Use the table to answer the questions. Substances
A grain of salt
A grain of sand
A grain of sugar
A grain of rice
Mass (B)
5.6 x 10
7x10*
3x10
6.8 x 102
Find the total mass in each combination
Write your answer in scientific notation and round the coefficient to the nearest tenth.
a.) A grain of salt and a grain of sand.
b.) A grain of rice and a grain of sugar.
What is the difference in mass between a grain of salt and grain of sand.
How much heavier/lighter is a grain of rice as compared to a grain of salt.

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i believe a. 12x≥120 is the answer

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the answer is: 5,953.2 mm²

you have the  8-sided octahedron as a composite figure that has 2 square pyramids. so, you should   apply the formula for the calculated area of a square pyramid as so:   a=s²+2sl

  a is the area of the square pyramid.

  s will be the base of the square pyramid (s = 33 mm).

  l is the slant height of the square pyramid (l = 28.6 mm).

then, when you substitute these values into the formula you get:

  a=s²+2sl

  a=(33 mm)²+2(33 mm)(28.6 mm)

  a=1089 mm²+1887.6 mm²

  a=2,976.6 mm²

thus, the area of the  surface area of the octahedron is:

sa = 2a

sa = 2(2,976.6 mm²)

sa = 5,953.2 mm²

thus the answer will be: 5,953.2 mm²