Final answer:
To work out (8 x 10^-2) – (4 x 10^-4) in standard form, subtract the second expression from the first expression. Simplify each expression and then subtract, time to understand all the parts of the answer
Step-by-step explanation:
To work out (8 x 10^-2) – (4 x 10^-4) in standard form, we need to subtract the second expression from the first expression. Start by simplifying each expression:
(8 x 10^-2) = 0.08
(4 x 10^-4) = 0.0004
Subtracting the second expression from the first expression gives us:
0.08 - 0.0004 = 0.0796
To write this in standard form, we need to move the decimal point 4 places to the left, since the exponent of 10 is -4:
0.0796 = 7.96 x 10^-2
So the answer is 7.96 x 10^-2 (Option A).