Heights for group of people normally distributed with mean = 63 inches and standard deviation = 2.7 inches

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

What expression is equivalent to 42x-56y

Can you me find the missing length. i attached an image.