Picture showing four cards in a row with labels 'first animal appears on land', 'first life form appears in the sea', 'first rocks formed on earth', and 'first flowering plants appear on land'.

a student arranged the four cards sequentially in a row on the basis of the periods when the events occurred. the card showing the earliest event was placed on the extreme left. which of these cards was placed first in the row?

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

The process of predicting values that extend beyond the range of data points is called absolute value extrapolation interpolation prediction for any given: )

If the area of a square has increased by a factor of 16, by how much has each side increased?