What is the Area of this circle

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

How to use order of operation in 20 divide by 4 multiply 5 = 1

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?