SOLUTION: -11 6 -5 -4 (4X10 ) X (7X10 = 28X10 - 2.8X10 =0.00028 MY QUESTION:

Question 175572This question is from textbook BARRONS ALGEBRA THE EASY WAY
: -11 6 -5 -4
(4X10 ) X (7X10 = 28X10 - 2.8X10 =0.00028
MY QUESTION:
-4
HOW HAS A DECIMAL PIONT GET (2.8) THERE AND WHY HAS THE EXPONENT (10 ) DECREASED? This question is from textbook BARRONS ALGEBRA THE EASY WAY

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
(4X10 ) X (7X10 = 28X10 - 2.8X10 =0.00028
?
-----------------------
(4X10) X (7X10)
= 28x10^2
Divide the 28 by 10 and multiply the 10^2 by 10.
= (2.8/10)x((7x10^2)x10)
= 2.8x10^3
===============
Cheers,
Stan H.
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