A number written in scientific notation has the form $a{10}^k,$ where $1a<mn\; id="EditorElement\_1065227">1</mn><mn\; id="EditorElement\_1065228">0</mn>$ and $k$ is an integer, that is$,k$ is one of $...-3,-2,-1,0,1,2,3$dots.

Part A

Determine the values of a and $k$ when $299,790,000$ is written in scientific notation.

Enter a and $k,$ separated by commas.

$a,k=$

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Part B

Determine the values of a and $k$ when $0\mathrm{.}51$ is written in scientific notation.

Enter a and $k,$ separated by commas.

$a,k=$