x = 4/5 = 0.8
y = (4/x * x) + √x + 0.2 - 5x.
First, let's plug 0.8 in for x
y = (4/0.8 * 0.8) + √0.8 + 0.2 - 5(0.8)
(4/0.8 * 0.8) the 0.8s cancel out leaving just 4
y = 4 + √0.8 + 0.2 - 5(0.8)
5 * 0.8 = 4
y = 4 + √0.8 + 0.2 - 4
Add all the terms together
y = 1.09.
It's the vertical line going through the max/ min. Also please don't put emergency on you question, it doesn't add anything.
Okay. So the song lasts 221 seconds. 45 seconds have already beem done and 22 seconds is done in an hour. The equation would be set up like this:
45 + 22h = 221
Just by looking at the answer choices, A is already eliminated because it doesn't incorportate the 45 seconds. B does include the 45 seconds, but it subtracts, and in this case, we add time, not subtract. D is eliminated, because the h variable does not go with 45. The only equation that works is C and when you solve it, you get 8 hours. The answer is C.
Note: you solve the equation above by subtract 45 from both sides to get 176 = 22x, and dividing both sides by 22 to get x = 8.
It shows you the exact distance from each number and it's easier to find out how far apart they are.
