Calculate the following and report using the correct number of significant figures and scientific notation: 1020 x 4.388e18 *

Answer 1

1020 can be written as 1.020x10³

We now have 1.020x10³ x 4.388x10¹⁸

Multiplying 1.020 by 4.388 we get 4.47576

Adding the exponents we get 3 + 18 = 21

This gives us a value of 4.47576x10²¹

Correcting for significant figures we end up with 4.48x10²¹ (3 sig. fig. because 1020 has only 3 s.f.)