8x+54x+140 where x is the number of $1 increases in prices

(-8×1)+(54×1)+140=186

(m+11n)^2=(m+11n)(m+11n)=m^2+11mn+11mn+121n^2=m^2+22mn×121n^2 for example; use foil: (a+b)(a+b)first. a^2outside. abinside. ablast. b^2