Mark the red letter shown in the brackets the subject of the formula

Hi my sisters and brothers can tell me the answer because i don’t understand the question

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

Cherie works in retail and her weekly salary includes commission for the amount she sells. the equation s=400+0.15c models the relation between her weekly salary, s, in dollars and the amount of her sales, c, in dollars. interpret the slope of the equation.