Each square on jackson’s chessboard is 13 square centimeters. a chessboard has 8 squares on each side. to the nearest hundredth, what is the width of jackson’s chessboard?

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

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22