Question

Which shows the expression below simplified? 0.0063 - (4.2 × 10^-4)

Answer 1

a. 5.88 × 10^-3
b. 4.1937 × 10^-4
c. 5.88 × 10^-4
d. 2.1 × 10^-3

Answer 2

plug it into your calculator! 4.2x10^-4=0.00042

Answer 3

? that's not an answer choice.

Answer 4

0.0063-0.00042= YOUR ANSWER...

Answer 5

the correct answer is a.

Answer 6

thanks! i think i get now. kinda.

Answer 7

that's cool, x10^n is just a notation for 'converting' decimal points, if n is negative then it means you take the decimal point away to the left from the number, if n is positive then you are putting 0s at the right end of the number.(if this confuses you, don't worry about it!)