Andy estimated that he would need 80 feet of lumber for a tree house project. he later found that the actual amount of lumber needed was 69 feet. what was the percent error of andy's estimation? ∴

36 inches/second = yards/minute how many yards?

Acarnival sold tickets for $1.50 for adults and $1.00 for students. there were 54 tickets sold for a total of $70.50. write a system of equations to represent the number of adult tickets,x, and the number of student tickets,y. find the solution and explain what it means. i'll you if you me

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?