What’s the equivalent expression in expanded form (2x-5)^2

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

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base