Question

PLEASSEE HELP MEEE WITHH THESEEE

Answer 1

Answer:

Q1: (a)

$1cm \: = 10 {}^{ - 2}m$

so

$45 \times {10}^{ - 2} m$

Q2:

$1km = 10 {}^{3} m \\ 6378km \times {10}^{ 3}$

this is the radius in meter

diameter = 2r

in this i don't know which choice is the right answer

Q3:

$1gram = \: {10}^{ - 3} kg$

so

$250 \times {10}^{ - 3} = 2.5 \times {10}^{ - 1} kg$

again there is no correct answer