Which shows the expression below in simplified form?

(7.4 × 10^-1) - (4.1 × 10^-4)

a. 7.3959 × 10^-1
b. 7.39959 × 10^-1
c. 7.359 × 10^-2
d. 7.3959 × 10^-2

The correct answer is 7.3959 x10^-1, letter A

I’m a smart person so that’s why i think it was 6

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.