С (8x – 3)º
D
B (108°
(14x - 25)
133) E
(10x – 5)
-
52°
A
F

Please help my homework I still struggle

 = 12

Step-by-step explanation:

The shape ABCDEF is an irregular polygon.  

The sum of the interior angles of any regular or irregular polygon = (n - 2) x 180 (where n is the number of sides of the polygon).  

Therefore, the sum of the interior angles of shape ABCDEF = (6 - 2) x 180 = 720°

So to find the value of , we need to add together all the interior angles and equal it to 720, then solve for .

Before we do that, we need to determine angle F.

From inspection, we can see that angle F and 52° are a linear pair.  We know that a linear pair of angles add up to 180°, so F + 52 = 180  ⇒  F = 180 - 52 = 128°

Therefore:

                                           A + B + C + D + E + F = 720

(10 - 5) + 108 + (8 - 3) + (14 - 25) + 133 + 128 = 720

Collect like terms:

10 + 8 + 14 - 5 + 108 - 3 - 25 + 133 + 128 = 720

Combine like terms:

32 + 336 = 720

Subtract 336 from both sides:

32 = 384

Divide both sides by 32:

= 12

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9

5+2x=a

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