10 sides
360-72=288
288 divided by 2 is 144
Decagon have 144 degree interior angles
Perimeter of a square = 4L
4L = (8x+12)ft
L= (2x+3)ft
Answer:
w=9
Step-by-step explanation:
I hope this image is helpful to you.
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Answer:
Therefore
15.

16.

17.

Step-by-step explanation:
15.

Using the Identity (a + b)(a - b) = (a² - b²) we get
Consider here a = 5c and b = 3 then we will have
.....as required
16.

Here Factorize 8 such that sum up to be 9
∴ 8 × 1 = 8 and 8 + 1 =9
... as required
17.

Here Factorize 21 such that sum up to be -10
∴ -3 × -7 = + 21 and -3 - 7 = - 10
........as required
Therefore
15.

16.

17.

The way to solve this is by doing 16/2 which is 8=8 and 4 multiplied by 8 will be 8=8