If ab - 27 and bc=13 then find the length of ac

Aswim teacher sells lesson packages. the best deal has the highest ratio of lessons to total cost.swim lesson packagesnumber of lessons total cost$10$4010 1 $8015$80which package is the best deal? l lesson for $105 lessons for $4010 lessons for $8015 lessons for $80mark this and returnsave and exit

Math each whole number with a rational,exponential expression

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3