26.3 x 10^3 + 4x10^3
= 26.3+4=
=30.3x10^3
4.67x10^4 + 323x10^3
= 4.993x10^4
3.7x10^13 - 2.9x10^11
so we change it to .29x10^12 but what else do u do so exponents are the same?
1st two are ok
2.9x10^11 = 0.029x10^13
Now you can add them to get
3.729 x 10^13
0.0012x10^-13 - 1.5x10^-10
is it 1.2x10^-9
3.7x10^3 x 2.9x10^2
=1.073x10^4
Dimensional Analysis
8.9x10^5 tons=_____ kg
i need to show my work but I don't understand where to start.
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