26.3 x 10^3 + 4x10^3

Question

= 26.3+4=

=30.3x10^3

Answer 1

4.67x10^4 + 323x10^3

= 4.993x10^4

Answer 2

3.7x10^13 - 2.9x10^11

so we change it to .29x10^12 but what else do u do so exponents are the same?

Answer 3

1st two are ok

2.9x10^11 = 0.029x10^13

Now you can add them to get

3.729 x 10^13

Answer 4

0.0012x10^-13 - 1.5x10^-10

is it 1.2x10^-9

Answer 5

3.7x10^3 x 2.9x10^2

=1.073x10^4

Answer 6

Dimensional Analysis

8.9x10^5 tons=_____ kg

i need to show my work but I don't understand where to start.

Answer 7

you need to remember that you can always multiply by 1 without changing anything. The trick is to make sure that the units cancel correctly

1 ton = 2000lb
that means that

1ton/2000lb = 2000lb/1ton = 1

8.9*10^5ton * 2000lb/ton * 1kg/2.204lb = 8076*10^5kg
or,
8.076*10^8kg

or,you could have looked up the conversion factor

907.185kg/ton

making the calculation in one step:

8.9*10^5ton * 907.185kg/ton = 8076*10^5kg