What is the d value of the following sequence 4.3, 5.6, 6.9, 8.2

You subtract C from B to get 1.3 then you add 1.3 to 8.2 and get 9.5 as your answer.

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.