An expression is shown 7×3×103 p.s the three is in the top of the ten) what is the value of the expression

2.1×10^4

Step-by-step explanation:

7×3×10^3

First you multiply 7×3 = 21

Then add the rest 21×10^3

Then simplify 2.1×10^4

You can check this since:

7×3000 = 21000

When simplified

2.1×10^4

20

Step-by-step explanation:6.4 × 10-8=56

                                           4.8 × 10-12=36

                                                              -

                                                                 20 times larger