Question

you can use a calculator to solve this simple sum
please help me guys

Answer 1

$\frac{3.1 \times 20}{0.31 \times {10}^{ - 9} } \\ \frac{310 \times 20 \times {10}^{9} }{31} \\ = 2 \times {10}^{11}$ease follow me

Answer 2

heya,
0.31 to 3.1 jus multiply by 10
0.31 to 31 multiply by 100

hope it helps!