Which of the following is equivalent to 7x10-5? (1) 700,000
(3) 70,000
(2) 0.000007
(4) 0.00007

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.

12+3b -1=-5-b -12-1+5=-b-3b -8=-4b