9. -7/12
10. -2.75
11. 1.844
12. 4.539
The inequality should read:

Subtract 2 from all the terms:

Divide all the terms by -5 to get x by itself (note that you flip the inequality signs as you divide by a negative):

The inequality is 2 ≤ x < 8.
A closed dot represents ≤, and an open dot represents <. Since x can represent all values between 2 and 8, you will shade in between 2 and 8 on the number line. x is greater than or equal to 2, so there will be a closed dot on 2. x is less than 8, so there will be an open dot on 8.
The answer is 'number line with a closed dot on 2 and an open dot on 8 and shading in between'.
Answer:

To get the area of the quadrilateral to do see the 4 sides do all four side 7x7x7x7
Cos x=5/12. Solve for x which is 65.37 degrees.
No, 43 is a prime number, so that statement is false.