Answer:
7. A
8. C
9. C
10. A
Step-by-step explanation:
You just have to work each one out. This is very simple.
Answer:
1/6? it has the common denominator
3x - 17 = 9x + 7
Rearrange on same sides
-17 - 7 = 9x - 3x
-24 = 6x
Divide by 6 on either sides to isolate 6

6 and 6 cancels out
-4 = x
Answer is:
B. x = -4
For this case we have that by definition, the equation of the line of the slope-intersection form is given by:

Where:
m: It is the slope of the line
b: It is the cut-off point with the y axis
We have the following equation:

We manipulate algebraically to write the equation of the slope-intersection form:

We check if the given point belongs to the equation:

The point does not belong to the equation.
ANswer:

General Idea:
We can use the below formula to find the area of sector (A), when angle of sector and radius is given:

Applying the concept:
We need to substitute 84 for
and 160 for A in the above formula:

Conclusion:
If a windshield wiper covers an area of approximately 160 square inches when it rotates at an angle of 84°, the length of the wiper to the nearest tenth of an inch is <u>14.8</u>