,

, you can create an equation to solve for x. This equation would be

. Isolating the x on the left (or right hand side) gets the value of x to be 19. The same thing goes for the 2nd question.
Answer:
B
Step-by-step explanation:
The answer is (5,4). X being the run (5), and Y being the rise (4).
Answer:
circumference=15.7 feet
Step-by-step explanation:
5x3.14=circumference=15.7