Which shows the best use of the associative and commutative properties t make simplifying 2/5-15+ 8-1/5+3 easier? A [2/5 + (-15)] +[8+(-1/5)+3 B.[3+2/5+(-15)] +[(-1/5) + 8)
C.[2/5+(-1/5)]+[8+3+(-15)]
D.[2/5+8+(-15)]+[3+(-1/5)]

Nthe opening scene of the movie raiders of the lost ark, indiana jones replaces a golden statue with a bag of sand. the platform on which the statue is placed is designed to detect the mass of the statue. if the bag of sand has a different mass than the statue, then a mechanism triggers and destruction ensues. the density of gold is about 20\text{ g/cm}^320 g/cm 3 20, space, g, slash, c, m, start superscript, 3, end superscript. the density of sand can be estimated at 2.5\text{ g/cm}^32.5 g/cm 3 2, point, 5, space, g, slash, c, m, start superscript, 3, end superscript. the gold statue can be modeled as a cylinder with height 25\text{ cm}25 cm25, space, c, m and radius 8\text{ cm}8 cm8, space, c, m. in terms of \piπpi, what is the mass of sand indiana jones needs to avoid triggering the mechanism?