Question

please answer these questions
I will mark you as brainlist
plz answer fast
it's very urgent​

Answer 1

Answer:

a

Step-by-step explanation:

this are the answers of a and b now mark me as brainlliest

Answer 2

HERE IS YOUR ANSWER ..

i ) 0.000000564

=5.64×10-⁷

ii) 0.0000021

=2.1×10-⁶

iii) 21600000

=2.16×10⁷

iv)15240000

=1.524×10⁷