Question

Can someone help me?

Answer 1

Divide both sides by 9.92 to get 405/992, you can remove the decimal safely.

Answer 2

- 4.05 = 9.92 x g
to isolate g and find its value, you have to divide by 9.92 on either sides

$\frac{-4.05}{9.92} = \frac{9.92g}{9.92}$ (9.92 and 9.92 cancels out)

- 0.408266129 = g
You can round it to appropriate significant figures