Question

1.5*10power13

Answer 1

aⁿ means n a's multiplied together. For example:

5⁶ = 5*5*5*5*5*5=15625
so
1.5*10¹³
means
1.5*10*10*10*10*10*10*10*10*10*10*10*10*10
=1.5*10000000000000
=15000000000000
=15,000,000,000,000