Question

Help me to solve this

Answer 1

the answer is 2cm

$8 \times 10 {}^{ - 3} \times 250 = 2000 \times 10 {}^{ - 3} \\ = 2$
or:
$8 \times {10}^{ - 3} \times 250 = 0.008 \times 250 \\ = 2$

good luck