Answer:
3(x + 5) and x = 55
Explanation:
1. A straight line equals 180 degrees. Therefore, either the first or third equations are correct.
2. There are three equations of (x + 5), therefore, you multiply that equation 3 times to get the total number of degrees as 180.
3. When you multiply 3 by the equation, you can not only multiply it by x, you would have to multiply the whole equation. If you write 3x + 5, then 3 is only being multiplied by x. However, if you write 3(x + 5), then 3 is being multiplied by everything within the parenthesis. Therefore, the third answer is correct.
4. Now that you know the correct equation, you can solve for x by isolating the variable.
- Divide both sides by 3:
- Subtract both sides by 5:
