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Answer:
45
Step-by-step explanation:
1. All angles in a triangle add up to 180°, so that means 30° + (2x + 10)° + 50° = 180.
2. With the equation we just formed, let's solve for x.
Step 1: Simplify both sides of the equation.
Step 2: Subtract 90 from both sides.
Step 3: Divide both sides by 2.
3. Now that we got the value of x, let's test it to see if it really is the correct answer.
Nice! This means that our answer is correct.
Therefore, x = 45.