Ww

x = 33°

explanation:

The interior angles sum up to 180°

solve:

x + 20° + 4x - 5° = 180°

x + 4x + 20° - 5° = 180°

5x + 15° = 180°

5x = 180° - 15°

5x = 165°

x = 33°

x = 33

Step-by-step explanation:

Sum of consecutive interior angles = 180°

⇒ (x + 20) + (4x - 5) = 180

⇒ 5x + 15 = 180

⇒ 5x = 165

⇒ x = 33

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1