Question

2(0.3)^3+(0.4)^3+(0.5)^3+(-0.7)^3+(-0.8)^3

Answer 1

   2(0.3)^3 + (0.4)^3 +(0.5)^3 + (-0.7)^3 +(-0.8)^3

= 2(0.027) + (0.064) + (0.125) + (-0.343) + (-0.512)
= 0.054 +0.064 +0.125 -0.343 -0.512
= 0.243 -0.343 - 0.512
= - 0.100 - 0.512
= -0.612