Triangle JKL is shown below. which of the following is not a true statement about the angles in the triangle?

Please show step by step insturctions

A, B and D are true statements.

Step-by-step explanation:

The sum of the angles in a triangle is 180 degrees. It means that

7x + 2 + 8x + 4x + 7 = 180

Collecting like terms, it becomes

7x + 8x +4x + 2 + 7 = 180

19x + 9 = 180

Subtracting 9 from both sides of the equation, it becomes

19x + 9 - 9 = 180 - 9

19x = 171

Dividing both sides of the equation by 19, it becomes

19x/19 = 171/19

x = 9

Angle J = 7 × 9 + 2 = 65 degrees

Angle K = 8x = 8 × 9 = 72 degrees

Angle L = 4x + 7 = 4 × 9 + 7 = 43 degrees

Therefore, A, B and D are true statements.

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step-by-step explanation:

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see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -