Which equation could be used to solve problems involving the relationships between the angles? a) (12 + a) + (7a + 12) = 90 b) 90 + (12 + a) = (7a + 12) c) (12 + a) − (7a + 12) = 90 d) (7a + 12) − 90 = (12 + a)

A) The equation that can be used to solve problems involving the relationships between the angles is  (12 + a) + (7a + 12) = 90

Step-by-step explanation:

Here, the question seems a bit INCOMPLETE.

I am attaching the correct figure for the reference.

The sum of the given two angles makes a right angle.

Also, the angle which has a measurement of EXACTLY 90° is called a Right Angle.

So, the sum of both angles makes a Right Angle.

⇒  ∠  (12 + a)  +   ∠  (7a + 12) = 90°.

Hence, the equation that can be used to solve problems involving the relationships between the angles is A) (12 + a) + (7a + 12) = 90

y=x+9

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step-by-step explanation: