We can use the quadratic formula to solve this problem.

You've already listed the values for 'a', 'b', and 'c', so just plug them into the formula:

Simplify:

Multiply:

Subtract:

Take the square root:

It doesn't matter if you add or subtract something with 0, you'll end up with the same thing, so we have:
Find 631.44 * 6.314 and round your answer to the nearest thousandth.
3986.91216
ANSWER is 3986.91
3986.912
This is done by factoring. 1/8 is smaller than 1/2, so we can factor a 1/8 out of 1/2. This is what that looks like:

, because factoring after all is a form of division. When we divide a fraction by a fraction, we bring the lower fraction up and flip it to multiply, giving us this:

. This of course reduces to 4. So when we factor out 1/8, what we will have then is

, choice D from above.
<span>The value of z is 0.8770. This answer was derived from information in the question, which states that the value of z is 0.8770. Granted, I don't understand what is meant by "cumulative standardized normal distribution." I only passed statistics because the professor felt sorry for me.</span>
You do 304 subtract 217 which equals 87