By which number should (2/5)^-3 be multiplied to get (1/2)^4 as a product ?​

Sal is tiling his entryway. the floor plan is drawn on a unit grid. each unit length represents 1 foot. tile costs $1.35 per square foot. how much will sal pay to tile his entryway? round your answer to the nearest cent.

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

What is the the greatest common factor ?