Question

HELP MEE PLZZZZ I DON'T UNDERSTAND THIS

Answer 1

Answer: Choice D.
`6.44 * 10^(-4)`

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Work Shown:

We multiply the coefficients 9.2 and 7 to get 64.4, which is the same as 6.44*10^1 in scientific notation. When multiplying exponential expressions with the same base, we add the exponents

This is what the steps could look like

`\left(9.2 * 10^(-9)\right)*\left(7 * 10^(4)\right)\\\\\left(9.2*7\right)*\left(10^(-9) * 10^(4)\right)\\\\\left(64.4\right)*\left(10^(-9+4)\right)\\\\\left(6.44* 10^(1)\right)*\left(10^(-5)\right)\\\\6.44*\left(10^(1)* 10^(-5)\right)\\\\6.44*\left(10^(1+(-5))\right)\\\\6.44* 10^(-4)\\\\`

The final result is in scientific notation as the coefficient c is restricted such that
`0 \le c < 10`