option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did not satisfy the given simplify expression.

4038

step-by-step explanation:

pleaze mark brainliest!

60°

Step-by-step explanation:

The sum of the interior angles of a polygon is

sum = 180° (n - 2) ← n is the number of sides

Here n = 5 ( pentagon ), thus

sum = 180° × 3 = 540°

let x be the size of the equal angles

Sum the interior angles and equate to 540

(3 × 140 ) + 2x = 540

420 + 2x = 540 ( subtract 240 from both sides )

2x = 120 ( divide both sides by 2 )

x = 60

Thus the size of 1 of the 2 equal angles = 60°

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