Answer:
-9
Step-by-step explanation:
b² - c²
= 4² - (-5)²
= 16 - 25
= -9
Answer:
OC. the graph crosses the x-axis
question 3: -2
question 4: 0
Ordered pairs in a graph go in the sequence of (x, y)
Answer:

Step-by-step explanation:
From the graph, we can conclude that,
is less than 2 and not including as there is a hollow circle at the mark 2.
Also,
is greater than or equal to 7 including 7 as there is a solid circle at the mark 7
So, the compound inequality will be 
Now, the option that simplifies to the above inequality is the required answer.
Let us check the first option.


Therefore, option 1 simplifies to the above compound inequality.
So, the correct answer is option 1.
Step-by-step explanation:
Area of the circle = pi×r²
= 22/7 × 6 × 6
= 113.14 unit²