1. How many square tiles each with a side of 90 cm are needed to cover a square-shaped floor of side 900 cm

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0