The distance d, in meters, that the object travels is given by the equation d t^2 + 7t, where t is in seconds. According to this equation, how long will
it take the object to travel 30 meters? *

The correct answer is -4

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.