What value of a will make the following equation true?

Sherina wrote and solved the equation. x-56=230 x-56-56=230-56 x=174 what was sherina’s error? sherina’s work is correct. sherina only needed to subtract 56 from 230. sherina made a subtraction error when subtracting 56 from 230. sherina should have added 56 to both sides of the equation.

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

How do i find the missing angle measure in a polygon