Please can I also have help with these too? Thank you

d) vse SYMTETRY q1=q2 ro save for q DQ. PWG INTO P TO GET HARKET Prict. PLUGINTO PROFT FINCT1ONS TO GG P.CoflTS 2. SALOP- BERTROND 3 FIRMS EARA FIFM'S DGMND FUNCTIONS NRT q1=21p2+21p3p1+aq2=21p1+21p3p2+aq3=21p1+21p2p3+a zRO cos5 AG AIN a) WHY DOES THE FITM'S OGMAND FUNCTDON HVVE A MIMS (-) IN FRONT OF ITS OWN Price BUT PLUS (+) IN FRONT OF OHHER FIRAS PRICES? d) vse SYMTETRY q1=q2 ro save for q DQ. PWG INTO P TO GET HARKET Prict. PLUGINTO PROFT FINCT1ONS TO GG P.CoflTS 2. SALOP- BERTROND 3 FIRMS EARA FIFM'S DGMND FUNCTIONS NRT q1=21p2+21p3p1+aq2=21p1+21p3p2+aq3=21p1+21p2p3+a zRO cos5 AG AIN a) WHY DOES THE FITM'S OGMAND FUNCTDON HVVE A MIMS (-) IN FRONT OF ITS OWN Price BUT PLUS (+) IN FRONT OF OHHER FIRAS PRICES