math genious help pleased?

Question

6. Find the number of sides of a regular polygon if each interior angle measures .
The number of sides is:
A. 20
B. 16
C. 24
D. 18
7. The sum of the measures of the exterior angles of a regular hexagon is:

A. 720°
B. 1440°
C. 1080°
D. 360°
8. Use the following polyhedron to answer the question.

The number of vertices is:
A. 12
B. 10
C. 8
D. 6
9. The side of a regular pentagon is 12 cm. Find the perimeter.
The perimeter is:
A. 60 cm
B. 72 cm
C. 30 cm
D. 36 cm
10. Use the following polyhedron to answer the question.

The number of faces is:
A. 5
B. 4
C. 3
D. 6
11. The measure of each interior angle of a regular decagon is:

A. 144°
B. 36°
C. 108°
D. 150°

Answer 1

6. Question incomplete

7. 360

8. Question incomplete

9. 5*12 = 60 cm

10. Question incomplete

11. 180 - 36 = 144 degrees

Answer 2

Im not answering the questions for you, as that is cheating. However, I'm feeling nice so here's some tips: 1) a rectangle has 4 sides, 2 times it's length and 2 times it's width (but im sure you knew that already :oP) 2) and 5) multiply everything inside the brackets by those outside the brackets. 3) add (or minus if they look like this -x) all the xs and numbers together 4) to make 16x^2 can either be a combination of x and 16x, 2x and 8x or 4x and 4x. similarly +9 can be made with +1 and +9, -1 and -9, +3 and +3, -3 and -3. Which of these in combination when you expand the brackets make -24x? 6) look at the numbers of each power of x. 7) go through each possibly mistake and see if it's right OR go through the factorising yourself and compare. 8) move the number over the other side so that it = 0 and factorise. Once in brackets you should have 2 values of x that make the whole equation = 0 Hope this helps

Answer 3

You might have considered the fact that some of these questions clearly referred to pictures that you did not include, before trying to get somebody else to do your homework. But here's some pointers.

The number of sides and the sum of the interior angles of a regular polygon are related by the equation: sum of angles = number of sides minus two, times 180 degrees. Thus the interior angles of a triangle add up to 3-2(180) = 180, of a square add up to 4-2(180) = 360, etc. The measurement of each exterior angle is the 360 minus the interior angle. The perimeter is the side length times the number of sides.

It doesn't take a math genius, really. If you can post this stuff up here, I'm sure you can solve these problems.