## Answers by Patrick T.

If s + 9 > 24, then you subtract 9 from both sides. You keep the inequality sign facing the same direction. So: s + 9 > 24 => s > 15.

A slope is a measurement of a change in f(x) over the change in x. f(x+x) - f(x) = 32 tells you two things. First it tells you that the change in x is 4, which is pretty straight forward. The difference between x and x+4 is 4. Secondly, it tells you that the change in f(x) between x and...

You have to multiply the first term, -2x, by each of the terms within the parentheses. So it will look like this: -2x*3 - -2x*x, and then you clean it up to: -6x +2x^2 (That's x squared). Notice that the sign in the middle changed because you are subtracting a negative term, which is the...

The first step to answering this question is to find the slope of the first line. To do that, we need to put it in slope-intercept form. -7x - 4y = -4  =>  -4y = 7x - 4 => y = (-7/4)x + 1. So the slope of this line is -7/4. Perpendicular lines have a negative reciprocal...