A rocket is launched with an initial upward velocity of 320 feet per second from an initial height of 15 feet. The function h (t) = -1672 + 320t + 15 models the height of the rocket, in feet, t seconds after it was launched. For how many seconds is the height of the rocket greater than or equal to 1.039 feet?
Please answer truthfully guaranteed to the right answer.

What’s the equation you are trying to solve to get x?

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.